forked from boostorg/functional
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
@@ -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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+13
-595
@@ -1,598 +1,16 @@
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<html>
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<head>
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<title>Chapter 1. Boost.Functional/Factory 1.0</title>
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<div class="titlepage"><div>
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<div><h2 class="title">
|
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<a name="boost_functional_factory"></a>Chapter 1. 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 © 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
|
||||
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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</p>
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</div></div>
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</div></div>
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<div class="toc">
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||||
<p><b>Table of Contents</b></p>
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<dl>
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||||
<dt><span class="section"><a href="index.html#boost_functional_factory.brief_description">Brief Description</a></span></dt>
|
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<dt><span class="section"><a href="index.html#boost_functional_factory.background">Background</a></span></dt>
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<dt><span class="section"><a href="index.html#boost_functional_factory.reference"> Reference</a></span></dt>
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<dt><span class="section"><a href="index.html#boost_functional_factory.acknowledgements">Acknowledgements</a></span></dt>
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<dt><span class="section"><a href="index.html#boost_functional_factory.references">References</a></span></dt>
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</dl>
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</div>
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<div class="section" lang="en">
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<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>
|
||||
|
||||
Reference in New Issue
Block a user