mirror of
https://github.com/boostorg/functional.git
synced 2025-07-31 13:07:18 +02:00
Fully merge all of functional (including sublibs).
Should be just documentation and metadata changes. There might be a problem witht he generated documentation for overloaded_function, if so I'll fix it very soon. [SVN r84625]
This commit is contained in:
Daniel James
@@ -23,15 +23,17 @@
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[def __boost_function__ [@http://www.boost.org/doc/html/function.html Boost.Function]]
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[def __boost__function__ [@http://www.boost.org/doc/html/function.html `boost::function`]]
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[def __smart_pointer__ [@http://www.boost.org/libs/smart_ptr/index.html Smart Pointer]]
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[def __smart_pointers__ [@http://www.boost.org/libs/smart_ptr/index.html Smart Pointers]]
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[def __boost__shared_ptr__ [@http://www.boost.org/libs/smart_ptr/shared_ptr.htm `boost::shared_ptr`]]
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[def __std__map__ [@http://www.sgi.com/tech/stl/map.html `std::map`]]
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[def __std__string__ [@http://www.sgi.com/tech/stl/string.html `std::string`]]
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[def __allocator__ [@http://www.sgi.com/tech/stl/concepts/allocator.html Allocator]]
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[def __std_allocator__ [@http://www.sgi.com/tech/stl/concepts/allocator.html Allocator]]
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[def __std_allocators__ [@http://www.sgi.com/tech/stl/concepts/allocator.html Allocators]]
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[def __boost__ptr_map__ [@http://www.boost.org/libs/ptr_container/doc/ptr_map.html `__boost__ptr_map__`]]
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[def __boost__ptr_map__ [@http://www.boost.org/libs/ptr_container/doc/ptr_map.html `boost::ptr_map`]]
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[def __boost__factory__ `boost::factory`]
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[def __boost__value_factory__ `boost::value_factory`]
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@@ -107,7 +109,7 @@ interfaces.
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// [...]
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std::auto_ptr<an_abstract_factory> x = factories[some_name]->create();
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std::auto_ptr<an_abstract_class> x(factories.at(some_name).create());
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// [...]
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}
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@@ -117,30 +119,30 @@ lots of boilerplate code. In other words there is too much code to express
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a rather simple intention. We could use templates to get rid of some of it
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but the approach remains inflexible:
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o We may want a factory that takes some arguments that are forwarded to
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the constructor,
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o we will probably want to use smart pointers,
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o we may want several member functions to create different kinds of
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objects,
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o we might not necessarily need a polymorphic base class for the objects,
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o as we will see, we do not need a factory base class at all,
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o we might want to just call the constructor - without `new` to create
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an object on the stack, and
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o finally we might want to use customized memory management.
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* We may want a factory that takes some arguments that are forwarded to
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the constructor,
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* we will probably want to use smart pointers,
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* we may want several member functions to create different kinds of
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objects,
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* we might not necessarily need a polymorphic base class for the objects,
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* as we will see, we do not need a factory base class at all,
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* we might want to just call the constructor - without `new` to create
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an object on the stack, and
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* finally we might want to use customized memory management.
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Experience has shown that using function objects and generic Boost components
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for their composition, Design Patterns that describe callback mechasisms
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for their composition, Design Patterns that describe callback mechanisms
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(typically requiring a high percentage of boilerplate code with pure Object
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Oriented methodology) become implementable with just few code lines and without
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extra classes.
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Factories are callback mechanisms for constructors, so we provide two class
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templates, __boost__value_factory__ and __boost__factory__, that encasulate
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templates, __boost__value_factory__ and __boost__factory__, that encapsulate
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object construction via direct application of the constructor and the `new`
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operator, respectively.
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We let the function objects forward their arguments to the construction
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expressions they encapsulate. Overthis __boost__factory__ optionally allows
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expressions they encapsulate. Over this __boost__factory__ optionally allows
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the use of smart pointers and __std_allocators__.
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Compile-time polymorphism can be used where appropriate,
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@@ -156,7 +158,7 @@ Compile-time polymorphism can be used where appropriate,
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// [...]
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}
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Now, to allow inhomogenous signaturs for the constructors of the types passed
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Now, to allow inhomogeneous signatures for the constructors of the types passed
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in for `T` we can use __value_factory__ and __boost__bind__ to normalize between
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them.
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@@ -299,7 +301,7 @@ constructor, such as __boost__shared_ptr__).
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If a third template argument is `factory_passes_alloc_to_smart_pointer`,
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the allocator itself is used for the third constructor argument of `Pointer`
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(__boost__shared_ptr__ then uses the allocator to manage the memory of its
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seperately allocated reference counter).
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separately allocated reference counter).
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[heading Header]
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#include <boost/functional/factory.hpp>
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@@ -1,528 +0,0 @@
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/*=============================================================================
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Copyright (c) 2004 Joel de Guzman
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http://spirit.sourceforge.net/
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Use, modification and distribution is subject to the Boost Software
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License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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/*=============================================================================
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Body defaults
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=============================================================================*/
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body
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{
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margin: 1em;
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font-family: sans-serif;
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}
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/*=============================================================================
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Paragraphs
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=============================================================================*/
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p
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{
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text-align: left;
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font-size: 10pt;
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line-height: 1.15;
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}
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/*=============================================================================
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Program listings
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=============================================================================*/
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/* Code on paragraphs */
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p tt.computeroutput
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{
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font-size: 9pt;
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}
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pre.synopsis
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{
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font-size: 90%;
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margin: 1pc 4% 0pc 4%;
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padding: 0.5pc 0.5pc 0.5pc 0.5pc;
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}
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.programlisting,
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.screen
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{
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font-size: 9pt;
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display: block;
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margin: 1pc 4% 0pc 4%;
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padding: 0.5pc 0.5pc 0.5pc 0.5pc;
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}
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/* Program listings in tables don't get borders */
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td .programlisting,
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td .screen
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{
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margin: 0pc 0pc 0pc 0pc;
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padding: 0pc 0pc 0pc 0pc;
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}
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/*=============================================================================
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Headings
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=============================================================================*/
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h1, h2, h3, h4, h5, h6
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{
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text-align: left;
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margin: 1em 0em 0.5em 0em;
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font-weight: bold;
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}
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h1 { font: 140% }
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h2 { font: bold 140% }
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h3 { font: bold 130% }
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h4 { font: bold 120% }
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h5 { font: italic 110% }
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h6 { font: italic 100% }
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/* Top page titles */
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title,
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h1.title,
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h2.title
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h3.title,
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h4.title,
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h5.title,
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h6.title,
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.refentrytitle
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{
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font-weight: bold;
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margin-bottom: 1pc;
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}
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h1.title { font-size: 140% }
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h2.title { font-size: 140% }
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h3.title { font-size: 130% }
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h4.title { font-size: 120% }
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h5.title { font-size: 110% }
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h6.title { font-size: 100% }
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.section h1
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{
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margin: 0em 0em 0.5em 0em;
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font-size: 140%;
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}
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.section h2 { font-size: 140% }
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.section h3 { font-size: 130% }
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.section h4 { font-size: 120% }
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.section h5 { font-size: 110% }
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.section h6 { font-size: 100% }
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/* Code on titles */
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h1 tt.computeroutput { font-size: 140% }
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h2 tt.computeroutput { font-size: 140% }
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h3 tt.computeroutput { font-size: 130% }
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h4 tt.computeroutput { font-size: 120% }
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h5 tt.computeroutput { font-size: 110% }
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h6 tt.computeroutput { font-size: 100% }
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/*=============================================================================
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Author
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=============================================================================*/
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h3.author
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{
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font-size: 100%
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}
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/*=============================================================================
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Lists
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=============================================================================*/
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li
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{
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font-size: 10pt;
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line-height: 1.3;
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}
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/* Unordered lists */
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ul
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{
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text-align: left;
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}
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/* Ordered lists */
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ol
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{
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text-align: left;
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}
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/*=============================================================================
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Links
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=============================================================================*/
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a
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{
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text-decoration: none; /* no underline */
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}
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a:hover
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{
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text-decoration: underline;
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}
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/*=============================================================================
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Spirit style navigation
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=============================================================================*/
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.spirit-nav
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{
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text-align: right;
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}
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.spirit-nav a
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{
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color: white;
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padding-left: 0.5em;
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}
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.spirit-nav img
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{
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border-width: 0px;
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}
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/*=============================================================================
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Table of contents
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=============================================================================*/
|
||||
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.toc
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{
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||||
margin: 1pc 4% 0pc 4%;
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||||
padding: 0.1pc 1pc 0.1pc 1pc;
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font-size: 80%;
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line-height: 1.15;
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}
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|
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.boost-toc
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||||
{
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||||
float: right;
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||||
padding: 0.5pc;
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}
|
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|
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/*=============================================================================
|
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Tables
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=============================================================================*/
|
||||
|
||||
.table-title,
|
||||
div.table p.title
|
||||
{
|
||||
margin-left: 4%;
|
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padding-right: 0.5em;
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padding-left: 0.5em;
|
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}
|
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.informaltable table,
|
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.table table
|
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{
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||||
width: 92%;
|
||||
margin-left: 4%;
|
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margin-right: 4%;
|
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}
|
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|
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div.informaltable table,
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div.table table
|
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{
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padding: 4px;
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}
|
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|
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/* Table Cells */
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div.informaltable table tr td,
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div.table table tr td
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{
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padding: 0.5em;
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text-align: left;
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font-size: 9pt;
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}
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div.informaltable table tr th,
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div.table table tr th
|
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{
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padding: 0.5em 0.5em 0.5em 0.5em;
|
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border: 1pt solid white;
|
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font-size: 80%;
|
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}
|
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/*=============================================================================
|
||||
Blurbs
|
||||
=============================================================================*/
|
||||
|
||||
div.note,
|
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div.tip,
|
||||
div.important,
|
||||
div.caution,
|
||||
div.warning,
|
||||
div.sidebar
|
||||
{
|
||||
font-size: 9pt; /* A little bit smaller than the main text */
|
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line-height: 1.2;
|
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display: block;
|
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margin: 1pc 4% 0pc 4%;
|
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padding: 0.5pc 0.5pc 0.0pc 0.5pc;
|
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}
|
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|
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div.sidebar img
|
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{
|
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padding: 1pt;
|
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}
|
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/*=============================================================================
|
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Callouts
|
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=============================================================================*/
|
||||
.line_callout_bug img
|
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{
|
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float: left;
|
||||
position:relative;
|
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left: 4px;
|
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top: -12px;
|
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clear: left;
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margin-left:-22px;
|
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}
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.callout_bug img
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{
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}
|
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/*=============================================================================
|
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Variable Lists
|
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=============================================================================*/
|
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|
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/* Make the terms in definition lists bold */
|
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div.variablelist dl dt,
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span.term
|
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{
|
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font-weight: bold;
|
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font-size: 10pt;
|
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}
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div.variablelist table tbody tr td
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{
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text-align: left;
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vertical-align: top;
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padding: 0em 2em 0em 0em;
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font-size: 10pt;
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margin: 0em 0em 0.5em 0em;
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line-height: 1;
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}
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div.variablelist dl dt
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{
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margin-bottom: 0.2em;
|
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}
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div.variablelist dl dd
|
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{
|
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margin: 0em 0em 0.5em 2em;
|
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font-size: 10pt;
|
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}
|
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div.variablelist table tbody tr td p,
|
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div.variablelist dl dd p
|
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{
|
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margin: 0em 0em 0.5em 0em;
|
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line-height: 1;
|
||||
}
|
||||
|
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/*=============================================================================
|
||||
Misc
|
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=============================================================================*/
|
||||
|
||||
/* Title of books and articles in bibliographies */
|
||||
span.title
|
||||
{
|
||||
font-style: italic;
|
||||
}
|
||||
|
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span.underline
|
||||
{
|
||||
text-decoration: underline;
|
||||
}
|
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|
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span.strikethrough
|
||||
{
|
||||
text-decoration: line-through;
|
||||
}
|
||||
|
||||
/* Copyright, Legal Notice */
|
||||
div div.legalnotice p
|
||||
{
|
||||
text-align: left
|
||||
}
|
||||
|
||||
/*=============================================================================
|
||||
Colors
|
||||
=============================================================================*/
|
||||
|
||||
@media screen
|
||||
{
|
||||
/* Links */
|
||||
a
|
||||
{
|
||||
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|
||||
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|
||||
|
||||
a:visited
|
||||
{
|
||||
color: #9c5a9c;
|
||||
}
|
||||
|
||||
h1 a, h2 a, h3 a, h4 a, h5 a, h6 a,
|
||||
h1 a:hover, h2 a:hover, h3 a:hover, h4 a:hover, h5 a:hover, h6 a:hover,
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
|
||||
/* Syntax Highlighting */
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
.comment { color: #800000; }
|
||||
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|
||||
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|
||||
.white_bkd { background-color: #FFFFFF; }
|
||||
.dk_grey_bkd { background-color: #999999; }
|
||||
|
||||
/* Copyright, Legal Notice */
|
||||
.copyright
|
||||
{
|
||||
color: #666666;
|
||||
font-size: small;
|
||||
}
|
||||
|
||||
div div.legalnotice p
|
||||
{
|
||||
color: #666666;
|
||||
}
|
||||
|
||||
/* Program listing */
|
||||
pre.synopsis
|
||||
{
|
||||
border: 1px solid #DCDCDC;
|
||||
}
|
||||
|
||||
.programlisting,
|
||||
.screen
|
||||
{
|
||||
border: 1px solid #DCDCDC;
|
||||
}
|
||||
|
||||
td .programlisting,
|
||||
td .screen
|
||||
{
|
||||
border: 0px solid #DCDCDC;
|
||||
}
|
||||
|
||||
/* Blurbs */
|
||||
div.note,
|
||||
div.tip,
|
||||
div.important,
|
||||
div.caution,
|
||||
div.warning,
|
||||
div.sidebar
|
||||
{
|
||||
border: 1px solid #DCDCDC;
|
||||
}
|
||||
|
||||
/* Table of contents */
|
||||
.toc
|
||||
{
|
||||
border: 1px solid #DCDCDC;
|
||||
}
|
||||
|
||||
/* Tables */
|
||||
div.informaltable table tr td,
|
||||
div.table table tr td
|
||||
{
|
||||
border: 1px solid #DCDCDC;
|
||||
}
|
||||
|
||||
div.informaltable table tr th,
|
||||
div.table table tr th
|
||||
{
|
||||
background-color: #F0F0F0;
|
||||
border: 1px solid #DCDCDC;
|
||||
}
|
||||
|
||||
/* Misc */
|
||||
span.highlight
|
||||
{
|
||||
color: #00A000;
|
||||
}
|
||||
}
|
||||
|
||||
@media print
|
||||
{
|
||||
/* Links */
|
||||
a
|
||||
{
|
||||
color: black;
|
||||
}
|
||||
|
||||
a:visited
|
||||
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<div><h2 class="title">
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<a name="boost_functional_factory"></a>Chapter<EFBFBD>1.<2E>Boost.Functional/Factory 1.0</h2></div>
|
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<div><div class="author"><h3 class="author">
|
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<span class="firstname">Tobias</span> <span class="surname">Schwinger</span>
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</h3></div></div>
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<div><p class="copyright">Copyright <20> 2007, 2008 Tobias Schwinger</p></div>
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<a name="id934161"></a><p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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<div class="toc">
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<p><b>Table of Contents</b></p>
|
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<dl>
|
||||
<dt><span class="section"><a href="index.html#boost_functional_factory.brief_description">Brief Description</a></span></dt>
|
||||
<dt><span class="section"><a href="index.html#boost_functional_factory.background">Background</a></span></dt>
|
||||
<dt><span class="section"><a href="index.html#boost_functional_factory.reference"> Reference</a></span></dt>
|
||||
<dt><span class="section"><a href="index.html#boost_functional_factory.acknowledgements">Acknowledgements</a></span></dt>
|
||||
<dt><span class="section"><a href="index.html#boost_functional_factory.references">References</a></span></dt>
|
||||
</dl>
|
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</div>
|
||||
<div class="section" lang="en">
|
||||
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
|
||||
<a name="boost_functional_factory.brief_description"></a><a href="index.html#boost_functional_factory.brief_description" title="Brief Description">Brief Description</a></h2></div></div></div>
|
||||
<p>
|
||||
The template <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">factory</span></code> lets you encapsulate a <code class="computeroutput"><span class="keyword">new</span></code> expression as a function object, <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">value_factory</span></code>
|
||||
encapsulates a constructor invocation without <code class="computeroutput"><span class="keyword">new</span></code>.
|
||||
</p>
|
||||
<pre class="programlisting"><code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">factory</span></code><span class="special"><</span><span class="identifier">T</span><span class="special">*>()(</span><span class="identifier">arg1</span><span class="special">,</span><span class="identifier">arg2</span><span class="special">,</span><span class="identifier">arg3</span><span class="special">)</span>
|
||||
<span class="comment">// same as new T(arg1,arg2,arg3)
|
||||
</span>
|
||||
<code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">value_factory</span></code><span class="special"><</span><span class="identifier">T</span><span class="special">>()(</span><span class="identifier">arg1</span><span class="special">,</span><span class="identifier">arg2</span><span class="special">,</span><span class="identifier">arg3</span><span class="special">)</span>
|
||||
<span class="comment">// same as T(arg1,arg2,arg3)
|
||||
</span></pre>
|
||||
<p>
|
||||
For technical reasons the arguments to the function objects have to be LValues.
|
||||
A factory that also accepts RValues can be composed using the <a href="http://www.boost.org/libs/functional/forward/doc/index.html" target="_top"><code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">forward_adapter</span></code></a>
|
||||
or <a href="http://www.boost.org/libs/bind/bind.html" target="_top"><code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">bind</span></code></a>.
|
||||
</p>
|
||||
</div>
|
||||
<div class="section" lang="en">
|
||||
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
|
||||
<a name="boost_functional_factory.background"></a><a href="index.html#boost_functional_factory.background" title="Background">Background</a></h2></div></div></div>
|
||||
<p>
|
||||
In traditional Object Oriented Programming a Factory is an object implementing
|
||||
an interface of one or more methods that construct objects conforming to known
|
||||
interfaces.
|
||||
</p>
|
||||
<pre class="programlisting"><span class="comment">// assuming a_concrete_class and another_concrete_class are derived
|
||||
</span><span class="comment">// from an_abstract_class
|
||||
</span>
|
||||
<span class="keyword">class</span> <span class="identifier">a_factory</span>
|
||||
<span class="special">{</span>
|
||||
<span class="keyword">public</span><span class="special">:</span>
|
||||
<span class="keyword">virtual</span> <span class="identifier">an_abstract_class</span><span class="special">*</span> <span class="identifier">create</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span>
|
||||
<span class="keyword">virtual</span> <span class="special">~</span><span class="identifier">a_factory</span><span class="special">()</span> <span class="special">{</span> <span class="special">}</span>
|
||||
<span class="special">};</span>
|
||||
<head>
|
||||
<!-- Copyright (C) 2002 Douglas Gregor <doug.gregor -at- gmail.com>
|
||||
|
||||
<span class="keyword">class</span> <span class="identifier">a_concrete_factory</span> <span class="special">:</span> <span class="keyword">public</span> <span class="identifier">a_factory</span>
|
||||
<span class="special">{</span>
|
||||
<span class="keyword">public</span><span class="special">:</span>
|
||||
<span class="keyword">virtual</span> <span class="identifier">an_abstract_class</span><span class="special">*</span> <span class="identifier">create</span><span class="special">()</span> <span class="keyword">const</span>
|
||||
<span class="special">{</span>
|
||||
<span class="keyword">return</span> <span class="keyword">new</span> <span class="identifier">a_concrete_class</span><span class="special">();</span>
|
||||
<span class="special">}</span>
|
||||
<span class="special">};</span>
|
||||
|
||||
<span class="keyword">class</span> <span class="identifier">another_concrete_factory</span> <span class="special">:</span> <span class="keyword">public</span> <span class="identifier">a_factory</span>
|
||||
<span class="special">{</span>
|
||||
<span class="keyword">public</span><span class="special">:</span>
|
||||
<span class="keyword">virtual</span> <span class="identifier">an_abstract_class</span><span class="special">*</span> <span class="identifier">create</span><span class="special">()</span> <span class="keyword">const</span>
|
||||
<span class="special">{</span>
|
||||
<span class="keyword">return</span> <span class="keyword">new</span> <span class="identifier">another_concrete_class</span><span class="special">();</span>
|
||||
<span class="special">}</span>
|
||||
<span class="special">};</span>
|
||||
|
||||
<span class="comment">// [...]
|
||||
</span>
|
||||
<span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span>
|
||||
<span class="special">{</span>
|
||||
<a href="http://www.boost.org/libs/ptr_container/doc/ptr_map.html" target="_top"><code class="computeroutput"><span class="identifier">__boost__ptr_map__</span></code></a><span class="special"><</span><a href="http://www.sgi.com/tech/stl/string.html" target="_top"><code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span></code></a><span class="special">,</span><span class="identifier">a_factory</span><span class="special">></span> <span class="identifier">factories</span><span class="special">;</span>
|
||||
|
||||
<span class="comment">// [...]
|
||||
</span>
|
||||
<span class="identifier">factories</span><span class="special">.</span><span class="identifier">insert</span><span class="special">(</span><span class="string">"a_name"</span><span class="special">,</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">auto_ptr</span><span class="special"><</span><span class="identifier">a_factory</span><span class="special">>(</span>
|
||||
<span class="keyword">new</span> <span class="identifier">a_concrete_factory</span><span class="special">));</span>
|
||||
<span class="identifier">factories</span><span class="special">.</span><span class="identifier">insert</span><span class="special">(</span><span class="string">"another_name"</span><span class="special">,</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">auto_ptr</span><span class="special"><</span><span class="identifier">a_factory</span><span class="special">>(</span>
|
||||
<span class="keyword">new</span> <span class="identifier">another_concrete_factory</span><span class="special">));</span>
|
||||
|
||||
<span class="comment">// [...]
|
||||
</span>
|
||||
<span class="identifier">std</span><span class="special">::</span><span class="identifier">auto_ptr</span><span class="special"><</span><span class="identifier">an_abstract_factory</span><span class="special">></span> <span class="identifier">x</span> <span class="special">=</span> <span class="identifier">factories</span><span class="special">[</span><span class="identifier">some_name</span><span class="special">]-></span><span class="identifier">create</span><span class="special">();</span>
|
||||
|
||||
<span class="comment">// [...]
|
||||
</span><span class="special">}</span>
|
||||
</pre>
|
||||
<p>
|
||||
This approach has several drawbacks. The most obvious one is that there is
|
||||
lots of boilerplate code. In other words there is too much code to express
|
||||
a rather simple intention. We could use templates to get rid of some of it
|
||||
but the approach remains inflexible:
|
||||
</p>
|
||||
<pre class="programlisting"><span class="identifier">o</span> <span class="identifier">We</span> <span class="identifier">may</span> <span class="identifier">want</span> <span class="identifier">a</span> <span class="identifier">factory</span> <span class="identifier">that</span> <span class="identifier">takes</span> <span class="identifier">some</span> <span class="identifier">arguments</span> <span class="identifier">that</span> <span class="identifier">are</span> <span class="identifier">forwarded</span> <span class="identifier">to</span>
|
||||
<span class="identifier">the</span> <span class="identifier">constructor</span><span class="special">,</span>
|
||||
<span class="identifier">o</span> <span class="identifier">we</span> <span class="identifier">will</span> <span class="identifier">probably</span> <span class="identifier">want</span> <span class="identifier">to</span> <span class="identifier">use</span> <span class="identifier">smart</span> <span class="identifier">pointers</span><span class="special">,</span>
|
||||
<span class="identifier">o</span> <span class="identifier">we</span> <span class="identifier">may</span> <span class="identifier">want</span> <span class="identifier">several</span> <span class="identifier">member</span> <span class="identifier">functions</span> <span class="identifier">to</span> <span class="identifier">create</span> <span class="identifier">different</span> <span class="identifier">kinds</span> <span class="identifier">of</span>
|
||||
<span class="identifier">objects</span><span class="special">,</span>
|
||||
<span class="identifier">o</span> <span class="identifier">we</span> <span class="identifier">might</span> <span class="keyword">not</span> <span class="identifier">necessarily</span> <span class="identifier">need</span> <span class="identifier">a</span> <span class="identifier">polymorphic</span> <span class="identifier">base</span> <span class="keyword">class</span> <span class="keyword">for</span> <span class="identifier">the</span> <span class="identifier">objects</span><span class="special">,</span>
|
||||
<span class="identifier">o</span> <span class="identifier">as</span> <span class="identifier">we</span> <span class="identifier">will</span> <span class="identifier">see</span><span class="special">,</span> <span class="identifier">we</span> <span class="keyword">do</span> <span class="keyword">not</span> <span class="identifier">need</span> <span class="identifier">a</span> <span class="identifier">factory</span> <span class="identifier">base</span> <span class="keyword">class</span> <span class="identifier">at</span> <span class="identifier">all</span><span class="special">,</span>
|
||||
<span class="identifier">o</span> <span class="identifier">we</span> <span class="identifier">might</span> <span class="identifier">want</span> <span class="identifier">to</span> <span class="identifier">just</span> <span class="identifier">call</span> <span class="identifier">the</span> <span class="identifier">constructor</span> <span class="special">-</span> <span class="identifier">without</span> #<span class="keyword">new</span># <span class="identifier">to</span> <span class="identifier">create</span>
|
||||
<span class="identifier">an</span> <span class="identifier">object</span> <span class="identifier">on</span> <span class="identifier">the</span> <span class="identifier">stack</span><span class="special">,</span> <span class="keyword">and</span>
|
||||
<span class="identifier">o</span> <span class="identifier">finally</span> <span class="identifier">we</span> <span class="identifier">might</span> <span class="identifier">want</span> <span class="identifier">to</span> <span class="identifier">use</span> <span class="identifier">customized</span> <span class="identifier">memory</span> <span class="identifier">management</span><span class="special">.</span>
|
||||
</pre>
|
||||
<p>
|
||||
Experience has shown that using function objects and generic Boost components
|
||||
for their composition, Design Patterns that describe callback mechasisms (typically
|
||||
requiring a high percentage of boilerplate code with pure Object Oriented methodology)
|
||||
become implementable with just few code lines and without extra classes.
|
||||
</p>
|
||||
<p>
|
||||
Factories are callback mechanisms for constructors, so we provide two class
|
||||
templates, <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">value_factory</span></code> and <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">factory</span></code>,
|
||||
that encasulate object construction via direct application of the constructor
|
||||
and the <code class="computeroutput"><span class="keyword">new</span></code> operator, respectively.
|
||||
</p>
|
||||
<p>
|
||||
We let the function objects forward their arguments to the construction expressions
|
||||
they encapsulate. Overthis <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">factory</span></code>
|
||||
optionally allows the use of smart pointers and <a href="http://www.sgi.com/tech/stl/concepts/allocator.html" target="_top">Allocators</a>.
|
||||
</p>
|
||||
<p>
|
||||
Compile-time polymorphism can be used where appropriate,
|
||||
</p>
|
||||
<pre class="programlisting"><span class="keyword">template</span><span class="special"><</span> <span class="keyword">class</span> <span class="identifier">T</span> <span class="special">></span>
|
||||
<span class="keyword">void</span> <span class="identifier">do_something</span><span class="special">()</span>
|
||||
<span class="special">{</span>
|
||||
<span class="comment">// [...]
|
||||
</span> <span class="identifier">T</span> <span class="identifier">x</span> <span class="special">=</span> <span class="identifier">T</span><span class="special">(</span><span class="identifier">a</span><span class="special">,</span><span class="identifier">b</span><span class="special">);</span>
|
||||
|
||||
<span class="comment">// for conceptually similar objects x we neither need virtual
|
||||
</span> <span class="comment">// functions nor a common base class in this context.
|
||||
</span> <span class="comment">// [...]
|
||||
</span><span class="special">}</span>
|
||||
</pre>
|
||||
<p>
|
||||
Now, to allow inhomogenous signaturs for the constructors of the types passed
|
||||
in for <code class="computeroutput"><span class="identifier">T</span></code> we can use <code class="computeroutput"><span class="identifier">value_factory</span></code> and <a href="http://www.boost.org/libs/bind/bind.html" target="_top"><code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">bind</span></code></a>
|
||||
to normalize between them.
|
||||
</p>
|
||||
<pre class="programlisting"><span class="keyword">template</span><span class="special"><</span> <span class="keyword">class</span> <span class="identifier">ValueFactory</span> <span class="special">></span>
|
||||
<span class="keyword">void</span> <span class="identifier">do_something</span><span class="special">(</span><span class="identifier">ValueFactory</span> <span class="identifier">make_obj</span> <span class="special">=</span> <span class="identifier">ValueFactory</span><span class="special">())</span>
|
||||
<span class="special">{</span>
|
||||
<span class="comment">// [...]
|
||||
</span> <span class="keyword">typename</span> <span class="identifier">ValueFactory</span><span class="special">::</span><span class="identifier">result_type</span> <span class="identifier">x</span> <span class="special">=</span> <span class="identifier">make_obj</span><span class="special">(</span><span class="identifier">a</span><span class="special">,</span><span class="identifier">b</span><span class="special">);</span>
|
||||
|
||||
<span class="comment">// for conceptually similar objects x we neither need virtual
|
||||
</span> <span class="comment">// functions nor a common base class in this context.
|
||||
</span> <span class="comment">// [...]
|
||||
</span><span class="special">}</span>
|
||||
|
||||
<span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span>
|
||||
<span class="special">{</span>
|
||||
<span class="comment">// [...]
|
||||
</span>
|
||||
<span class="identifier">do_something</span><span class="special">(</span><code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">value_factory</span></code><span class="special"><</span><span class="identifier">X</span><span class="special">>());</span>
|
||||
<span class="identifier">do_something</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">bind</span><span class="special">(</span><code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">value_factory</span></code><span class="special"><</span><span class="identifier">Y</span><span class="special">>(),</span><span class="identifier">_1</span><span class="special">,</span><span class="number">5</span><span class="special">,</span><span class="identifier">_2</span><span class="special">));</span>
|
||||
<span class="comment">// construct X(a,b) and Y(a,5,b), respectively.
|
||||
</span>
|
||||
<span class="comment">// [...]
|
||||
</span><span class="special">}</span>
|
||||
</pre>
|
||||
<p>
|
||||
Maybe we want our objects to outlive the function's scope, in this case we
|
||||
have to use dynamic allocation;
|
||||
</p>
|
||||
<pre class="programlisting"><span class="keyword">template</span><span class="special"><</span> <span class="keyword">class</span> <span class="identifier">Factory</span> <span class="special">></span>
|
||||
<span class="identifier">whatever</span> <span class="identifier">do_something</span><span class="special">(</span><span class="identifier">Factory</span> <span class="identifier">new_obj</span> <span class="special">=</span> <span class="identifier">Factory</span><span class="special">())</span>
|
||||
<span class="special">{</span>
|
||||
<span class="keyword">typename</span> <span class="identifier">Factory</span><span class="special">::</span><span class="identifier">result_type</span> <span class="identifier">ptr</span> <span class="special">=</span> <span class="identifier">new_obj</span><span class="special">(</span><span class="identifier">a</span><span class="special">,</span><span class="identifier">b</span><span class="special">);</span>
|
||||
|
||||
<span class="comment">// again, no common base class or virtual functions needed,
|
||||
</span> <span class="comment">// we could enforce a polymorphic base by writing e.g.
|
||||
</span> <span class="comment">// boost::shared_ptr<base>
|
||||
</span> <span class="comment">// instead of
|
||||
</span> <span class="comment">// typename Factory::result_type
|
||||
</span> <span class="comment">// above.
|
||||
</span> <span class="comment">// Note that we are also free to have the type erasure happen
|
||||
</span> <span class="comment">// somewhere else (e.g. in the constructor of this function's
|
||||
</span> <span class="comment">// result type).
|
||||
</span>
|
||||
<span class="comment">// [...]
|
||||
</span><span class="special">}</span>
|
||||
|
||||
<span class="comment">// [... call do_something like above but with __factory__ instead
|
||||
</span><span class="comment">// of __value_factory__]
|
||||
</span></pre>
|
||||
<p>
|
||||
Although we might have created polymorphic objects in the previous example,
|
||||
we have used compile time polymorphism for the factory. If we want to erase
|
||||
the type of the factory and thus allow polymorphism at run time, we can use
|
||||
<a href="http://www.boost.org/doc/html/function.html" target="_top">Boost.Function</a>
|
||||
to do so. The first example can be rewritten as follows.
|
||||
</p>
|
||||
<pre class="programlisting"><span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">function</span><span class="special"><</span> <span class="identifier">an_abstract_class</span><span class="special">*()</span> <span class="special">></span> <span class="identifier">a_factory</span><span class="special">;</span>
|
||||
|
||||
<span class="comment">// [...]
|
||||
</span>
|
||||
<span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span>
|
||||
<span class="special">{</span>
|
||||
<a href="http://www.sgi.com/tech/stl/map.html" target="_top"><code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">map</span></code></a><span class="special"><</span><a href="http://www.sgi.com/tech/stl/string.html" target="_top"><code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span></code></a><span class="special">,</span><span class="identifier">a_factory</span><span class="special">></span> <span class="identifier">factories</span><span class="special">;</span>
|
||||
|
||||
<span class="comment">// [...]
|
||||
</span>
|
||||
<span class="identifier">factories</span><span class="special">[</span><span class="string">"a_name"</span><span class="special">]</span> <span class="special">=</span> <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">factory</span></code><span class="special"><</span><span class="identifier">a_concrete_class</span><span class="special">*>();</span>
|
||||
<span class="identifier">factories</span><span class="special">[</span><span class="string">"another_name"</span><span class="special">]</span> <span class="special">=</span>
|
||||
<code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">factory</span></code><span class="special"><</span><span class="identifier">another_concrete_class</span><span class="special">*>();</span>
|
||||
|
||||
<span class="comment">// [...]
|
||||
</span><span class="special">}</span>
|
||||
</pre>
|
||||
<p>
|
||||
Of course we can just as easy create factories that take arguments and/or return
|
||||
<a href="http://www.boost.org/libs/smart_ptr/index.html" target="_top">Smart Pointers</a>.
|
||||
</p>
|
||||
</div>
|
||||
<div class="section" lang="en">
|
||||
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
|
||||
<a name="boost_functional_factory.reference"></a><a href="index.html#boost_functional_factory.reference" title=" Reference"> Reference</a></h2></div></div></div>
|
||||
<div class="toc"><dl>
|
||||
<dt><span class="section"><a href="index.html#boost_functional_factory.reference.value_factory">value_factory</a></span></dt>
|
||||
<dt><span class="section"><a href="index.html#boost_functional_factory.reference.factory">factory</a></span></dt>
|
||||
</dl></div>
|
||||
<div class="section" lang="en">
|
||||
<div class="titlepage"><div><div><h3 class="title">
|
||||
<a name="boost_functional_factory.reference.value_factory"></a><a href="index.html#boost_functional_factory.reference.value_factory" title="value_factory">value_factory</a></h3></div></div></div>
|
||||
<a name="boost_functional_factory.reference.value_factory.description"></a><h4>
|
||||
<a name="id936876"></a>
|
||||
<a href="index.html#boost_functional_factory.reference.value_factory.description">Description</a>
|
||||
</h4>
|
||||
<p>
|
||||
Function object template that invokes the constructor of the type <code class="computeroutput"><span class="identifier">T</span></code>.
|
||||
</p>
|
||||
<a name="boost_functional_factory.reference.value_factory.header"></a><h4>
|
||||
<a name="id936914"></a>
|
||||
<a href="index.html#boost_functional_factory.reference.value_factory.header">Header</a>
|
||||
</h4>
|
||||
<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">functional</span><span class="special">/</span><span class="identifier">value_factory</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
|
||||
</pre>
|
||||
<a name="boost_functional_factory.reference.value_factory.synopsis"></a><h4>
|
||||
<a name="id936989"></a>
|
||||
<a href="index.html#boost_functional_factory.reference.value_factory.synopsis">Synopsis</a>
|
||||
</h4>
|
||||
<pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span>
|
||||
<span class="special">{</span>
|
||||
<span class="keyword">template</span><span class="special"><</span> <span class="keyword">typename</span> <span class="identifier">T</span> <span class="special">></span>
|
||||
<span class="keyword">class</span> <span class="identifier">value_factory</span><span class="special">;</span>
|
||||
<span class="special">}</span>
|
||||
</pre>
|
||||
<div class="variablelist">
|
||||
<p class="title"><b>Notation</b></p>
|
||||
<dl>
|
||||
<dt><span class="term"><code class="computeroutput"><span class="identifier">T</span></code></span></dt>
|
||||
<dd><p>
|
||||
an arbitrary type with at least one public constructor
|
||||
</p></dd>
|
||||
<dt><span class="term"><code class="computeroutput"><span class="identifier">a0</span></code>...<code class="computeroutput"><span class="identifier">aN</span></code></span></dt>
|
||||
<dd><p>
|
||||
argument LValues to a constructor of <code class="computeroutput"><span class="identifier">T</span></code>
|
||||
</p></dd>
|
||||
<dt><span class="term"><code class="computeroutput"><span class="identifier">F</span></code></span></dt>
|
||||
<dd><p>
|
||||
the type <code class="computeroutput"><span class="identifier">value_factory</span><span class="special"><</span><span class="identifier">F</span><span class="special">></span></code>
|
||||
</p></dd>
|
||||
<dt><span class="term"><code class="computeroutput"><span class="identifier">f</span></code></span></dt>
|
||||
<dd><p>
|
||||
an instance object of <code class="computeroutput"><span class="identifier">F</span></code>
|
||||
</p></dd>
|
||||
</dl>
|
||||
</div>
|
||||
<a name="boost_functional_factory.reference.value_factory.expression_semantics"></a><h4>
|
||||
<a name="id937226"></a>
|
||||
<a href="index.html#boost_functional_factory.reference.value_factory.expression_semantics">Expression
|
||||
Semantics</a>
|
||||
</h4>
|
||||
<div class="informaltable"><table class="table">
|
||||
<colgroup>
|
||||
<col>
|
||||
<col>
|
||||
</colgroup>
|
||||
<thead><tr>
|
||||
<th>
|
||||
<p>
|
||||
Expression
|
||||
</p>
|
||||
</th>
|
||||
<th>
|
||||
<p>
|
||||
Semantics
|
||||
</p>
|
||||
</th>
|
||||
</tr></thead>
|
||||
<tbody>
|
||||
<tr>
|
||||
<td>
|
||||
<p>
|
||||
<code class="computeroutput"><span class="identifier">F</span><span class="special">()</span></code>
|
||||
</p>
|
||||
</td>
|
||||
<td>
|
||||
<p>
|
||||
creates an object of type <code class="computeroutput"><span class="identifier">F</span></code>.
|
||||
</p>
|
||||
</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>
|
||||
<p>
|
||||
<code class="computeroutput"><span class="identifier">F</span><span class="special">(</span><span class="identifier">f</span><span class="special">)</span></code>
|
||||
</p>
|
||||
</td>
|
||||
<td>
|
||||
<p>
|
||||
creates an object of type <code class="computeroutput"><span class="identifier">F</span></code>.
|
||||
</p>
|
||||
</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>
|
||||
<p>
|
||||
<code class="computeroutput"><span class="identifier">f</span><span class="special">(</span><span class="identifier">a0</span></code>...<code class="computeroutput"><span class="identifier">aN</span><span class="special">)</span></code>
|
||||
</p>
|
||||
</td>
|
||||
<td>
|
||||
<p>
|
||||
returns <code class="computeroutput"><span class="identifier">T</span><span class="special">(</span><span class="identifier">a0</span></code>...<code class="computeroutput"><span class="identifier">aN</span><span class="special">)</span></code>.
|
||||
</p>
|
||||
</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>
|
||||
<p>
|
||||
<code class="computeroutput"><span class="identifier">F</span><span class="special">::</span><span class="identifier">result_type</span></code>
|
||||
</p>
|
||||
</td>
|
||||
<td>
|
||||
<p>
|
||||
is the type <code class="computeroutput"><span class="identifier">T</span></code>.
|
||||
</p>
|
||||
</td>
|
||||
</tr>
|
||||
</tbody>
|
||||
</table></div>
|
||||
<a name="boost_functional_factory.reference.value_factory.limits"></a><h4>
|
||||
<a name="id937498"></a>
|
||||
<a href="index.html#boost_functional_factory.reference.value_factory.limits">Limits</a>
|
||||
</h4>
|
||||
<p>
|
||||
The macro BOOST_FUNCTIONAL_VALUE_FACTORY_MAX_ARITY can be defined to set
|
||||
the maximum arity. It defaults to 10.
|
||||
</p>
|
||||
</div>
|
||||
<div class="section" lang="en">
|
||||
<div class="titlepage"><div><div><h3 class="title">
|
||||
<a name="boost_functional_factory.reference.factory"></a><a href="index.html#boost_functional_factory.reference.factory" title="factory">factory</a></h3></div></div></div>
|
||||
<a name="boost_functional_factory.reference.factory.description"></a><h4>
|
||||
<a name="id937545"></a>
|
||||
<a href="index.html#boost_functional_factory.reference.factory.description">Description</a>
|
||||
</h4>
|
||||
<p>
|
||||
Function object template that dynamically constructs a pointee object for
|
||||
the type of pointer given as template argument. Smart pointers may be used
|
||||
for the template argument, given that <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">pointee</span><span class="special"><</span><span class="identifier">Pointer</span><span class="special">>::</span><span class="identifier">type</span></code>
|
||||
yields the pointee type.
|
||||
</p>
|
||||
<p>
|
||||
If an <span class="underline">_allocator</span>_ is given, it is used
|
||||
for memory allocation and the placement form of the <code class="computeroutput"><span class="keyword">new</span></code>
|
||||
operator is used to construct the object. A function object that calls the
|
||||
destructor and deallocates the memory with a copy of the Allocator is used
|
||||
for the second constructor argument of <code class="computeroutput"><span class="identifier">Pointer</span></code>
|
||||
(thus it must be a __smart<span class="underline">pointer</span>_
|
||||
that provides a suitable constructor, such as <a href="http://www.boost.org/libs/smart_ptr/shared_ptr.htm" target="_top"><code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">shared_ptr</span></code></a>).
|
||||
</p>
|
||||
<p>
|
||||
If a third template argument is <code class="computeroutput"><span class="identifier">factory_passes_alloc_to_smart_pointer</span></code>,
|
||||
the allocator itself is used for the third constructor argument of <code class="computeroutput"><span class="identifier">Pointer</span></code> (<a href="http://www.boost.org/libs/smart_ptr/shared_ptr.htm" target="_top"><code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">shared_ptr</span></code></a> then uses the allocator
|
||||
to manage the memory of its seperately allocated reference counter).
|
||||
</p>
|
||||
<a name="boost_functional_factory.reference.factory.header"></a><h4>
|
||||
<a name="id937729"></a>
|
||||
<a href="index.html#boost_functional_factory.reference.factory.header">Header</a>
|
||||
</h4>
|
||||
<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">functional</span><span class="special">/</span><span class="identifier">factory</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
|
||||
</pre>
|
||||
<a name="boost_functional_factory.reference.factory.synopsis"></a><h4>
|
||||
<a name="id937804"></a>
|
||||
<a href="index.html#boost_functional_factory.reference.factory.synopsis">Synopsis</a>
|
||||
</h4>
|
||||
<pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span>
|
||||
<span class="special">{</span>
|
||||
<span class="keyword">enum</span> <span class="identifier">factory_alloc_propagation</span>
|
||||
<span class="special">{</span>
|
||||
<span class="identifier">factory_alloc_for_pointee_and_deleter</span><span class="special">,</span>
|
||||
<span class="identifier">factory_passes_alloc_to_smart_pointer</span>
|
||||
<span class="special">};</span>
|
||||
|
||||
<span class="keyword">template</span><span class="special"><</span> <span class="keyword">typename</span> <span class="identifier">Pointer</span><span class="special">,</span>
|
||||
<span class="keyword">class</span> <span class="identifier">Allocator</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">none_t</span><span class="special">,</span>
|
||||
<span class="identifier">factory_alloc_propagation</span> <span class="identifier">AllocProp</span> <span class="special">=</span>
|
||||
<span class="identifier">factory_alloc_for_pointee_and_deleter</span> <span class="special">></span>
|
||||
<span class="keyword">class</span> <span class="identifier">factory</span><span class="special">;</span>
|
||||
<span class="special">}</span>
|
||||
</pre>
|
||||
<div class="variablelist">
|
||||
<p class="title"><b>Notation</b></p>
|
||||
<dl>
|
||||
<dt><span class="term"><code class="computeroutput"><span class="identifier">T</span></code></span></dt>
|
||||
<dd><p>
|
||||
an arbitrary type with at least one public constructor
|
||||
</p></dd>
|
||||
<dt><span class="term"><code class="computeroutput"><span class="identifier">P</span></code></span></dt>
|
||||
<dd><p>
|
||||
pointer or smart pointer to <code class="computeroutput"><span class="identifier">T</span></code>
|
||||
</p></dd>
|
||||
<dt><span class="term"><code class="computeroutput"><span class="identifier">a0</span></code>...<code class="computeroutput"><span class="identifier">aN</span></code></span></dt>
|
||||
<dd><p>
|
||||
argument LValues to a constructor of <code class="computeroutput"><span class="identifier">T</span></code>
|
||||
</p></dd>
|
||||
<dt><span class="term"><code class="computeroutput"><span class="identifier">F</span></code></span></dt>
|
||||
<dd><p>
|
||||
the type <code class="computeroutput"><span class="identifier">factory</span><span class="special"><</span><span class="identifier">P</span><span class="special">></span></code>
|
||||
</p></dd>
|
||||
<dt><span class="term"><code class="computeroutput"><span class="identifier">f</span></code></span></dt>
|
||||
<dd><p>
|
||||
an instance object of <code class="computeroutput"><span class="identifier">F</span></code>
|
||||
</p></dd>
|
||||
</dl>
|
||||
</div>
|
||||
<a name="boost_functional_factory.reference.factory.expression_semantics"></a><h4>
|
||||
<a name="id938169"></a>
|
||||
<a href="index.html#boost_functional_factory.reference.factory.expression_semantics">Expression
|
||||
Semantics</a>
|
||||
</h4>
|
||||
<div class="informaltable"><table class="table">
|
||||
<colgroup>
|
||||
<col>
|
||||
<col>
|
||||
</colgroup>
|
||||
<thead><tr>
|
||||
<th>
|
||||
<p>
|
||||
Expression
|
||||
</p>
|
||||
</th>
|
||||
<th>
|
||||
<p>
|
||||
Semantics
|
||||
</p>
|
||||
</th>
|
||||
</tr></thead>
|
||||
<tbody>
|
||||
<tr>
|
||||
<td>
|
||||
<p>
|
||||
<code class="computeroutput"><span class="identifier">F</span><span class="special">()</span></code>
|
||||
</p>
|
||||
</td>
|
||||
<td>
|
||||
<p>
|
||||
creates an object of type <code class="computeroutput"><span class="identifier">F</span></code>.
|
||||
</p>
|
||||
</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>
|
||||
<p>
|
||||
<code class="computeroutput"><span class="identifier">F</span><span class="special">(</span><span class="identifier">f</span><span class="special">)</span></code>
|
||||
</p>
|
||||
</td>
|
||||
<td>
|
||||
<p>
|
||||
creates an object of type <code class="computeroutput"><span class="identifier">F</span></code>.
|
||||
</p>
|
||||
</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>
|
||||
<p>
|
||||
<code class="computeroutput"><span class="identifier">f</span><span class="special">(</span><span class="identifier">a0</span></code>...<code class="computeroutput"><span class="identifier">aN</span><span class="special">)</span></code>
|
||||
</p>
|
||||
</td>
|
||||
<td>
|
||||
<p>
|
||||
dynamically creates an object of type <code class="computeroutput"><span class="identifier">T</span></code>
|
||||
using <code class="computeroutput"><span class="identifier">a0</span></code>...<code class="computeroutput"><span class="identifier">aN</span></code> as arguments for the constructor
|
||||
invocation.
|
||||
</p>
|
||||
</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>
|
||||
<p>
|
||||
<code class="computeroutput"><span class="identifier">F</span><span class="special">::</span><span class="identifier">result_type</span></code>
|
||||
</p>
|
||||
</td>
|
||||
<td>
|
||||
<p>
|
||||
is the type <code class="computeroutput"><span class="identifier">P</span></code> with
|
||||
top-level cv-qualifiers removed.
|
||||
</p>
|
||||
</td>
|
||||
</tr>
|
||||
</tbody>
|
||||
</table></div>
|
||||
<a name="boost_functional_factory.reference.factory.limits"></a><h4>
|
||||
<a name="id938440"></a>
|
||||
<a href="index.html#boost_functional_factory.reference.factory.limits">Limits</a>
|
||||
</h4>
|
||||
<p>
|
||||
The macro BOOST_FUNCTIONAL_FACTORY_MAX_ARITY can be defined to set the maximum
|
||||
arity. It defaults to 10.
|
||||
</p>
|
||||
</div>
|
||||
</div>
|
||||
<div class="section" lang="en">
|
||||
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
|
||||
<a name="boost_functional_factory.acknowledgements"></a><a href="index.html#boost_functional_factory.acknowledgements" title="Acknowledgements">Acknowledgements</a></h2></div></div></div>
|
||||
<p>
|
||||
Eric Niebler requested a function to invoke a type's constructor (with the
|
||||
arguments supplied as a Tuple) as a Fusion feature. These Factory utilities
|
||||
are a factored-out generalization of this idea.
|
||||
</p>
|
||||
<p>
|
||||
Dave Abrahams suggested Smart Pointer support for exception safety, providing
|
||||
useful hints for the implementation.
|
||||
</p>
|
||||
<p>
|
||||
Joel de Guzman's documentation style was copied from Fusion.
|
||||
</p>
|
||||
<p>
|
||||
Further, I want to thank Peter Dimov for sharing his insights on language details
|
||||
and their evolution.
|
||||
</p>
|
||||
</div>
|
||||
<div class="section" lang="en">
|
||||
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
|
||||
<a name="boost_functional_factory.references"></a><a href="index.html#boost_functional_factory.references" title="References">References</a></h2></div></div></div>
|
||||
<div class="orderedlist"><ol type="1">
|
||||
<li>
|
||||
<a href="http://en.wikipedia.org/wiki/Design_Patterns" target="_top">Design Patterns</a>,
|
||||
Gamma et al. - Addison Wesley Publishing, 1995
|
||||
</li>
|
||||
<li>
|
||||
<a href="http://www.sgi.com/tech/stl/" target="_top">Standard Template Library Programmer's
|
||||
Guide</a>, Hewlett-Packard Company, 1994
|
||||
</li>
|
||||
<li>
|
||||
<a href="http://www.boost.org/libs/bind/bind.html" target="_top">Boost.Bind</a>,
|
||||
Peter Dimov, 2001-2005
|
||||
</li>
|
||||
<li>
|
||||
<a href="http://www.boost.org/doc/html/function.html" target="_top">Boost.Function</a>,
|
||||
Douglas Gregor, 2001-2004
|
||||
</li>
|
||||
</ol></div>
|
||||
</div>
|
||||
</div>
|
||||
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
|
||||
<td align="left"><p><small>Last revised: November 01, 2008 at 21:44:52 GMT</small></p></td>
|
||||
<td align="right"><div class="copyright-footer"></div></td>
|
||||
</tr></table>
|
||||
<hr>
|
||||
<div class="spirit-nav"></div>
|
||||
</body>
|
||||
Distributed under the Boost Software License, Version 1.0.
|
||||
(See accompanying file LICENSE_1_0.txt or copy at
|
||||
http://www.boost.org/LICENSE_1_0.txt) -->
|
||||
<title>Redirect to generated documentation</title>
|
||||
<meta http-equiv="refresh" content="0; URL=http://boost-sandbox.sourceforge.net/libs/functional/factory/doc/html/">
|
||||
</head>
|
||||
<body>
|
||||
Automatic redirection failed, please go to
|
||||
<a href="http://boost-sandbox.sourceforge.net/libs/functional/factory/doc/html/">http://boost-sandbox.sourceforge.net/libs/functional/factory/doc/html/</a>
|
||||
</body>
|
||||
</html>
|
||||
|
||||
@@ -1,528 +0,0 @@
|
||||
/*=============================================================================
|
||||
Copyright (c) 2004 Joel de Guzman
|
||||
http://spirit.sourceforge.net/
|
||||
|
||||
Use, modification and distribution is subject to the Boost Software
|
||||
License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
|
||||
http://www.boost.org/LICENSE_1_0.txt)
|
||||
=============================================================================*/
|
||||
|
||||
/*=============================================================================
|
||||
Body defaults
|
||||
=============================================================================*/
|
||||
|
||||
body
|
||||
{
|
||||
margin: 1em;
|
||||
font-family: sans-serif;
|
||||
}
|
||||
|
||||
/*=============================================================================
|
||||
Paragraphs
|
||||
=============================================================================*/
|
||||
|
||||
p
|
||||
{
|
||||
text-align: left;
|
||||
font-size: 10pt;
|
||||
line-height: 1.15;
|
||||
}
|
||||
|
||||
/*=============================================================================
|
||||
Program listings
|
||||
=============================================================================*/
|
||||
|
||||
/* Code on paragraphs */
|
||||
p tt.computeroutput
|
||||
{
|
||||
font-size: 9pt;
|
||||
}
|
||||
|
||||
pre.synopsis
|
||||
{
|
||||
font-size: 90%;
|
||||
margin: 1pc 4% 0pc 4%;
|
||||
padding: 0.5pc 0.5pc 0.5pc 0.5pc;
|
||||
}
|
||||
|
||||
.programlisting,
|
||||
.screen
|
||||
{
|
||||
font-size: 9pt;
|
||||
display: block;
|
||||
margin: 1pc 4% 0pc 4%;
|
||||
padding: 0.5pc 0.5pc 0.5pc 0.5pc;
|
||||
}
|
||||
|
||||
/* Program listings in tables don't get borders */
|
||||
td .programlisting,
|
||||
td .screen
|
||||
{
|
||||
margin: 0pc 0pc 0pc 0pc;
|
||||
padding: 0pc 0pc 0pc 0pc;
|
||||
}
|
||||
|
||||
/*=============================================================================
|
||||
Headings
|
||||
=============================================================================*/
|
||||
|
||||
h1, h2, h3, h4, h5, h6
|
||||
{
|
||||
text-align: left;
|
||||
margin: 1em 0em 0.5em 0em;
|
||||
font-weight: bold;
|
||||
}
|
||||
|
||||
h1 { font: 140% }
|
||||
h2 { font: bold 140% }
|
||||
h3 { font: bold 130% }
|
||||
h4 { font: bold 120% }
|
||||
h5 { font: italic 110% }
|
||||
h6 { font: italic 100% }
|
||||
|
||||
/* Top page titles */
|
||||
title,
|
||||
h1.title,
|
||||
h2.title
|
||||
h3.title,
|
||||
h4.title,
|
||||
h5.title,
|
||||
h6.title,
|
||||
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|
||||
{
|
||||
font-weight: bold;
|
||||
margin-bottom: 1pc;
|
||||
}
|
||||
|
||||
h1.title { font-size: 140% }
|
||||
h2.title { font-size: 140% }
|
||||
h3.title { font-size: 130% }
|
||||
h4.title { font-size: 120% }
|
||||
h5.title { font-size: 110% }
|
||||
h6.title { font-size: 100% }
|
||||
|
||||
.section h1
|
||||
{
|
||||
margin: 0em 0em 0.5em 0em;
|
||||
font-size: 140%;
|
||||
}
|
||||
|
||||
.section h2 { font-size: 140% }
|
||||
.section h3 { font-size: 130% }
|
||||
.section h4 { font-size: 120% }
|
||||
.section h5 { font-size: 110% }
|
||||
.section h6 { font-size: 100% }
|
||||
|
||||
/* Code on titles */
|
||||
h1 tt.computeroutput { font-size: 140% }
|
||||
h2 tt.computeroutput { font-size: 140% }
|
||||
h3 tt.computeroutput { font-size: 130% }
|
||||
h4 tt.computeroutput { font-size: 120% }
|
||||
h5 tt.computeroutput { font-size: 110% }
|
||||
h6 tt.computeroutput { font-size: 100% }
|
||||
|
||||
/*=============================================================================
|
||||
Author
|
||||
=============================================================================*/
|
||||
|
||||
h3.author
|
||||
{
|
||||
font-size: 100%
|
||||
}
|
||||
|
||||
/*=============================================================================
|
||||
Lists
|
||||
=============================================================================*/
|
||||
|
||||
li
|
||||
{
|
||||
font-size: 10pt;
|
||||
line-height: 1.3;
|
||||
}
|
||||
|
||||
/* Unordered lists */
|
||||
ul
|
||||
{
|
||||
text-align: left;
|
||||
}
|
||||
|
||||
/* Ordered lists */
|
||||
ol
|
||||
{
|
||||
text-align: left;
|
||||
}
|
||||
|
||||
/*=============================================================================
|
||||
Links
|
||||
=============================================================================*/
|
||||
|
||||
a
|
||||
{
|
||||
text-decoration: none; /* no underline */
|
||||
}
|
||||
|
||||
a:hover
|
||||
{
|
||||
text-decoration: underline;
|
||||
}
|
||||
|
||||
/*=============================================================================
|
||||
Spirit style navigation
|
||||
=============================================================================*/
|
||||
|
||||
.spirit-nav
|
||||
{
|
||||
text-align: right;
|
||||
}
|
||||
|
||||
.spirit-nav a
|
||||
{
|
||||
color: white;
|
||||
padding-left: 0.5em;
|
||||
}
|
||||
|
||||
.spirit-nav img
|
||||
{
|
||||
border-width: 0px;
|
||||
}
|
||||
|
||||
/*=============================================================================
|
||||
Table of contents
|
||||
=============================================================================*/
|
||||
|
||||
.toc
|
||||
{
|
||||
margin: 1pc 4% 0pc 4%;
|
||||
padding: 0.1pc 1pc 0.1pc 1pc;
|
||||
font-size: 80%;
|
||||
line-height: 1.15;
|
||||
}
|
||||
|
||||
.boost-toc
|
||||
{
|
||||
float: right;
|
||||
padding: 0.5pc;
|
||||
}
|
||||
|
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/*=============================================================================
|
||||
Tables
|
||||
=============================================================================*/
|
||||
|
||||
.table-title,
|
||||
div.table p.title
|
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{
|
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margin-left: 4%;
|
||||
padding-right: 0.5em;
|
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padding-left: 0.5em;
|
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}
|
||||
|
||||
.informaltable table,
|
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.table table
|
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{
|
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width: 92%;
|
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margin-left: 4%;
|
||||
margin-right: 4%;
|
||||
}
|
||||
|
||||
div.informaltable table,
|
||||
div.table table
|
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{
|
||||
padding: 4px;
|
||||
}
|
||||
|
||||
/* Table Cells */
|
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div.informaltable table tr td,
|
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div.table table tr td
|
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{
|
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padding: 0.5em;
|
||||
text-align: left;
|
||||
font-size: 9pt;
|
||||
}
|
||||
|
||||
div.informaltable table tr th,
|
||||
div.table table tr th
|
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{
|
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padding: 0.5em 0.5em 0.5em 0.5em;
|
||||
border: 1pt solid white;
|
||||
font-size: 80%;
|
||||
}
|
||||
|
||||
/*=============================================================================
|
||||
Blurbs
|
||||
=============================================================================*/
|
||||
|
||||
div.note,
|
||||
div.tip,
|
||||
div.important,
|
||||
div.caution,
|
||||
div.warning,
|
||||
div.sidebar
|
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{
|
||||
font-size: 9pt; /* A little bit smaller than the main text */
|
||||
line-height: 1.2;
|
||||
display: block;
|
||||
margin: 1pc 4% 0pc 4%;
|
||||
padding: 0.5pc 0.5pc 0.0pc 0.5pc;
|
||||
}
|
||||
|
||||
div.sidebar img
|
||||
{
|
||||
padding: 1pt;
|
||||
}
|
||||
|
||||
/*=============================================================================
|
||||
Callouts
|
||||
=============================================================================*/
|
||||
.line_callout_bug img
|
||||
{
|
||||
float: left;
|
||||
position:relative;
|
||||
left: 4px;
|
||||
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|
||||
clear: left;
|
||||
margin-left:-22px;
|
||||
}
|
||||
|
||||
.callout_bug img
|
||||
{
|
||||
}
|
||||
|
||||
/*=============================================================================
|
||||
Variable Lists
|
||||
=============================================================================*/
|
||||
|
||||
/* Make the terms in definition lists bold */
|
||||
div.variablelist dl dt,
|
||||
span.term
|
||||
{
|
||||
font-weight: bold;
|
||||
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|
||||
}
|
||||
|
||||
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|
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
}
|
||||
|
||||
div.variablelist dl dt
|
||||
{
|
||||
margin-bottom: 0.2em;
|
||||
}
|
||||
|
||||
div.variablelist dl dd
|
||||
{
|
||||
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|
||||
font-size: 10pt;
|
||||
}
|
||||
|
||||
div.variablelist table tbody tr td p,
|
||||
div.variablelist dl dd p
|
||||
{
|
||||
margin: 0em 0em 0.5em 0em;
|
||||
line-height: 1;
|
||||
}
|
||||
|
||||
/*=============================================================================
|
||||
Misc
|
||||
=============================================================================*/
|
||||
|
||||
/* Title of books and articles in bibliographies */
|
||||
span.title
|
||||
{
|
||||
font-style: italic;
|
||||
}
|
||||
|
||||
span.underline
|
||||
{
|
||||
text-decoration: underline;
|
||||
}
|
||||
|
||||
span.strikethrough
|
||||
{
|
||||
text-decoration: line-through;
|
||||
}
|
||||
|
||||
/* Copyright, Legal Notice */
|
||||
div div.legalnotice p
|
||||
{
|
||||
text-align: left
|
||||
}
|
||||
|
||||
/*=============================================================================
|
||||
Colors
|
||||
=============================================================================*/
|
||||
|
||||
@media screen
|
||||
{
|
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/* Links */
|
||||
a
|
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{
|
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color: #005a9c;
|
||||
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|
||||
|
||||
a:visited
|
||||
{
|
||||
color: #9c5a9c;
|
||||
}
|
||||
|
||||
h1 a, h2 a, h3 a, h4 a, h5 a, h6 a,
|
||||
h1 a:hover, h2 a:hover, h3 a:hover, h4 a:hover, h5 a:hover, h6 a:hover,
|
||||
h1 a:visited, h2 a:visited, h3 a:visited, h4 a:visited, h5 a:visited, h6 a:visited
|
||||
{
|
||||
text-decoration: none; /* no underline */
|
||||
color: #000000;
|
||||
}
|
||||
|
||||
/* Syntax Highlighting */
|
||||
.keyword { color: #0000AA; }
|
||||
.identifier { color: #000000; }
|
||||
.special { color: #707070; }
|
||||
.preprocessor { color: #402080; }
|
||||
.char { color: teal; }
|
||||
.comment { color: #800000; }
|
||||
.string { color: teal; }
|
||||
.number { color: teal; }
|
||||
.white_bkd { background-color: #FFFFFF; }
|
||||
.dk_grey_bkd { background-color: #999999; }
|
||||
|
||||
/* Copyright, Legal Notice */
|
||||
.copyright
|
||||
{
|
||||
color: #666666;
|
||||
font-size: small;
|
||||
}
|
||||
|
||||
div div.legalnotice p
|
||||
{
|
||||
color: #666666;
|
||||
}
|
||||
|
||||
/* Program listing */
|
||||
pre.synopsis
|
||||
{
|
||||
border: 1px solid #DCDCDC;
|
||||
}
|
||||
|
||||
.programlisting,
|
||||
.screen
|
||||
{
|
||||
border: 1px solid #DCDCDC;
|
||||
}
|
||||
|
||||
td .programlisting,
|
||||
td .screen
|
||||
{
|
||||
border: 0px solid #DCDCDC;
|
||||
}
|
||||
|
||||
/* Blurbs */
|
||||
div.note,
|
||||
div.tip,
|
||||
div.important,
|
||||
div.caution,
|
||||
div.warning,
|
||||
div.sidebar
|
||||
{
|
||||
border: 1px solid #DCDCDC;
|
||||
}
|
||||
|
||||
/* Table of contents */
|
||||
.toc
|
||||
{
|
||||
border: 1px solid #DCDCDC;
|
||||
}
|
||||
|
||||
/* Tables */
|
||||
div.informaltable table tr td,
|
||||
div.table table tr td
|
||||
{
|
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border: 1px solid #DCDCDC;
|
||||
}
|
||||
|
||||
div.informaltable table tr th,
|
||||
div.table table tr th
|
||||
{
|
||||
background-color: #F0F0F0;
|
||||
border: 1px solid #DCDCDC;
|
||||
}
|
||||
|
||||
/* Misc */
|
||||
span.highlight
|
||||
{
|
||||
color: #00A000;
|
||||
}
|
||||
}
|
||||
|
||||
@media print
|
||||
{
|
||||
/* Links */
|
||||
a
|
||||
{
|
||||
color: black;
|
||||
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|
||||
|
||||
a:visited
|
||||
{
|
||||
color: black;
|
||||
}
|
||||
|
||||
.spirit-nav
|
||||
{
|
||||
display: none;
|
||||
}
|
||||
|
||||
/* Program listing */
|
||||
pre.synopsis
|
||||
{
|
||||
border: 1px solid gray;
|
||||
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|
||||
|
||||
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|
||||
.screen
|
||||
{
|
||||
border: 1px solid gray;
|
||||
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|
||||
|
||||
td .programlisting,
|
||||
td .screen
|
||||
{
|
||||
border: 0px solid #DCDCDC;
|
||||
}
|
||||
|
||||
/* Table of contents */
|
||||
.toc
|
||||
{
|
||||
border: 1px solid gray;
|
||||
}
|
||||
|
||||
.informaltable table,
|
||||
.table table
|
||||
{
|
||||
border: 1px solid gray;
|
||||
border-collapse: collapse;
|
||||
}
|
||||
|
||||
/* Tables */
|
||||
div.informaltable table tr td,
|
||||
div.table table tr td
|
||||
{
|
||||
border: 1px solid gray;
|
||||
}
|
||||
|
||||
div.informaltable table tr th,
|
||||
div.table table tr th
|
||||
{
|
||||
border: 1px solid gray;
|
||||
}
|
||||
|
||||
/* Misc */
|
||||
span.highlight
|
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|
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<div class="titlepage"><div>
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<div><h2 class="title">
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<a name="boost_functional_forward"></a>Chapter<EFBFBD>1.<2E>Boost.Functional/Forward 1.0</h2></div>
|
||||
<div><div class="author"><h3 class="author">
|
||||
<span class="firstname">Tobias</span> <span class="surname">Schwinger</span>
|
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</h3></div></div>
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<div><p class="copyright">Copyright <20> 2007, 2008 Tobias Schwinger</p></div>
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<div><div class="legalnotice">
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<a name="id934161"></a><p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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<div class="toc">
|
||||
<p><b>Table of Contents</b></p>
|
||||
<dl>
|
||||
<dt><span class="section"><a href="index.html#boost_functional_forward.brief_description">Brief Description</a></span></dt>
|
||||
<dt><span class="section"><a href="index.html#boost_functional_forward.background">Background</a></span></dt>
|
||||
<dt><span class="section"><a href="index.html#boost_functional_forward.reference"> Reference</a></span></dt>
|
||||
<dt><span class="section"><a href="index.html#boost_functional_forward.acknowledgements">Acknowledgements</a></span></dt>
|
||||
<dt><span class="section"><a href="index.html#boost_functional_forward.references">References</a></span></dt>
|
||||
</dl>
|
||||
</div>
|
||||
<div class="section" lang="en">
|
||||
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
|
||||
<a name="boost_functional_forward.brief_description"></a><a href="index.html#boost_functional_forward.brief_description" title="Brief Description">Brief Description</a></h2></div></div></div>
|
||||
<p>
|
||||
<code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">forward_adapter</span></code> provides a reusable adapter
|
||||
template for function objects. It forwards RValues as references to const,
|
||||
while leaving LValues as-is.
|
||||
</p>
|
||||
<pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">g</span> <span class="comment">// function object that only accept LValues
|
||||
</span><span class="special">{</span>
|
||||
<span class="keyword">template</span><span class="special"><</span> <span class="keyword">typename</span> <span class="identifier">T0</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">T1</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">T2</span> <span class="special">></span>
|
||||
<span class="keyword">void</span> <span class="keyword">operator</span><span class="special">()(</span><span class="identifier">T0</span> <span class="special">&</span> <span class="identifier">t0</span><span class="special">,</span> <span class="identifier">T1</span> <span class="special">&</span> <span class="identifier">t1</span><span class="special">,</span> <span class="identifier">T2</span> <span class="special">&</span> <span class="identifier">t2</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
|
||||
<head>
|
||||
<!-- Copyright (C) 2002 Douglas Gregor <doug.gregor -at- gmail.com>
|
||||
|
||||
<span class="keyword">typedef</span> <span class="keyword">void</span> <span class="identifier">result_type</span><span class="special">;</span>
|
||||
<span class="special">};</span>
|
||||
|
||||
<span class="comment">// Adapted version also accepts RValues and forwards
|
||||
</span><span class="comment">// them as references to const, LValues as-is
|
||||
</span><span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">forward_adapter</span><span class="special"><</span><span class="identifier">g</span><span class="special">></span> <span class="identifier">f</span><span class="special">;</span>
|
||||
</pre>
|
||||
<p>
|
||||
Another adapter, <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">lighweight_forward_adapter</span></code> allows forwarding
|
||||
with some help from the user accepting and unwrapping reference wrappers (see
|
||||
<a href="http://www.boost.org/doc/html/ref.html" target="_top">Boost.Ref</a>) for
|
||||
reference arguments, const qualifying all other arguments.
|
||||
</p>
|
||||
<p>
|
||||
The target functions must be compatible with <a href="http://www.boost.org/libs/utility/utility.htm#result_of" target="_top">Boost.ResultOf</a>,
|
||||
and so are the adapters.
|
||||
</p>
|
||||
</div>
|
||||
<div class="section" lang="en">
|
||||
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
|
||||
<a name="boost_functional_forward.background"></a><a href="index.html#boost_functional_forward.background" title="Background">Background</a></h2></div></div></div>
|
||||
<p>
|
||||
Let's suppose we have some function <code class="computeroutput"><span class="identifier">f</span></code>
|
||||
that we can call like this:
|
||||
</p>
|
||||
<pre class="programlisting"><span class="identifier">f</span><span class="special">(</span><span class="number">123</span><span class="special">,</span><span class="identifier">a_variable</span><span class="special">);</span>
|
||||
</pre>
|
||||
<p>
|
||||
Now we want to write another, generic function <code class="computeroutput"><span class="identifier">g</span></code>
|
||||
that can be called the same way and returns some object that calls <code class="computeroutput"><span class="identifier">f</span></code> with the same arguments.
|
||||
</p>
|
||||
<pre class="programlisting"><span class="identifier">f</span><span class="special">(</span><span class="number">123</span><span class="special">,</span><span class="identifier">a_variable</span><span class="special">)</span> <span class="special">==</span> <span class="identifier">g</span><span class="special">(</span><span class="identifier">f</span><span class="special">,</span><span class="number">123</span><span class="special">,</span><span class="identifier">a_variable</span><span class="special">).</span><span class="identifier">call_f</span><span class="special">()</span>
|
||||
</pre>
|
||||
<a name="boost_functional_forward.background.why_would_we_want_to_do_it__anyway_"></a><h3>
|
||||
<a name="id934701"></a>
|
||||
<a href="index.html#boost_functional_forward.background.why_would_we_want_to_do_it__anyway_">Why
|
||||
would we want to do it, anyway?</a>
|
||||
</h3>
|
||||
<p>
|
||||
Maybe we want to run <code class="computeroutput"><span class="identifier">f</span></code> several
|
||||
times. Or maybe we want to run it within another thread. Maybe we just want
|
||||
to encapsulate the call expression for now, and then use it with other code
|
||||
that allows to compose more complex expressions in order to decompose it with
|
||||
C++ templates and have the compiler generate some machinery that eventually
|
||||
calls <code class="computeroutput"><span class="identifier">f</span></code> at runtime (in other
|
||||
words; apply a technique that is commonly referred to as Expression Templates).
|
||||
</p>
|
||||
<a name="boost_functional_forward.background.now__how_do_we_do_it_"></a><h3>
|
||||
<a name="id934755"></a>
|
||||
<a href="index.html#boost_functional_forward.background.now__how_do_we_do_it_">Now,
|
||||
how do we do it?</a>
|
||||
</h3>
|
||||
<p>
|
||||
The bad news is: It's impossible.
|
||||
</p>
|
||||
<p>
|
||||
That is so because there is a slight difference between a variable and an expression
|
||||
that evaluates to its value: Given
|
||||
</p>
|
||||
<pre class="programlisting"><span class="keyword">int</span> <span class="identifier">y</span><span class="special">;</span>
|
||||
<span class="keyword">int</span> <span class="keyword">const</span> <span class="identifier">z</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span>
|
||||
</pre>
|
||||
<p>
|
||||
and
|
||||
</p>
|
||||
<pre class="programlisting"><span class="keyword">template</span><span class="special"><</span> <span class="keyword">typename</span> <span class="identifier">T</span> <span class="special">></span> <span class="keyword">void</span> <span class="identifier">func1</span><span class="special">(</span><span class="identifier">T</span> <span class="special">&</span> <span class="identifier">x</span><span class="special">);</span>
|
||||
</pre>
|
||||
<p>
|
||||
we can call
|
||||
</p>
|
||||
<pre class="programlisting"><span class="identifier">func1</span><span class="special">(</span><span class="identifier">y</span><span class="special">);</span> <span class="comment">// x is a reference to a non-const object
|
||||
</span><span class="identifier">func1</span><span class="special">(</span><span class="identifier">z</span><span class="special">);</span> <span class="comment">// x is a reference to a const object
|
||||
</span></pre>
|
||||
<p>
|
||||
where
|
||||
</p>
|
||||
<pre class="programlisting"><span class="identifier">func1</span><span class="special">(</span><span class="number">1</span><span class="special">);</span> <span class="comment">// fails to compile.
|
||||
</span></pre>
|
||||
<p>
|
||||
This way we can safely have <code class="computeroutput"><span class="identifier">func1</span></code>
|
||||
store its reference argument and the compiler keeps us from storing a reference
|
||||
to an object with temporary lifetime.
|
||||
</p>
|
||||
<p>
|
||||
It is important to realize that non-constness and whether an object binds to
|
||||
a non-const reference parameter are two different properties. The latter is
|
||||
the distinction between LValues and RValues. The names stem from the left hand
|
||||
side and the right hand side of assignment expressions, thus LValues are typically
|
||||
the ones you can assign to, and RValues the temporary results from the right
|
||||
hand side expression.
|
||||
</p>
|
||||
<pre class="programlisting"><span class="identifier">y</span> <span class="special">=</span> <span class="number">1</span><span class="special">+</span><span class="number">2</span><span class="special">;</span> <span class="comment">// a is LValue, 1+2 is the expression producing the RValue,
|
||||
</span><span class="comment">// 1+2 = a; // usually makes no sense.
|
||||
</span>
|
||||
<span class="identifier">func1</span><span class="special">(</span><span class="identifier">y</span><span class="special">);</span> <span class="comment">// works, because y is an LValue
|
||||
</span><span class="comment">// func1(1+2); // fails to compile, because we only got an RValue.
|
||||
</span></pre>
|
||||
<p>
|
||||
If we add const qualification on the parameter, our function also accepts RValues:
|
||||
</p>
|
||||
<pre class="programlisting"><span class="keyword">template</span><span class="special"><</span> <span class="keyword">typename</span> <span class="identifier">T</span> <span class="special">></span> <span class="keyword">void</span> <span class="identifier">func2</span><span class="special">(</span><span class="identifier">T</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">x</span><span class="special">);</span>
|
||||
|
||||
<span class="comment">// [...] function scope:
|
||||
</span><span class="identifier">func2</span><span class="special">(</span><span class="number">1</span><span class="special">);</span> <span class="comment">// x is a reference to a const temporary, object,
|
||||
</span><span class="identifier">func2</span><span class="special">(</span><span class="identifier">y</span><span class="special">);</span> <span class="comment">// x is a reference to a const object, while y is not const, and
|
||||
</span><span class="identifier">func2</span><span class="special">(</span><span class="identifier">z</span><span class="special">);</span> <span class="comment">// x is a reference to a const object, just like z.
|
||||
</span></pre>
|
||||
<p>
|
||||
In all cases, the argument <code class="computeroutput"><span class="identifier">x</span></code>
|
||||
in <code class="computeroutput"><span class="identifier">func2</span></code> is a const-qualified
|
||||
LValue. We can use function overloading to identify non-const LValues:
|
||||
</p>
|
||||
<pre class="programlisting"><span class="keyword">template</span><span class="special"><</span> <span class="keyword">typename</span> <span class="identifier">T</span> <span class="special">></span> <span class="keyword">void</span> <span class="identifier">func3</span><span class="special">(</span><span class="identifier">T</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">x</span><span class="special">);</span> <span class="comment">// #1
|
||||
</span><span class="keyword">template</span><span class="special"><</span> <span class="keyword">typename</span> <span class="identifier">T</span> <span class="special">></span> <span class="keyword">void</span> <span class="identifier">func3</span><span class="special">(</span><span class="identifier">T</span> <span class="special">&</span> <span class="identifier">x</span><span class="special">);</span> <span class="comment">// #2
|
||||
</span>
|
||||
<span class="comment">// [...] function scope:
|
||||
</span><span class="identifier">func3</span><span class="special">(</span><span class="number">1</span><span class="special">);</span> <span class="comment">// x is a reference to a const, temporary object in #1,
|
||||
</span><span class="identifier">func3</span><span class="special">(</span><span class="identifier">y</span><span class="special">);</span> <span class="comment">// x is a reference to a non-const object in #2, and
|
||||
</span><span class="identifier">func3</span><span class="special">(</span><span class="identifier">z</span><span class="special">);</span> <span class="comment">// x is a reference to a const object in #1.
|
||||
</span></pre>
|
||||
<p>
|
||||
Note that all arguments <code class="computeroutput"><span class="identifier">x</span></code> in
|
||||
the overloaded function <code class="computeroutput"><span class="identifier">func3</span></code>
|
||||
are LValues. In fact, there is no way to transport RValues into a function
|
||||
as-is in C++98. Also note that we can't distinguish between what used to be
|
||||
a const qualified LValue and an RValue.
|
||||
</p>
|
||||
<p>
|
||||
That's as close as we can get to a generic forwarding function <code class="computeroutput"><span class="identifier">g</span></code> as described above by the means of C++
|
||||
98. See <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2002/n1385.htm" target="_top">The
|
||||
Forwarding Problem</a> for a very detailed discussion including solutions
|
||||
that require language changes.
|
||||
</p>
|
||||
<p>
|
||||
Now, for actually implementing it, we need 2^N overloads for N parameters (each
|
||||
with and without const qualifier) for each number of arguments (that is 2^(Nmax+1)
|
||||
- 2^Nmin). Right, that means the compile-time complexity is O(2^N), however
|
||||
the factor is low so it works quite well for a reasonable number (< 10)
|
||||
of arguments.
|
||||
</p>
|
||||
</div>
|
||||
<div class="section" lang="en">
|
||||
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
|
||||
<a name="boost_functional_forward.reference"></a><a href="index.html#boost_functional_forward.reference" title=" Reference"> Reference</a></h2></div></div></div>
|
||||
<div class="toc"><dl>
|
||||
<dt><span class="section"><a href="index.html#boost_functional_forward.reference.forward_adapter">forward_adapter</a></span></dt>
|
||||
<dt><span class="section"><a href="index.html#boost_functional_forward.reference.lightweight_forward_adapter">lightweight_forward_adapter</a></span></dt>
|
||||
</dl></div>
|
||||
<div class="section" lang="en">
|
||||
<div class="titlepage"><div><div><h3 class="title">
|
||||
<a name="boost_functional_forward.reference.forward_adapter"></a><a href="index.html#boost_functional_forward.reference.forward_adapter" title="forward_adapter">forward_adapter</a></h3></div></div></div>
|
||||
<a name="boost_functional_forward.reference.forward_adapter.description"></a><h4>
|
||||
<a name="id935594"></a>
|
||||
<a href="index.html#boost_functional_forward.reference.forward_adapter.description">Description</a>
|
||||
</h4>
|
||||
<p>
|
||||
Function object adapter template whose instances are callable with LValue
|
||||
and RValue arguments. RValue arguments are forwarded as reference-to-const
|
||||
typed LValues.
|
||||
</p>
|
||||
<p>
|
||||
An arity can be given as second, numeric non-type template argument to restrict
|
||||
forwarding to a specific arity. If a third, numeric non-type template argument
|
||||
is present, the second and third template argument are treated as minimum
|
||||
and maximum arity, respectively. Specifying an arity can be helpful to improve
|
||||
the readability of diagnostic messages and compile time performance.
|
||||
</p>
|
||||
<p>
|
||||
<a href="http://www.boost.org/libs/utility/utility.htm#result_of" target="_top">Boost.ResultOf</a>
|
||||
can be used to determine the result types of specific call expressions.
|
||||
</p>
|
||||
<a name="boost_functional_forward.reference.forward_adapter.header"></a><h4>
|
||||
<a name="id935646"></a>
|
||||
<a href="index.html#boost_functional_forward.reference.forward_adapter.header">Header</a>
|
||||
</h4>
|
||||
<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">functional</span><span class="special">/</span><span class="identifier">forward_adapter</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
|
||||
</pre>
|
||||
<a name="boost_functional_forward.reference.forward_adapter.synopsis"></a><h4>
|
||||
<a name="id935721"></a>
|
||||
<a href="index.html#boost_functional_forward.reference.forward_adapter.synopsis">Synopsis</a>
|
||||
</h4>
|
||||
<pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span>
|
||||
<span class="special">{</span>
|
||||
<span class="keyword">template</span><span class="special"><</span> <span class="keyword">class</span> <span class="identifier">Function</span><span class="special">,</span>
|
||||
<span class="keyword">int</span> <span class="identifier">Arity_Or_MinArity</span> <span class="special">=</span> <span class="emphasis"><em>unspecified</em></span><span class="special">,</span> <span class="keyword">int</span> <span class="identifier">MaxArity</span> <span class="special">=</span> <span class="emphasis"><em>unspecified</em></span> <span class="special">></span>
|
||||
<span class="keyword">class</span> <span class="identifier">forward_adapter</span><span class="special">;</span>
|
||||
<span class="special">}</span>
|
||||
</pre>
|
||||
<div class="variablelist">
|
||||
<p class="title"><b>Notation</b></p>
|
||||
<dl>
|
||||
<dt><span class="term"><code class="computeroutput"><span class="identifier">F</span></code></span></dt>
|
||||
<dd><p>
|
||||
a possibly const qualified function object type or reference type thereof
|
||||
</p></dd>
|
||||
<dt><span class="term"><code class="computeroutput"><span class="identifier">f</span></code></span></dt>
|
||||
<dd><p>
|
||||
an object convertible to <code class="computeroutput"><span class="identifier">F</span></code>
|
||||
</p></dd>
|
||||
<dt><span class="term"><code class="computeroutput"><span class="identifier">FA</span></code></span></dt>
|
||||
<dd><p>
|
||||
the type <code class="computeroutput"><span class="identifier">forward_adapter</span><span class="special"><</span><span class="identifier">F</span><span class="special">></span></code>
|
||||
</p></dd>
|
||||
<dt><span class="term"><code class="computeroutput"><span class="identifier">fa</span></code></span></dt>
|
||||
<dd><p>
|
||||
an instance object of <code class="computeroutput"><span class="identifier">FA</span></code>,
|
||||
initialized with <code class="computeroutput"><span class="identifier">f</span></code>
|
||||
</p></dd>
|
||||
<dt><span class="term"><code class="computeroutput"><span class="identifier">a0</span></code>...<code class="computeroutput"><span class="identifier">aN</span></code></span></dt>
|
||||
<dd><p>
|
||||
arguments to <code class="computeroutput"><span class="identifier">fa</span></code>
|
||||
</p></dd>
|
||||
</dl>
|
||||
</div>
|
||||
<p>
|
||||
The result type of a target function invocation must be
|
||||
</p>
|
||||
<pre class="programlisting"><a href="http://www.boost.org/libs/utility/utility.htm#result_of" target="_top"><code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">result_of</span></code></a><span class="special"><</span><span class="identifier">F</span><span class="special">*(</span><span class="identifier">TA0</span> <span class="special">[</span><span class="keyword">const</span><span class="special">]&...</span><span class="identifier">TAN</span> <span class="special">[</span><span class="keyword">const</span><span class="special">]&])>::</span><span class="identifier">type</span>
|
||||
</pre>
|
||||
<p>
|
||||
where <code class="computeroutput"><span class="identifier">TA0</span></code>...<code class="computeroutput"><span class="identifier">TAN</span></code> denote the argument types of <code class="computeroutput"><span class="identifier">a0</span></code>...<code class="computeroutput"><span class="identifier">aN</span></code>.
|
||||
</p>
|
||||
<a name="boost_functional_forward.reference.forward_adapter.expression_semantics"></a><h4>
|
||||
<a name="id936177"></a>
|
||||
<a href="index.html#boost_functional_forward.reference.forward_adapter.expression_semantics">Expression
|
||||
Semantics</a>
|
||||
</h4>
|
||||
<div class="informaltable"><table class="table">
|
||||
<colgroup>
|
||||
<col>
|
||||
<col>
|
||||
</colgroup>
|
||||
<thead><tr>
|
||||
<th>
|
||||
<p>
|
||||
Expression
|
||||
</p>
|
||||
</th>
|
||||
<th>
|
||||
<p>
|
||||
Semantics
|
||||
</p>
|
||||
</th>
|
||||
</tr></thead>
|
||||
<tbody>
|
||||
<tr>
|
||||
<td>
|
||||
<p>
|
||||
<code class="computeroutput"><span class="identifier">FA</span><span class="special">(</span><span class="identifier">f</span><span class="special">)</span></code>
|
||||
</p>
|
||||
</td>
|
||||
<td>
|
||||
<p>
|
||||
creates an adapter, initializes the target function with <code class="computeroutput"><span class="identifier">f</span></code>.
|
||||
</p>
|
||||
</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>
|
||||
<p>
|
||||
<code class="computeroutput"><span class="identifier">FA</span><span class="special">()</span></code>
|
||||
</p>
|
||||
</td>
|
||||
<td>
|
||||
<p>
|
||||
creates an adapter, attempts to use <code class="computeroutput"><span class="identifier">F</span></code>'s
|
||||
default constructor.
|
||||
</p>
|
||||
</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>
|
||||
<p>
|
||||
<code class="computeroutput"><span class="identifier">fa</span><span class="special">(</span><span class="identifier">a0</span></code>...<code class="computeroutput"><span class="identifier">aN</span><span class="special">)</span></code>
|
||||
</p>
|
||||
</td>
|
||||
<td>
|
||||
<p>
|
||||
calls <code class="computeroutput"><span class="identifier">f</span></code> with with
|
||||
arguments <code class="computeroutput"><span class="identifier">a0</span></code>...<code class="computeroutput"><span class="identifier">aN</span></code>.
|
||||
</p>
|
||||
</td>
|
||||
</tr>
|
||||
</tbody>
|
||||
</table></div>
|
||||
<a name="boost_functional_forward.reference.forward_adapter.limits"></a><h4>
|
||||
<a name="id936405"></a>
|
||||
<a href="index.html#boost_functional_forward.reference.forward_adapter.limits">Limits</a>
|
||||
</h4>
|
||||
<p>
|
||||
The macro BOOST_FUNCTIONAL_FORWARD_ADAPTER_MAX_ARITY can be defined to set
|
||||
the maximum call arity. It defaults to 6.
|
||||
</p>
|
||||
<a name="boost_functional_forward.reference.forward_adapter.complexity"></a><h4>
|
||||
<a name="id936434"></a>
|
||||
<a href="index.html#boost_functional_forward.reference.forward_adapter.complexity">Complexity</a>
|
||||
</h4>
|
||||
<p>
|
||||
Preprocessing time: O(2^N), where N is the arity limit. Compile time: O(2^N),
|
||||
where N depends on the arity range. Run time: O(0) if the compiler inlines,
|
||||
O(1) otherwise.
|
||||
</p>
|
||||
</div>
|
||||
<div class="section" lang="en">
|
||||
<div class="titlepage"><div><div><h3 class="title">
|
||||
<a name="boost_functional_forward.reference.lightweight_forward_adapter"></a><a href="index.html#boost_functional_forward.reference.lightweight_forward_adapter" title="lightweight_forward_adapter">lightweight_forward_adapter</a></h3></div></div></div>
|
||||
<a name="boost_functional_forward.reference.lightweight_forward_adapter.description"></a><h4>
|
||||
<a name="id936485"></a>
|
||||
<a href="index.html#boost_functional_forward.reference.lightweight_forward_adapter.description">Description</a>
|
||||
</h4>
|
||||
<p>
|
||||
Function object adapter template whose instances are callable with LValue
|
||||
and RValue arguments. All arguments are forwarded as reference-to-const typed
|
||||
LValues, except for reference wrappers which are unwrapped and may yield
|
||||
non-const LValues.
|
||||
</p>
|
||||
<p>
|
||||
An arity can be given as second, numeric non-type template argument to restrict
|
||||
forwarding to a specific arity. If a third, numeric non-type template argument
|
||||
is present, the second and third template argument are treated as minimum
|
||||
and maximum arity, respectively. Specifying an arity can be helpful to improve
|
||||
the readability of diagnostic messages and compile time performance.
|
||||
</p>
|
||||
<p>
|
||||
<a href="http://www.boost.org/libs/utility/utility.htm#result_of" target="_top">Boost.ResultOf</a>
|
||||
can be used to determine the result types of specific call expressions.
|
||||
</p>
|
||||
<a name="boost_functional_forward.reference.lightweight_forward_adapter.header"></a><h4>
|
||||
<a name="id936540"></a>
|
||||
<a href="index.html#boost_functional_forward.reference.lightweight_forward_adapter.header">Header</a>
|
||||
</h4>
|
||||
<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">functional</span><span class="special">/</span><span class="identifier">lightweight_forward_adapter</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
|
||||
</pre>
|
||||
<a name="boost_functional_forward.reference.lightweight_forward_adapter.synopsis"></a><h4>
|
||||
<a name="id936616"></a>
|
||||
<a href="index.html#boost_functional_forward.reference.lightweight_forward_adapter.synopsis">Synopsis</a>
|
||||
</h4>
|
||||
<pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span>
|
||||
<span class="special">{</span>
|
||||
<span class="keyword">template</span><span class="special"><</span> <span class="keyword">class</span> <span class="identifier">Function</span><span class="special">,</span>
|
||||
<span class="keyword">int</span> <span class="identifier">Arity_Or_MinArity</span> <span class="special">=</span> <span class="emphasis"><em>unspecified</em></span><span class="special">,</span> <span class="keyword">int</span> <span class="identifier">MaxArity</span> <span class="special">=</span> <span class="emphasis"><em>unspecified</em></span> <span class="special">></span>
|
||||
<span class="keyword">struct</span> <span class="identifier">lightweight_forward_adapter</span><span class="special">;</span>
|
||||
<span class="special">}</span>
|
||||
</pre>
|
||||
<div class="variablelist">
|
||||
<p class="title"><b>Notation</b></p>
|
||||
<dl>
|
||||
<dt><span class="term"><code class="computeroutput"><span class="identifier">F</span></code></span></dt>
|
||||
<dd><p>
|
||||
a possibly const qualified function object type or reference type thereof
|
||||
</p></dd>
|
||||
<dt><span class="term"><code class="computeroutput"><span class="identifier">f</span></code></span></dt>
|
||||
<dd><p>
|
||||
an object convertible to <code class="computeroutput"><span class="identifier">F</span></code>
|
||||
</p></dd>
|
||||
<dt><span class="term"><code class="computeroutput"><span class="identifier">FA</span></code></span></dt>
|
||||
<dd><p>
|
||||
the type <code class="computeroutput"><span class="identifier">lightweight_forward_adapter</span><span class="special"><</span><span class="identifier">F</span><span class="special">></span></code>
|
||||
</p></dd>
|
||||
<dt><span class="term"><code class="computeroutput"><span class="identifier">fa</span></code></span></dt>
|
||||
<dd><p>
|
||||
an instance of <code class="computeroutput"><span class="identifier">FA</span></code>, initialized
|
||||
with <code class="computeroutput"><span class="identifier">f</span></code>
|
||||
</p></dd>
|
||||
<dt><span class="term"><code class="computeroutput"><span class="identifier">a0</span></code>...<code class="computeroutput"><span class="identifier">aN</span></code></span></dt>
|
||||
<dd><p>
|
||||
arguments to <code class="computeroutput"><span class="identifier">fa</span></code>
|
||||
</p></dd>
|
||||
</dl>
|
||||
</div>
|
||||
<p>
|
||||
The result type of a target function invocation must be
|
||||
</p>
|
||||
<pre class="programlisting"><a href="http://www.boost.org/libs/utility/utility.htm#result_of" target="_top"><code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">result_of</span></code></a><span class="special"><</span><span class="identifier">F</span><span class="special">*(</span><span class="identifier">TA0</span> <span class="special">[</span><span class="keyword">const</span><span class="special">]&...</span><span class="identifier">TAN</span> <span class="special">[</span><span class="keyword">const</span><span class="special">]&])>::</span><span class="identifier">type</span>
|
||||
</pre>
|
||||
<p>
|
||||
where <code class="computeroutput"><span class="identifier">TA0</span></code>...<code class="computeroutput"><span class="identifier">TAN</span></code> denote the argument types of <code class="computeroutput"><span class="identifier">a0</span></code>...<code class="computeroutput"><span class="identifier">aN</span></code>.
|
||||
</p>
|
||||
<a name="boost_functional_forward.reference.lightweight_forward_adapter.expression_semantics"></a><h4>
|
||||
<a name="id937073"></a>
|
||||
<a href="index.html#boost_functional_forward.reference.lightweight_forward_adapter.expression_semantics">Expression
|
||||
Semantics</a>
|
||||
</h4>
|
||||
<div class="informaltable"><table class="table">
|
||||
<colgroup>
|
||||
<col>
|
||||
<col>
|
||||
</colgroup>
|
||||
<thead><tr>
|
||||
<th>
|
||||
<p>
|
||||
Expression
|
||||
</p>
|
||||
</th>
|
||||
<th>
|
||||
<p>
|
||||
Semantics
|
||||
</p>
|
||||
</th>
|
||||
</tr></thead>
|
||||
<tbody>
|
||||
<tr>
|
||||
<td>
|
||||
<p>
|
||||
<code class="computeroutput"><span class="identifier">FA</span><span class="special">(</span><span class="identifier">f</span><span class="special">)</span></code>
|
||||
</p>
|
||||
</td>
|
||||
<td>
|
||||
<p>
|
||||
creates an adapter, initializes the target function with <code class="computeroutput"><span class="identifier">f</span></code>.
|
||||
</p>
|
||||
</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>
|
||||
<p>
|
||||
<code class="computeroutput"><span class="identifier">FA</span><span class="special">()</span></code>
|
||||
</p>
|
||||
</td>
|
||||
<td>
|
||||
<p>
|
||||
creates an adapter, attempts to use <code class="computeroutput"><span class="identifier">F</span></code>'s
|
||||
default constructor.
|
||||
</p>
|
||||
</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>
|
||||
<p>
|
||||
<code class="computeroutput"><span class="identifier">fa</span><span class="special">(</span><span class="identifier">a0</span></code>...<code class="computeroutput"><span class="identifier">aN</span><span class="special">)</span></code>
|
||||
</p>
|
||||
</td>
|
||||
<td>
|
||||
<p>
|
||||
calls <code class="computeroutput"><span class="identifier">f</span></code> with with
|
||||
const arguments <code class="computeroutput"><span class="identifier">a0</span></code>...<code class="computeroutput"><span class="identifier">aN</span></code>. If <code class="computeroutput"><span class="identifier">aI</span></code>
|
||||
is a reference wrapper it is unwrapped.
|
||||
</p>
|
||||
</td>
|
||||
</tr>
|
||||
</tbody>
|
||||
</table></div>
|
||||
<a name="boost_functional_forward.reference.lightweight_forward_adapter.limits"></a><h4>
|
||||
<a name="id937311"></a>
|
||||
<a href="index.html#boost_functional_forward.reference.lightweight_forward_adapter.limits">Limits</a>
|
||||
</h4>
|
||||
<p>
|
||||
The macro BOOST_FUNCTIONAL_LIGHTWEIGHT_FORWARD_ADAPTER_MAX_ARITY can be defined
|
||||
to set the maximum call arity. It defaults to 10.
|
||||
</p>
|
||||
<a name="boost_functional_forward.reference.lightweight_forward_adapter.complexity"></a><h4>
|
||||
<a name="id937342"></a>
|
||||
<a href="index.html#boost_functional_forward.reference.lightweight_forward_adapter.complexity">Complexity</a>
|
||||
</h4>
|
||||
<p>
|
||||
Preprocessing time: O(N), where N is the arity limit. Compile time: O(N),
|
||||
where N is the effective arity of a call. Run time: O(0) if the compiler
|
||||
inlines, O(1) otherwise.
|
||||
</p>
|
||||
</div>
|
||||
</div>
|
||||
<div class="section" lang="en">
|
||||
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
|
||||
<a name="boost_functional_forward.acknowledgements"></a><a href="index.html#boost_functional_forward.acknowledgements" title="Acknowledgements">Acknowledgements</a></h2></div></div></div>
|
||||
<p>
|
||||
As these utilities are factored out of the <a href="http://www.boost.org/libs/fusion/doc/html/index.html" target="_top">Boost.Fusion</a>
|
||||
functional module, I want to thank Dan Marsden and Joel de Guzman for letting
|
||||
me participate in the development of that great library in the first place.
|
||||
</p>
|
||||
<p>
|
||||
Further, I want to credit the authors of the references below, for their in-depth
|
||||
investigation of the problem and the solution implemented here.
|
||||
</p>
|
||||
<p>
|
||||
Last but not least I want to thank Vesa Karnoven and Paul Mensonides for the
|
||||
Boost Preprocessor library. Without it, I would have ended up with an external
|
||||
code generator for this one.
|
||||
</p>
|
||||
</div>
|
||||
<div class="section" lang="en">
|
||||
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
|
||||
<a name="boost_functional_forward.references"></a><a href="index.html#boost_functional_forward.references" title="References">References</a></h2></div></div></div>
|
||||
<div class="orderedlist"><ol type="1">
|
||||
<li>
|
||||
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2002/n1385.htm" target="_top">The
|
||||
Forwarding Problem</a>, Peter Dimov, Howard E. Hinnant, David Abrahams,
|
||||
2002
|
||||
</li>
|
||||
<li>
|
||||
<a href="http://www.boost.org/libs/utility/utility.htm#result_of" target="_top">Boost.ResultOf</a>,
|
||||
Douglas Gregor, 2004
|
||||
</li>
|
||||
<li>
|
||||
<a href="http://www.boost.org/doc/html/ref.html" target="_top">Boost.Ref</a>, Jaakko
|
||||
Jarvi, Peter Dimov, Douglas Gregor, David Abrahams, 1999-2002
|
||||
</li>
|
||||
</ol></div>
|
||||
</div>
|
||||
</div>
|
||||
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
|
||||
<td align="left"><p><small>Last revised: November 01, 2008 at 19:58:50 GMT</small></p></td>
|
||||
<td align="right"><div class="copyright-footer"></div></td>
|
||||
</tr></table>
|
||||
<hr>
|
||||
<div class="spirit-nav"></div>
|
||||
</body>
|
||||
Distributed under the Boost Software License, Version 1.0.
|
||||
(See accompanying file LICENSE_1_0.txt or copy at
|
||||
http://www.boost.org/LICENSE_1_0.txt) -->
|
||||
<title>Redirect to generated documentation</title>
|
||||
<meta http-equiv="refresh" content="0; URL=http://boost-sandbox.sourceforge.net/libs/functional/forward/doc/html/">
|
||||
</head>
|
||||
<body>
|
||||
Automatic redirection failed, please go to
|
||||
<a href="http://boost-sandbox.sourceforge.net/libs/functional/forward/doc/html/">http://boost-sandbox.sourceforge.net/libs/functional/forward/doc/html/</a>
|
||||
</body>
|
||||
</html>
|
||||
|
||||
@@ -33,9 +33,9 @@
|
||||
|
||||
</span>BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_ARITY_MAX</pre></div>
|
||||
<div class="refsect1">
|
||||
<a name="id813516"></a><h2>Description</h2>
|
||||
<a name="id821556"></a><h2>Description</h2>
|
||||
<p>If this macro is left undefined by the user, it has a default value of 5 (increasing this number might increase compilation time). When specified by the user, this macro must be a non-negative integer number.</p>
|
||||
<p><span class="bold"><strong>See:</strong></span> <a class="link" href="boost_functional_overloadedfunction/Getting_Started.html" title="Getting Started"> Getting Started</a>, <code class="computeroutput"><a class="link" href="boost/overloaded_function.html" title="Class template overloaded_function">boost::overloaded_function</a></code>. </p>
|
||||
<p><span class="bold"><strong>See:</strong></span> <a class="link" href="boost_functional_overloadedfunction/getting_started.html" title="Getting Started"> Getting Started</a>, <code class="computeroutput"><a class="link" href="boost/overloaded_function.html" title="Class template overloaded_function">boost::overloaded_function</a></code>. </p>
|
||||
</div>
|
||||
</div>
|
||||
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
|
||||
|
||||
@@ -7,7 +7,7 @@
|
||||
<link rel="home" href="index.html" title="Chapter 1. Boost.Functional/OverloadedFunction 1.0.0">
|
||||
<link rel="up" href="reference.html#header.boost.functional.overloaded_function.config_hpp" title="Header <boost/functional/overloaded_function/config.hpp>">
|
||||
<link rel="prev" href="BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_ARITY_MAX.html" title="Macro BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_ARITY_MAX">
|
||||
<link rel="next" href="boost_functional_overloadedfunction/Acknowledgments.html" title="Acknowledgments">
|
||||
<link rel="next" href="boost_functional_overloadedfunction/acknowledgments.html" title="Acknowledgments">
|
||||
</head>
|
||||
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
|
||||
<table cellpadding="2" width="100%"><tr>
|
||||
@@ -20,7 +20,7 @@
|
||||
</tr></table>
|
||||
<hr>
|
||||
<div class="spirit-nav">
|
||||
<a accesskey="p" href="BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_ARITY_MAX.html"><img src="../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="reference.html#header.boost.functional.overloaded_function.config_hpp"><img src="../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="index.html"><img src="../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="boost_functional_overloadedfunction/Acknowledgments.html"><img src="../../../../../doc/src/images/next.png" alt="Next"></a>
|
||||
<a accesskey="p" href="BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_ARITY_MAX.html"><img src="../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="reference.html#header.boost.functional.overloaded_function.config_hpp"><img src="../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="index.html"><img src="../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="boost_functional_overloadedfunction/acknowledgments.html"><img src="../../../../../doc/src/images/next.png" alt="Next"></a>
|
||||
</div>
|
||||
<div class="refentry">
|
||||
<a name="BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_OVERLOAD_MAX"></a><div class="titlepage"></div>
|
||||
@@ -33,9 +33,9 @@
|
||||
|
||||
</span>BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_OVERLOAD_MAX</pre></div>
|
||||
<div class="refsect1">
|
||||
<a name="id813573"></a><h2>Description</h2>
|
||||
<a name="id821614"></a><h2>Description</h2>
|
||||
<p>If this macro is left undefined by the user, it has a default value of 5 (increasing this number might increase compilation time). When defined by the user, this macro must be an integer number greater or equal than 2 (because at least two distinct functions need to be specified in order to define an overload).</p>
|
||||
<p><span class="bold"><strong>See:</strong></span> <a class="link" href="boost_functional_overloadedfunction/Getting_Started.html" title="Getting Started"> Getting Started</a>, <code class="computeroutput"><a class="link" href="boost/overloaded_function.html" title="Class template overloaded_function">boost::overloaded_function</a></code>. </p>
|
||||
<p><span class="bold"><strong>See:</strong></span> <a class="link" href="boost_functional_overloadedfunction/getting_started.html" title="Getting Started"> Getting Started</a>, <code class="computeroutput"><a class="link" href="boost/overloaded_function.html" title="Class template overloaded_function">boost::overloaded_function</a></code>. </p>
|
||||
</div>
|
||||
</div>
|
||||
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
|
||||
@@ -48,7 +48,7 @@
|
||||
</tr></table>
|
||||
<hr>
|
||||
<div class="spirit-nav">
|
||||
<a accesskey="p" href="BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_ARITY_MAX.html"><img src="../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="reference.html#header.boost.functional.overloaded_function.config_hpp"><img src="../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="index.html"><img src="../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="boost_functional_overloadedfunction/Acknowledgments.html"><img src="../../../../../doc/src/images/next.png" alt="Next"></a>
|
||||
<a accesskey="p" href="BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_ARITY_MAX.html"><img src="../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="reference.html#header.boost.functional.overloaded_function.config_hpp"><img src="../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="index.html"><img src="../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="boost_functional_overloadedfunction/acknowledgments.html"><img src="../../../../../doc/src/images/next.png" alt="Next"></a>
|
||||
</div>
|
||||
</body>
|
||||
</html>
|
||||
|
||||
@@ -36,12 +36,12 @@
|
||||
<a class="link" href="overloaded_function.html" title="Class template overloaded_function">overloaded_function</a><span class="special"><</span> <span class="identifier">__function_type__</span><span class="special"><</span> <span class="identifier">F1</span> <span class="special">></span><span class="special">,</span> <span class="identifier">__function_type__</span><span class="special"><</span> <span class="identifier">F2</span> <span class="special">></span><span class="special">,</span><span class="special">...</span><span class="special">></span>
|
||||
<span class="identifier">make_overloaded_function</span><span class="special">(</span><span class="identifier">F1</span> f1<span class="special">,</span> <span class="identifier">F2</span> f2<span class="special">,</span> <span class="special">...</span><span class="special">)</span><span class="special">;</span></pre></div>
|
||||
<div class="refsect1">
|
||||
<a name="id813336"></a><h2>Description</h2>
|
||||
<a name="id821376"></a><h2>Description</h2>
|
||||
<p>This function template creates and returns an <code class="computeroutput"><code class="computeroutput"><a class="link" href="overloaded_function.html" title="Class template overloaded_function">overloaded_function</a></code></code> object that overloads all the specified functions <code class="computeroutput">f1</code>, <code class="computeroutput">f2</code>, etc.</p>
|
||||
<p>The function types are internally determined from the template parameter types so they do not need to be explicitly specified. Therefore, this function template usually has a more concise syntax when compared with <code class="computeroutput"><code class="computeroutput"><a class="link" href="overloaded_function.html" title="Class template overloaded_function">overloaded_function</a></code></code>. This is especially useful when the explicit type of the returned <code class="computeroutput"><code class="computeroutput"><a class="link" href="overloaded_function.html" title="Class template overloaded_function">overloaded_function</a></code></code> object does not need to be known (e.g., when used with Boost.Typeof's <code class="computeroutput">BOOST_AUTO</code>, C++11 <code class="computeroutput">auto</code>, or when the overloaded function object is handled using a function template parameter, see the <a class="link" href="../boost_functional_overloadedfunction/Tutorial.html" title="Tutorial">Tutorial</a> section).</p>
|
||||
<p>The function types are internally determined from the template parameter types so they do not need to be explicitly specified. Therefore, this function template usually has a more concise syntax when compared with <code class="computeroutput"><code class="computeroutput"><a class="link" href="overloaded_function.html" title="Class template overloaded_function">overloaded_function</a></code></code>. This is especially useful when the explicit type of the returned <code class="computeroutput"><code class="computeroutput"><a class="link" href="overloaded_function.html" title="Class template overloaded_function">overloaded_function</a></code></code> object does not need to be known (e.g., when used with Boost.Typeof's <code class="computeroutput">BOOST_AUTO</code>, C++11 <code class="computeroutput">auto</code>, or when the overloaded function object is handled using a function template parameter, see the <a class="link" href="../boost_functional_overloadedfunction/tutorial.html" title="Tutorial"> Tutorial</a> section).</p>
|
||||
<p>The maximum number of functions to overload is given by the <code class="computeroutput"><code class="computeroutput"><a class="link" href="../BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_OVERLOAD_MAX.html" title="Macro BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_OVERLOAD_MAX">BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_OVERLOAD_MAX</a></code></code> configuration macro.</p>
|
||||
<p><span class="bold"><strong>Note:</strong></span> In this documentation, <code class="computeroutput">__function_type__</code> is a placeholder for a symbol that is specific to the implementation of this library.</p>
|
||||
<p><span class="bold"><strong>See:</strong></span> <a class="link" href="../boost_functional_overloadedfunction/Tutorial.html" title="Tutorial">Tutorial</a> section, <code class="computeroutput"><code class="computeroutput"><a class="link" href="overloaded_function.html" title="Class template overloaded_function">overloaded_function</a></code></code>, <code class="computeroutput"><code class="computeroutput"><a class="link" href="../BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_OVERLOAD_MAX.html" title="Macro BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_OVERLOAD_MAX">BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_OVERLOAD_MAX</a></code></code>. </p>
|
||||
<p><span class="bold"><strong>See:</strong></span> <a class="link" href="../boost_functional_overloadedfunction/tutorial.html" title="Tutorial"> Tutorial</a> section, <code class="computeroutput"><code class="computeroutput"><a class="link" href="overloaded_function.html" title="Class template overloaded_function">overloaded_function</a></code></code>, <code class="computeroutput"><code class="computeroutput"><a class="link" href="../BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_OVERLOAD_MAX.html" title="Macro BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_OVERLOAD_MAX">BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_OVERLOAD_MAX</a></code></code>. </p>
|
||||
</div>
|
||||
</div>
|
||||
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
|
||||
|
||||
@@ -35,19 +35,19 @@
|
||||
<span class="keyword">class</span> <a class="link" href="overloaded_function.html" title="Class template overloaded_function">overloaded_function</a> <span class="special">{</span>
|
||||
<span class="keyword">public</span><span class="special">:</span>
|
||||
<span class="comment">// <a class="link" href="overloaded_function.html#boost.overloaded_functionconstruct-copy-destruct">construct/copy/destruct</a></span>
|
||||
<a class="link" href="overloaded_function.html#id313151-bb"><span class="identifier">overloaded_function</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">function</span><span class="special"><</span> <span class="identifier">F1</span> <span class="special">></span> <span class="special">&</span><span class="special">,</span>
|
||||
<a class="link" href="overloaded_function.html#id259090-bb"><span class="identifier">overloaded_function</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">function</span><span class="special"><</span> <span class="identifier">F1</span> <span class="special">></span> <span class="special">&</span><span class="special">,</span>
|
||||
<span class="keyword">const</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">function</span><span class="special"><</span> <span class="identifier">F2</span> <span class="special">></span> <span class="special">&</span><span class="special">,</span> <span class="special">...</span><span class="special">)</span><span class="special">;</span>
|
||||
|
||||
<span class="comment">// <a class="link" href="overloaded_function.html#id313082-bb">public member functions</a></span>
|
||||
<span class="comment">// <a class="link" href="overloaded_function.html#id259020-bb">public member functions</a></span>
|
||||
<span class="identifier">boost</span><span class="special">::</span><span class="identifier">function_traits</span><span class="special"><</span> <span class="identifier">F1</span> <span class="special">></span><span class="special">::</span><span class="identifier">result_type</span>
|
||||
<a class="link" href="overloaded_function.html#id313084-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="keyword">typename</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">function_traits</span><span class="special"><</span> <span class="identifier">F1</span> <span class="special">></span><span class="special">::</span><span class="identifier">arg1_type</span><span class="special">,</span>
|
||||
<a class="link" href="overloaded_function.html#id259023-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="keyword">typename</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">function_traits</span><span class="special"><</span> <span class="identifier">F1</span> <span class="special">></span><span class="special">::</span><span class="identifier">arg1_type</span><span class="special">,</span>
|
||||
<span class="keyword">typename</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">function_traits</span><span class="special"><</span> <span class="identifier">F1</span> <span class="special">></span><span class="special">::</span><span class="identifier">arg2_type</span><span class="special">,</span> <span class="special">...</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
|
||||
<span class="identifier">boost</span><span class="special">::</span><span class="identifier">function_traits</span><span class="special"><</span> <span class="identifier">F2</span> <span class="special">></span><span class="special">::</span><span class="identifier">result_type</span>
|
||||
<a class="link" href="overloaded_function.html#id313110-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="keyword">typename</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">function_traits</span><span class="special"><</span> <span class="identifier">F2</span> <span class="special">></span><span class="special">::</span><span class="identifier">arg1_type</span><span class="special">,</span>
|
||||
<a class="link" href="overloaded_function.html#id259049-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="keyword">typename</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">function_traits</span><span class="special"><</span> <span class="identifier">F2</span> <span class="special">></span><span class="special">::</span><span class="identifier">arg1_type</span><span class="special">,</span>
|
||||
<span class="keyword">typename</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">function_traits</span><span class="special"><</span> <span class="identifier">F2</span> <span class="special">></span><span class="special">::</span><span class="identifier">arg2_type</span><span class="special">,</span> <span class="special">...</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
|
||||
<span class="special">}</span><span class="special">;</span></pre></div>
|
||||
<div class="refsect1">
|
||||
<a name="id812550"></a><h2>Description</h2>
|
||||
<a name="id820590"></a><h2>Description</h2>
|
||||
<p>This function object aggregates together calls to functions of all the specified function types <code class="computeroutput">F1</code>, <code class="computeroutput">F2</code>, etc which must have distinct function signatures from one another.</p>
|
||||
<p><span class="bold"><strong>Parameters:</strong></span> </p>
|
||||
<div class="informaltable"><table class="table">
|
||||
@@ -65,30 +65,30 @@
|
||||
</p>
|
||||
<p>In some cases, the <code class="computeroutput"><a class="link" href="make_overloaded_function.html" title="Function template make_overloaded_function">make_overloaded_function</a></code> function template can be useful to construct an overloaded function object without explicitly specifying the function types.</p>
|
||||
<p>At least two distinct function types must be specified (because there is nothing to overload between one or zero functions). The maximum number of functions to overload is given by the <code class="computeroutput"><a class="link" href="../BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_OVERLOAD_MAX.html" title="Macro BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_OVERLOAD_MAX">BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_OVERLOAD_MAX</a></code> configuration macro. The maximum number of function parameters for each of the specified function types is given by the <code class="computeroutput"><a class="link" href="../BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_ARITY_MAX.html" title="Macro BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_ARITY_MAX">BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_ARITY_MAX</a></code> configuration macro.</p>
|
||||
<p><span class="bold"><strong>See:</strong></span> <a class="link" href="../boost_functional_overloadedfunction/Tutorial.html" title="Tutorial">Tutorial</a> section, <code class="computeroutput"><a class="link" href="make_overloaded_function.html" title="Function template make_overloaded_function">make_overloaded_function</a></code>, <code class="computeroutput"><a class="link" href="../BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_OVERLOAD_MAX.html" title="Macro BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_OVERLOAD_MAX">BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_OVERLOAD_MAX</a></code>, <code class="computeroutput"><a class="link" href="../BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_ARITY_MAX.html" title="Macro BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_ARITY_MAX">BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_ARITY_MAX</a></code>, Boost.Function. </p>
|
||||
<p><span class="bold"><strong>See:</strong></span> <a class="link" href="../boost_functional_overloadedfunction/tutorial.html" title="Tutorial"> Tutorial</a> section, <code class="computeroutput"><a class="link" href="make_overloaded_function.html" title="Function template make_overloaded_function">make_overloaded_function</a></code>, <code class="computeroutput"><a class="link" href="../BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_OVERLOAD_MAX.html" title="Macro BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_OVERLOAD_MAX">BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_OVERLOAD_MAX</a></code>, <code class="computeroutput"><a class="link" href="../BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_ARITY_MAX.html" title="Macro BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_ARITY_MAX">BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_ARITY_MAX</a></code>, Boost.Function. </p>
|
||||
<div class="refsect2">
|
||||
<a name="id812697"></a><h3>
|
||||
<a name="id820738"></a><h3>
|
||||
<a name="boost.overloaded_functionconstruct-copy-destruct"></a><code class="computeroutput">overloaded_function</code>
|
||||
public
|
||||
construct/copy/destruct</h3>
|
||||
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
|
||||
<pre class="literallayout"><a name="id313151-bb"></a><span class="identifier">overloaded_function</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">function</span><span class="special"><</span> <span class="identifier">F1</span> <span class="special">></span> <span class="special">&</span><span class="special">,</span>
|
||||
<pre class="literallayout"><a name="id259090-bb"></a><span class="identifier">overloaded_function</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">function</span><span class="special"><</span> <span class="identifier">F1</span> <span class="special">></span> <span class="special">&</span><span class="special">,</span>
|
||||
<span class="keyword">const</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">function</span><span class="special"><</span> <span class="identifier">F2</span> <span class="special">></span> <span class="special">&</span><span class="special">,</span> <span class="special">...</span><span class="special">)</span><span class="special">;</span></pre>Construct the overloaded function object. <p>Any function pointer, function reference, and monomorphic function object that can be converted to a <code class="computeroutput">boost::function</code> function object can be specified as parameter.</p>
|
||||
<p><span class="bold"><strong>Note:</strong></span> Unfortunately, it is not possible to support polymorphic function objects (as explained <a href="http://lists.boost.org/Archives/boost/2012/03/191744.php" target="_top">here</a>). </p>
|
||||
</li></ol></div>
|
||||
</div>
|
||||
<div class="refsect2">
|
||||
<a name="id812834"></a><h3>
|
||||
<a name="id313082-bb"></a><code class="computeroutput">overloaded_function</code> public member functions</h3>
|
||||
<a name="id820874"></a><h3>
|
||||
<a name="id259020-bb"></a><code class="computeroutput">overloaded_function</code> public member functions</h3>
|
||||
<div class="orderedlist"><ol class="orderedlist" type="1">
|
||||
<li class="listitem">
|
||||
<pre class="literallayout"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">function_traits</span><span class="special"><</span> <span class="identifier">F1</span> <span class="special">></span><span class="special">::</span><span class="identifier">result_type</span>
|
||||
<a name="id313084-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="keyword">typename</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">function_traits</span><span class="special"><</span> <span class="identifier">F1</span> <span class="special">></span><span class="special">::</span><span class="identifier">arg1_type</span><span class="special">,</span>
|
||||
<a name="id259023-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="keyword">typename</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">function_traits</span><span class="special"><</span> <span class="identifier">F1</span> <span class="special">></span><span class="special">::</span><span class="identifier">arg1_type</span><span class="special">,</span>
|
||||
<span class="keyword">typename</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">function_traits</span><span class="special"><</span> <span class="identifier">F1</span> <span class="special">></span><span class="special">::</span><span class="identifier">arg2_type</span><span class="special">,</span> <span class="special">...</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>Call operator matching the signature of the function type specified as 1st template parameter. <p>This will in turn invoke the call operator of the 1st function passed to the constructor. </p>
|
||||
</li>
|
||||
<li class="listitem">
|
||||
<pre class="literallayout"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">function_traits</span><span class="special"><</span> <span class="identifier">F2</span> <span class="special">></span><span class="special">::</span><span class="identifier">result_type</span>
|
||||
<a name="id313110-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="keyword">typename</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">function_traits</span><span class="special"><</span> <span class="identifier">F2</span> <span class="special">></span><span class="special">::</span><span class="identifier">arg1_type</span><span class="special">,</span>
|
||||
<a name="id259049-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="keyword">typename</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">function_traits</span><span class="special"><</span> <span class="identifier">F2</span> <span class="special">></span><span class="special">::</span><span class="identifier">arg1_type</span><span class="special">,</span>
|
||||
<span class="keyword">typename</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">function_traits</span><span class="special"><</span> <span class="identifier">F2</span> <span class="special">></span><span class="special">::</span><span class="identifier">arg2_type</span><span class="special">,</span> <span class="special">...</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>Call operator matching the signature of the function type specified as 2nd template parameter. <p>This will in turn invoke the call operator of the 2nd function passed to the constructor.</p>
|
||||
<p><span class="bold"><strong>Note:</strong></span> Similar call operators are present for all specified function types <code class="computeroutput">F1</code>, <code class="computeroutput">F2</code>, etc (even if not exhaustively listed by this documentation). </p>
|
||||
</li>
|
||||
|
||||
@@ -21,9 +21,9 @@
|
||||
<div class="spirit-nav">
|
||||
<a accesskey="p" href="../BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_OVERLOAD_MAX.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../index.html"><img src="../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../../../../../../doc/src/images/home.png" alt="Home"></a>
|
||||
</div>
|
||||
<div class="section boost_functional_overloadedfunction_Acknowledgments">
|
||||
<div class="section boost_functional_overloadedfunction_acknowledgments">
|
||||
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
|
||||
<a name="boost_functional_overloadedfunction.Acknowledgments"></a><a class="link" href="Acknowledgments.html" title="Acknowledgments">Acknowledgments</a>
|
||||
<a name="boost_functional_overloadedfunction.acknowledgments"></a><a class="link" href="acknowledgments.html" title="Acknowledgments">Acknowledgments</a>
|
||||
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Many thanks to Mathias Gaunard for suggesting to implement <code class="computeroutput"><a class="link" href="../boost/overloaded_function.html" title="Class template overloaded_function">boost::overloaded_function</a></code>
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<dt><span class="section"><a href="Getting_Started.html#boost_functional_overloadedfunction.Getting_Started.compilers_and_platforms">Compilers
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and Platforms</a></span></dt>
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This section explains how to setup a system to use this library.
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<a name="boost_functional_overloadedfunction.getting_started.compilers_and_platforms"></a><a class="link" href="getting_started.html#boost_functional_overloadedfunction.getting_started.compilers_and_platforms" title="Compilers and Platforms">Compilers
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for any special configuration that might be required for a specific compiler.
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<a name="boost_functional_overloadedfunction.getting_started.installation"></a><a class="link" href="getting_started.html#boost_functional_overloadedfunction.getting_started.installation" title="Installation">Installation</a>
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This library is composed of header files only. Therefore there is no pre-compiled
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<div class="section boost_functional_overloadedfunction_Tutorial">
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<a name="boost_functional_overloadedfunction.Tutorial"></a><a class="link" href="Tutorial.html" title="Tutorial">Tutorial</a>
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<div class="toc"><dl>
|
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<dt><span class="section"><a href="Tutorial.html#boost_functional_overloadedfunction.Tutorial.overloading">Overloading</a></span></dt>
|
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<dt><span class="section"><a href="Tutorial.html#boost_functional_overloadedfunction.Tutorial.without_function_types">Without
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<dt><span class="section"><a href="tutorial.html#boost_functional_overloadedfunction.tutorial.overloading">Overloading</a></span></dt>
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Function Types</a></span></dt>
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|
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This section explains how to use this library.
|
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</p>
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<a name="boost_functional_overloadedfunction.Tutorial.overloading"></a><a class="link" href="Tutorial.html#boost_functional_overloadedfunction.Tutorial.overloading" title="Overloading">Overloading</a>
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<a name="boost_functional_overloadedfunction.tutorial.overloading"></a><a class="link" href="tutorial.html#boost_functional_overloadedfunction.tutorial.overloading" title="Overloading">Overloading</a>
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Consider the following functions which have distinct signatures:
|
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Then the relative function pointers, function references, or <a href="http://en.wikipedia.org/wiki/Polymorphism_(computer_science)" target="_top">monomorphic
|
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|
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constructor matching the order of the specified template parameters. <sup>[<a name="boost_functional_overloadedfunction.Tutorial.overloading.f0" href="#ftn.boost_functional_overloadedfunction.Tutorial.overloading.f0" class="footnote">2</a>]</sup> In the above example, <code class="computeroutput"><span class="identifier">identity_s</span></code>
|
||||
constructor matching the order of the specified template parameters. <sup>[<a name="boost_functional_overloadedfunction.tutorial.overloading.f0" href="#ftn.boost_functional_overloadedfunction.tutorial.overloading.f0" class="footnote">2</a>]</sup> In the above example, <code class="computeroutput"><span class="identifier">identity_s</span></code>
|
||||
is passed as a function pointer (the function address is automatically taken
|
||||
from the function name by the compiler), <code class="computeroutput"><span class="identifier">identity_i</span></code>
|
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as a function reference, and <code class="computeroutput"><span class="identifier">identity_d</span></code>
|
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|
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</p>
|
||||
<p>
|
||||
All specified function types must have distinct parameters from one another
|
||||
(so the overloaded calls can be resolved by this library). <sup>[<a name="boost_functional_overloadedfunction.Tutorial.overloading.f1" href="#ftn.boost_functional_overloadedfunction.Tutorial.overloading.f1" class="footnote">3</a>]</sup> In order to create an overloaded function object, it is necessary
|
||||
(so the overloaded calls can be resolved by this library). <sup>[<a name="boost_functional_overloadedfunction.tutorial.overloading.f1" href="#ftn.boost_functional_overloadedfunction.tutorial.overloading.f1" class="footnote">3</a>]</sup> In order to create an overloaded function object, it is necessary
|
||||
to specify at least two function types (because there is nothing to overload
|
||||
between one or zero functions).
|
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</p>
|
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<div class="section boost_functional_overloadedfunction_Tutorial_without_function_types">
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<a name="boost_functional_overloadedfunction.Tutorial.without_function_types"></a><a class="link" href="Tutorial.html#boost_functional_overloadedfunction.Tutorial.without_function_types" title="Without Function Types">Without
|
||||
<a name="boost_functional_overloadedfunction.tutorial.without_function_types"></a><a class="link" href="tutorial.html#boost_functional_overloadedfunction.tutorial.without_function_types" title="Without Function Types">Without
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<div class="footnote"><p><sup>[<a id="ftn.boost_functional_overloadedfunction.Tutorial.overloading.f0" href="#boost_functional_overloadedfunction.Tutorial.overloading.f0" class="para">2</a>] </sup>
|
||||
<div class="footnote"><p><sup>[<a id="ftn.boost_functional_overloadedfunction.tutorial.overloading.f0" href="#boost_functional_overloadedfunction.tutorial.overloading.f0" class="para">2</a>] </sup>
|
||||
Function pointers are of the form <code class="literal"><span class="emphasis"><em>result-type </em></span></code><code class="computeroutput"><span class="special">(*)(</span></code><code class="literal"><span class="emphasis"><em>argument1-type</em></span></code><code class="computeroutput"><span class="special">,</span> <span class="special">...)</span></code> (the
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||||
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|
||||
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|
||||
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|
||||
Unfortunately, it is not possible to support polymorphic function objects
|
||||
(see <a href="http://lists.boost.org/Archives/boost/2012/03/191744.php" target="_top">http://lists.boost.org/Archives/boost/2012/03/191744.php</a>).
|
||||
</p></div>
|
||||
<div class="footnote"><p><sup>[<a id="ftn.boost_functional_overloadedfunction.Tutorial.overloading.f1" href="#boost_functional_overloadedfunction.Tutorial.overloading.f1" class="para">3</a>] </sup>
|
||||
<div class="footnote"><p><sup>[<a id="ftn.boost_functional_overloadedfunction.tutorial.overloading.f1" href="#boost_functional_overloadedfunction.tutorial.overloading.f1" class="para">3</a>] </sup>
|
||||
Note that in C++ the function result type is not used for overload resolution
|
||||
(to avoid making the overload resolution context dependent). Therefore,
|
||||
at least one of the function parameters must be distinct for each specified
|
||||
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<td align="center"><a href="../../../../../more/index.htm">More</a></td>
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<div class="toc">
|
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<p><b>Table of Contents</b></p>
|
||||
<dl>
|
||||
<dt><span class="section"><a href="index.html#boost_functional_overloadedfunction.Introduction">Introduction</a></span></dt>
|
||||
<dt><span class="section"><a href="boost_functional_overloadedfunction/Getting_Started.html">Getting
|
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<dt><span class="section"><a href="index.html#boost_functional_overloadedfunction.introduction">Introduction</a></span></dt>
|
||||
<dt><span class="section"><a href="boost_functional_overloadedfunction/getting_started.html">Getting
|
||||
Started</a></span></dt>
|
||||
<dd><dl>
|
||||
<dt><span class="section"><a href="boost_functional_overloadedfunction/Getting_Started.html#boost_functional_overloadedfunction.Getting_Started.compilers_and_platforms">Compilers
|
||||
<dt><span class="section"><a href="boost_functional_overloadedfunction/getting_started.html#boost_functional_overloadedfunction.getting_started.compilers_and_platforms">Compilers
|
||||
and Platforms</a></span></dt>
|
||||
<dt><span class="section"><a href="boost_functional_overloadedfunction/Getting_Started.html#boost_functional_overloadedfunction.Getting_Started.installation">Installation</a></span></dt>
|
||||
<dt><span class="section"><a href="boost_functional_overloadedfunction/getting_started.html#boost_functional_overloadedfunction.getting_started.installation">Installation</a></span></dt>
|
||||
</dl></dd>
|
||||
<dt><span class="section"><a href="boost_functional_overloadedfunction/Tutorial.html">Tutorial</a></span></dt>
|
||||
<dt><span class="section"><a href="boost_functional_overloadedfunction/tutorial.html">Tutorial</a></span></dt>
|
||||
<dd><dl>
|
||||
<dt><span class="section"><a href="boost_functional_overloadedfunction/Tutorial.html#boost_functional_overloadedfunction.Tutorial.overloading">Overloading</a></span></dt>
|
||||
<dt><span class="section"><a href="boost_functional_overloadedfunction/Tutorial.html#boost_functional_overloadedfunction.Tutorial.without_function_types">Without
|
||||
<dt><span class="section"><a href="boost_functional_overloadedfunction/tutorial.html#boost_functional_overloadedfunction.tutorial.overloading">Overloading</a></span></dt>
|
||||
<dt><span class="section"><a href="boost_functional_overloadedfunction/tutorial.html#boost_functional_overloadedfunction.tutorial.without_function_types">Without
|
||||
Function Types</a></span></dt>
|
||||
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<dt><span class="section"><a href="reference.html">Reference</a></span></dt>
|
||||
@@ -55,15 +55,15 @@
|
||||
<dt><span class="section"><a href="reference.html#header.boost.functional.overloaded_function_hpp">Header <boost/functional/overloaded_function.hpp></a></span></dt>
|
||||
<dt><span class="section"><a href="reference.html#header.boost.functional.overloaded_function.config_hpp">Header <boost/functional/overloaded_function/config.hpp></a></span></dt>
|
||||
</dl></dd>
|
||||
<dt><span class="section"><a href="boost_functional_overloadedfunction/Acknowledgments.html">Acknowledgments</a></span></dt>
|
||||
<dt><span class="section"><a href="boost_functional_overloadedfunction/acknowledgments.html">Acknowledgments</a></span></dt>
|
||||
</dl>
|
||||
</div>
|
||||
<p>
|
||||
This library allows to overload different functions into a single function object.
|
||||
</p>
|
||||
<div class="section boost_functional_overloadedfunction_Introduction">
|
||||
<div class="section boost_functional_overloadedfunction_introduction">
|
||||
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
|
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<a name="boost_functional_overloadedfunction.Introduction"></a><a class="link" href="index.html#boost_functional_overloadedfunction.Introduction" title="Introduction">Introduction</a>
|
||||
<a name="boost_functional_overloadedfunction.introduction"></a><a class="link" href="index.html#boost_functional_overloadedfunction.introduction" title="Introduction">Introduction</a>
|
||||
</h2></div></div></div>
|
||||
<p>
|
||||
Consider the following functions which have distinct signatures:
|
||||
@@ -84,7 +84,7 @@
|
||||
<p>
|
||||
Instead of calling them using their separate names (here <code class="computeroutput"><span class="identifier">BOOST_TEST</span></code>
|
||||
is equivalent to <code class="computeroutput"><span class="identifier">assert</span></code>):
|
||||
<sup>[<a name="boost_functional_overloadedfunction.Introduction.f0" href="#ftn.boost_functional_overloadedfunction.Introduction.f0" class="footnote">1</a>]</sup>
|
||||
<sup>[<a name="boost_functional_overloadedfunction.introduction.f0" href="#ftn.boost_functional_overloadedfunction.introduction.f0" class="footnote">1</a>]</sup>
|
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|
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</p>
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@@ -125,7 +125,7 @@
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</div>
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||||
<div class="footnotes">
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||||
<br><hr width="100" align="left">
|
||||
<div class="footnote"><p><sup>[<a id="ftn.boost_functional_overloadedfunction.Introduction.f0" href="#boost_functional_overloadedfunction.Introduction.f0" class="para">1</a>] </sup>
|
||||
<div class="footnote"><p><sup>[<a id="ftn.boost_functional_overloadedfunction.introduction.f0" href="#boost_functional_overloadedfunction.introduction.f0" class="para">1</a>] </sup>
|
||||
In most of the examples presented in this documentation, the Boost.Detail/LightweightTest
|
||||
(<code class="literal">boost/detail/lightweight_test.hpp</code>) macro <code class="computeroutput"><span class="identifier">BOOST_TEST</span></code> is used to check correctness
|
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conditions (conceptually similar to <code class="computeroutput"><span class="identifier">assert</span></code>).
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@@ -138,10 +138,10 @@
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</div>
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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="left"><p><small>Last revised: April 13, 2012 at 00:59:44 GMT</small></p></td>
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<td align="left"><p><small>Last revised: April 28, 2012 at 02:19:13 GMT</small></p></td>
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<td align="right"><div class="copyright-footer"></div></td>
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