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40dcc810e7 Branch for development of boost.system related changes
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2007-11-08 14:20:16 +00:00
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<p> <p>
Because <code class="computeroutput"><span class="identifier">T</span></code> might be of reference Because <code class="computeroutput"><span class="identifier">T</span></code> might be of reference
type, in the sequel, those entries whose semantic depends on <code class="computeroutput"><span class="identifier">T</span></code> being of reference type or not will be type, in the sequel, those entries whose semantic depends on <code class="computeroutput"><span class="identifier">T</span></code> being of reference type or not will be
distinguished using the following convention: distinguished using the following convention: * If the entry reads: <code class="computeroutput"><span class="identifier">optional</span><span class="special">&lt;</span><span class="identifier">T</span></code><span class="emphasis"><em>(not a ref)</em></span><code class="computeroutput"><span class="special">&gt;</span></code>, the description corresponds only to the
case where <code class="computeroutput"><span class="identifier">T</span></code> is not of reference
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<li>
If the entry reads: <code class="computeroutput"><span class="identifier">optional</span><span class="special">&lt;</span><span class="identifier">T</span></code><span class="emphasis"><em>(not
a ref)</em></span><code class="computeroutput"><span class="special">&gt;</span></code>, the description
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The following section contains various <code class="computeroutput"><span class="identifier">assert</span><span class="special">()</span></code> which are used only to show the postconditions <p>
as sample code. It is not implied that the type <code class="computeroutput"><span class="identifier">T</span></code> </p>
must support each particular expression but that if the expression is supported, <p>
the implied condition holds. The following section contains various <code class="computeroutput"><span class="identifier">assert</span><span class="special">()</span></code> which are used only to show the postconditions
</p></td></tr> as sample code. It is not implied that the type <code class="computeroutput"><span class="identifier">T</span></code>
must support each particular expression but that if the expression is supported,
the implied condition holds.
</p>
<p>
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class member functions</a> class member functions</a>
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@ -1340,7 +1334,7 @@
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<a href="detailed_semantics.html#boost_optional.detailed_semantics.free_functions">Free functions</a> <a href="detailed_semantics.html#boost_optional.detailed_semantics.free_functions">Free functions</a>
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@ -292,7 +292,7 @@
itself which are supported by a special interface. itself which are supported by a special interface.
</p> </p>
<a name="boost_optional.development.the_interface.lexically_hinted_value_access_in_the_presence_of_possibly_untitialized_optional_objects__the_operators___and___gt_"></a><h5> <a name="boost_optional.development.the_interface.lexically_hinted_value_access_in_the_presence_of_possibly_untitialized_optional_objects__the_operators___and___gt_"></a><h5>
<a name="id2615375"></a> <a name="id2615242"></a>
<a href="development.html#boost_optional.development.the_interface.lexically_hinted_value_access_in_the_presence_of_possibly_untitialized_optional_objects__the_operators___and___gt_">Lexically-hinted <a href="development.html#boost_optional.development.the_interface.lexically_hinted_value_access_in_the_presence_of_possibly_untitialized_optional_objects__the_operators___and___gt_">Lexically-hinted
Value Access in the presence of possibly untitialized optional objects: The Value Access in the presence of possibly untitialized optional objects: The
operators * and -&gt;</a> operators * and -&gt;</a>
@ -357,7 +357,7 @@
incarnated by pointers. incarnated by pointers.
</p> </p>
<a name="boost_optional.development.the_interface.optional_lt_t_gt__as_a_model_of_optionalpointee"></a><h5> <a name="boost_optional.development.the_interface.optional_lt_t_gt__as_a_model_of_optionalpointee"></a><h5>
<a name="id2615714"></a> <a name="id2615580"></a>
<a href="development.html#boost_optional.development.the_interface.optional_lt_t_gt__as_a_model_of_optionalpointee">Optional&lt;T&gt; <a href="development.html#boost_optional.development.the_interface.optional_lt_t_gt__as_a_model_of_optionalpointee">Optional&lt;T&gt;
as a model of OptionalPointee</a> as a model of OptionalPointee</a>
</h5> </h5>
@ -369,12 +369,19 @@
</p> </p>
<div class="warning"><table border="0" summary="Warning"> <div class="warning"><table border="0" summary="Warning">
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However, it is particularly important to note that <code class="computeroutput"><span class="identifier">optional</span><span class="special">&lt;&gt;</span></code> objects are not pointers. <span class="underline"><code class="computeroutput"><span class="identifier">optional</span><span class="special">&lt;&gt;</span></code> is not, and does not model, a pointer</span>. <p>
</p></td></tr> </p>
<p>
However, it is particularly important to note that <code class="computeroutput"><span class="identifier">optional</span><span class="special">&lt;&gt;</span></code> objects are not pointers. <span class="underline"><code class="computeroutput"><span class="identifier">optional</span><span class="special">&lt;&gt;</span></code> is not, and does not model, a
pointer</span>.
</p>
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</p>
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<p> <p>
For instance, <code class="computeroutput"><span class="identifier">optional</span><span class="special">&lt;&gt;</span></code> For instance, <code class="computeroutput"><span class="identifier">optional</span><span class="special">&lt;&gt;</span></code>
@ -398,15 +405,11 @@
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@ -116,7 +116,7 @@
<span class="special">}</span> <span class="special">}</span>
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<a name="boost_optional.exception_safety_guarantees.swap"></a><h4> <a name="boost_optional.exception_safety_guarantees.swap"></a><h4>
<a name="id2644478"></a> <a name="id2644335"></a>
<a href="exception_safety_guarantees.html#boost_optional.exception_safety_guarantees.swap">Swap</a> <a href="exception_safety_guarantees.html#boost_optional.exception_safety_guarantees.swap">Swap</a>
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optional&lt;bool&gt;"> optional&lt;bool&gt;">
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<span class="identifier">assert</span><span class="special">(</span><span class="identifier">b</span><span class="special">==</span><span class="number">3</span><span class="special">);</span> <span class="identifier">assert</span><span class="special">(</span><span class="identifier">b</span><span class="special">==</span><span class="number">3</span><span class="special">);</span>
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expensive unnecessary default construction</a></span></dt>
</dl></dd>
<dt><span class="section"><a href="boost_optional/optional_references.html">Optional references</a></span></dt> <dt><span class="section"><a href="boost_optional/optional_references.html">Optional references</a></span></dt>
<dt><span class="section"><a href="boost_optional/rebinding_semantics_for_assignment_of_optional_references.html">Rebinding <dt><span class="section"><a href="boost_optional/rebinding_semantics_for_assignment_of_optional_references.html">Rebinding
semantics for assignment of optional references</a></span></dt> semantics for assignment of optional references</a></span></dt>
@ -174,10 +159,10 @@
</p> </p>
</div> </div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"><p><small>Last revised: February 12, 2008 at 22:47:14 GMT</small></p></td> <td align="left"><small><p>Last revised: May 29, 2007 at 06:31:03 GMT</p></small></td>
<td align="right"><div class="copyright-footer"></div></td> <td align="right"><small></small></td>
</tr></table> </tr></table>
<hr> <hr>
<div class="spirit-nav"><a accesskey="n" href="boost_optional/development.html"><img src="../../../../doc/html/images/next.png" alt="Next"></a></div> <div class="spirit-nav"><a accesskey="n" href="boost_optional/development.html"><img src="images/next.png" alt="Next"></a></div>
</body> </body>
</html> </html>

1803
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@ -22,7 +22,7 @@ Distributed under the Boost Software License, Version 1.0.
[/ Cited Boost resources ] [/ Cited Boost resources ]
[def __BOOST_VARIANT__ [@../../../variant/index.html Boost.Variant]] [def __BOOST_VARIANT__ [@../../../variant/index.html Boost.Variant]]
[def __BOOST_TRIBOOL__ [@../../../../doc/html/tribool.html boost::tribool]] [def __BOOST_TRIBOOL__ [@../../../tribool/index.html boost::tribool]]
[def __OPTIONAL_POINTEE__ [@../../../utility/OptionalPointee.html OptionalPointee]] [def __OPTIONAL_POINTEE__ [@../../../utility/OptionalPointee.html OptionalPointee]]
[def __COPY_CONSTRUCTIBLE__ [@../../../utility/CopyConstructible.html Copy Constructible]] [def __COPY_CONSTRUCTIBLE__ [@../../../utility/CopyConstructible.html Copy Constructible]]
@ -40,6 +40,11 @@ Distributed under the Boost Software License, Version 1.0.
[/ Icons ] [/ Icons ]
[def __NOTE__ [$images/note.png]]
[def __ALERT__ [$images/caution.png]]
[def __DETAIL__ [$images/note.png]]
[def __TIP__ [$images/tip.png]]
[def __QUESTION_MARK__ [$images/question.png]]
[def __SPACE__ [$images/space.png]] [def __SPACE__ [$images/space.png]]
[def __GO_TO__ [$images/callouts/R.png]] [def __GO_TO__ [$images/callouts/R.png]]

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@ -126,7 +126,6 @@
Because `T` might be of reference type, in the sequel, those entries whose Because `T` might be of reference type, in the sequel, those entries whose
semantic depends on `T` being of reference type or not will be distinguished semantic depends on `T` being of reference type or not will be distinguished
using the following convention: using the following convention:
* If the entry reads: `optional<T`['(not a ref)]`>`, the description * If the entry reads: `optional<T`['(not a ref)]`>`, the description
corresponds only to the case where `T` is not of reference type. corresponds only to the case where `T` is not of reference type.
* If the entry reads: `optional<T&>`, the description corresponds only to * If the entry reads: `optional<T&>`, the description corresponds only to

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@ -4,7 +4,7 @@
// (See accompanying file LICENSE_1_0.txt or copy at // (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt) // http://www.boost.org/LICENSE_1_0.txt)
// //
// See http://www.boost.org/libs/optional for documentation. // See http://www.boost.org/lib/optional/ for documentation.
// //
// You are welcome to contact the author at: // You are welcome to contact the author at:
// fernando_cacciola@hotmail.com // fernando_cacciola@hotmail.com

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@ -4,7 +4,7 @@
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt) // http://www.boost.org/LICENSE_1_0.txt)
// //
// See http://www.boost.org/libs/optional for documentation. // See http://www.boost.org/lib/optional for documentation.
// //
// You are welcome to contact the author at: // You are welcome to contact the author at:
// fernando_cacciola@hotmail.com // fernando_cacciola@hotmail.com

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@ -4,7 +4,7 @@
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt) // http://www.boost.org/LICENSE_1_0.txt)
// //
// See http://www.boost.org/libs/optional for documentation. // See http://www.boost.org/lib/optional for documentation.
// //
// You are welcome to contact the author at: // You are welcome to contact the author at:
// fernando_cacciola@hotmail.com // fernando_cacciola@hotmail.com

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@ -1,4 +1,4 @@
// Copyright (C) 2003, 2008 Fernando Luis Cacciola Carballal. // Copyright (C) 2003, Fernando Luis Cacciola Carballal.
// //
// Use, modification, and distribution is subject to the Boost Software // Use, modification, and distribution is subject to the Boost Software
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
@ -9,9 +9,6 @@
// You are welcome to contact the author at: // You are welcome to contact the author at:
// fernando_cacciola@hotmail.com // fernando_cacciola@hotmail.com
// //
// Revisions:
// 27 Apr 2008 (improved swap) Fernando Cacciola, Niels Dekker, Thorsten Ottosen
//
#ifndef BOOST_OPTIONAL_OPTIONAL_FLC_19NOV2002_HPP #ifndef BOOST_OPTIONAL_OPTIONAL_FLC_19NOV2002_HPP
#define BOOST_OPTIONAL_OPTIONAL_FLC_19NOV2002_HPP #define BOOST_OPTIONAL_OPTIONAL_FLC_19NOV2002_HPP
@ -22,7 +19,6 @@
#include "boost/assert.hpp" #include "boost/assert.hpp"
#include "boost/type.hpp" #include "boost/type.hpp"
#include "boost/type_traits/alignment_of.hpp" #include "boost/type_traits/alignment_of.hpp"
#include "boost/type_traits/has_nothrow_constructor.hpp"
#include "boost/type_traits/type_with_alignment.hpp" #include "boost/type_traits/type_with_alignment.hpp"
#include "boost/type_traits/remove_reference.hpp" #include "boost/type_traits/remove_reference.hpp"
#include "boost/type_traits/is_reference.hpp" #include "boost/type_traits/is_reference.hpp"
@ -32,7 +28,6 @@
#include "boost/detail/reference_content.hpp" #include "boost/detail/reference_content.hpp"
#include "boost/none.hpp" #include "boost/none.hpp"
#include "boost/utility/compare_pointees.hpp" #include "boost/utility/compare_pointees.hpp"
#include "boost/utility/in_place_factory.hpp"
#include "boost/optional/optional_fwd.hpp" #include "boost/optional/optional_fwd.hpp"
@ -521,7 +516,7 @@ class optional : public optional_detail::optional_base<T>
// Creates a deep copy of another optional<T> // Creates a deep copy of another optional<T>
// Can throw if T::T(T const&) does // Can throw if T::T(T const&) does
optional ( optional const& rhs ) : base( static_cast<base const&>(rhs) ) {} optional ( optional const& rhs ) : base(rhs) {}
// No-throw (assuming T::~T() doesn't) // No-throw (assuming T::~T() doesn't)
~optional() {} ~optional() {}
@ -555,7 +550,7 @@ class optional : public optional_detail::optional_base<T>
// (NOTE: On BCB, this operator is not actually called and left is left UNMODIFIED in case of a throw) // (NOTE: On BCB, this operator is not actually called and left is left UNMODIFIED in case of a throw)
optional& operator= ( optional const& rhs ) optional& operator= ( optional const& rhs )
{ {
this->assign( static_cast<base const&>(rhs) ) ; this->assign( rhs ) ;
return *this ; return *this ;
} }
@ -576,14 +571,6 @@ class optional : public optional_detail::optional_base<T>
return *this ; return *this ;
} }
void swap( optional & arg )
{
// allow for Koenig lookup
using boost::swap ;
swap(*this, arg);
}
// Returns a reference to the value if this is initialized, otherwise, // Returns a reference to the value if this is initialized, otherwise,
// the behaviour is UNDEFINED // the behaviour is UNDEFINED
// No-throw // No-throw
@ -891,77 +878,44 @@ namespace optional_detail {
#define BOOST_OPTIONAL_STD_SWAP_INTRODUCED_AT_NS_SCOPE #define BOOST_OPTIONAL_STD_SWAP_INTRODUCED_AT_NS_SCOPE
#endif #endif
template<bool use_default_constructor> struct swap_selector; // optional's swap:
// If both are initialized, calls swap(T&, T&). If this swap throws, both will remain initialized but their values are now unspecified.
template<> // If only one is initialized, calls U.reset(*I), THEN I.reset().
struct swap_selector<true> // If U.reset(*I) throws, both are left UNCHANGED (U is kept uinitialized and I is never reset)
// If both are uninitialized, do nothing (no-throw)
template<class T>
inline
void optional_swap ( optional<T>& x, optional<T>& y )
{
if ( !x && !!y )
{ {
template<class T> x.reset(*y);
static void optional_swap ( optional<T>& x, optional<T>& y ) y.reset();
{ }
bool hasX = x; else if ( !!x && !y )
bool hasY = y; {
y.reset(*x);
if ( !hasX && !hasY ) x.reset();
return; }
else if ( !!x && !!y )
if( !hasX ) {
x = boost::in_place(); // GCC > 3.2 and all other compilers have the using declaration at function scope (FLC)
else if ( !hasY )
y = boost::in_place();
// GCC > 3.2 and all other compilers have the using declaration at function scope (FLC)
#ifndef BOOST_OPTIONAL_STD_SWAP_INTRODUCED_AT_NS_SCOPE #ifndef BOOST_OPTIONAL_STD_SWAP_INTRODUCED_AT_NS_SCOPE
// allow for Koenig lookup // allow for Koenig lookup
using std::swap ; using std::swap ;
#endif #endif
swap(*x,*y); swap(*x,*y);
}
if( !hasX ) }
y = boost::none ;
else if( !hasY )
x = boost::none ;
}
};
template<>
struct swap_selector<false>
{
template<class T>
static void optional_swap ( optional<T>& x, optional<T>& y )
{
if ( !x && !!y )
{
x = *y;
y = boost::none ;
}
else if ( !!x && !y )
{
y = *x ;
x = boost::none ;
}
else if ( !!x && !!y )
{
// GCC > 3.2 and all other compilers have the using declaration at function scope (FLC)
#ifndef BOOST_OPTIONAL_STD_SWAP_INTRODUCED_AT_NS_SCOPE
// allow for Koenig lookup
using std::swap ;
#endif
swap(*x,*y);
}
}
};
} // namespace optional_detail } // namespace optional_detail
template<class T>
struct optional_swap_should_use_default_constructor : has_nothrow_default_constructor<T> {} ;
template<class T> inline void swap ( optional<T>& x, optional<T>& y ) template<class T> inline void swap ( optional<T>& x, optional<T>& y )
{ {
optional_detail::swap_selector<optional_swap_should_use_default_constructor<T>::value>::optional_swap(x, y); optional_detail::optional_swap(x,y);
} }
} // namespace boost } // namespace boost
#endif #endif

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@ -1,4 +1,4 @@
// Copyright (C) 2003, 2008 Fernando Luis Cacciola Carballal. // Copyright (C) 2003, Fernando Luis Cacciola Carballal.
// //
// Use, modification, and distribution is subject to the Boost Software // Use, modification, and distribution is subject to the Boost Software
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
@ -9,9 +9,6 @@
// You are welcome to contact the author at: // You are welcome to contact the author at:
// fernando_cacciola@hotmail.com // fernando_cacciola@hotmail.com
// //
// Revisions:
// 10 May 2008 (added swap related forward declaration) Niels Dekker
//
#ifndef BOOST_OPTIONAL_OPTIONAL_FWD_FLC_19NOV2002_HPP #ifndef BOOST_OPTIONAL_OPTIONAL_FWD_FLC_19NOV2002_HPP
#define BOOST_OPTIONAL_OPTIONAL_FWD_FLC_19NOV2002_HPP #define BOOST_OPTIONAL_OPTIONAL_FWD_FLC_19NOV2002_HPP
@ -19,10 +16,6 @@ namespace boost {
template<class T> class optional ; template<class T> class optional ;
template<class T> void swap ( optional<T>& , optional<T>& ) ;
template<class T> struct optional_swap_should_use_default_constructor ;
} // namespace boost } // namespace boost
#endif #endif

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@ -1,13 +1,13 @@
<html> <html>
<head> <head>
<meta http-equiv="refresh" content="0; URL=doc/html/index.html"> <meta http-equiv="refresh" content="0; URL=doc/optional.html">
</head> </head>
<body> <body>
Automatic redirection failed, please go to Automatic redirection failed, please go to
<a href="doc/html/index.html">doc/html/index.html</a>.&nbsp;<hr> <a href="doc/optional.html">doc/optional.html</a>.&nbsp;<hr>
<p><EFBFBD> Copyright Beman Dawes, 2001</p> <p><EFBFBD> Copyright Beman Dawes, 2001</p>
<p>Distributed under the Boost Software License, Version 1.0. (See accompanying <p>Distributed under the Boost Software License, Version 1.0. (See accompanying
file <a href="../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or copy file <a href="../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or copy
at <a href="http://www.boost.org/LICENSE_1_0.txt">www.boost.org/LICENSE_1_0.txt</a>)</p> at <a href="http://www.boost.org/LICENSE_1_0.txt">www.boost.org/LICENSE_1_0.txt</a>)</p>
</body> </body>
</html> </html>

1
test/.cvsignore Normal file
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@ -0,0 +1 @@
bin

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@ -1,4 +1,4 @@
// Copyright (C) 2003, 2008 Fernando Luis Cacciola Carballal. // Copyright (C) 2003, Fernando Luis Cacciola Carballal.
// //
// Use, modification, and distribution is subject to the Boost Software // Use, modification, and distribution is subject to the Boost Software
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
@ -9,9 +9,6 @@
// You are welcome to contact the author at: // You are welcome to contact the author at:
// fernando_cacciola@hotmail.com // fernando_cacciola@hotmail.com
// //
// Revisions:
// 12 May 2008 (added more swap tests)
//
#include<iostream> #include<iostream>
#include<stdexcept> #include<stdexcept>
#include<string> #include<string>
@ -19,8 +16,6 @@
#define BOOST_ENABLE_ASSERT_HANDLER #define BOOST_ENABLE_ASSERT_HANDLER
#include "boost/bind/apply.hpp" // Included just to test proper interaction with boost::apply<> as reported by Daniel Wallin #include "boost/bind/apply.hpp" // Included just to test proper interaction with boost::apply<> as reported by Daniel Wallin
#include "boost/mpl/bool.hpp"
#include "boost/mpl/bool_fwd.hpp" // For mpl::true_ and mpl::false_
#include "boost/optional/optional.hpp" #include "boost/optional/optional.hpp"
@ -932,337 +927,6 @@ void test_conversions2()
BOOST_CHECK(*get(&opt1) == static_cast<double>(f)); BOOST_CHECK(*get(&opt1) == static_cast<double>(f));
} }
namespace optional_swap_test
{
class default_ctor_exception : public std::exception {} ;
class copy_ctor_exception : public std::exception {} ;
class assignment_exception : public std::exception {} ;
//
// Base class for swap test classes. Its assignment should not be called, when swapping
// optional<T> objects. (The default std::swap would do so.)
//
class base_class_with_forbidden_assignment
{
public:
base_class_with_forbidden_assignment & operator=(const base_class_with_forbidden_assignment &)
{
BOOST_CHECK(!"The assignment should not be used while swapping!");
throw assignment_exception();
}
virtual ~base_class_with_forbidden_assignment() {}
};
//
// Class without default constructor
//
class class_without_default_ctor : public base_class_with_forbidden_assignment
{
public:
char data;
explicit class_without_default_ctor(char arg) : data(arg) {}
};
//
// Class whose default constructor should not be used by optional::swap!
//
class class_whose_default_ctor_should_not_be_used : public base_class_with_forbidden_assignment
{
public:
char data;
explicit class_whose_default_ctor_should_not_be_used(char arg) : data(arg) {}
class_whose_default_ctor_should_not_be_used()
{
BOOST_CHECK(!"This default constructor should not be used while swapping!");
throw default_ctor_exception();
}
};
//
// Class whose default constructor should be used by optional::swap.
// Its copy constructor should be avoided!
//
class class_whose_default_ctor_should_be_used : public base_class_with_forbidden_assignment
{
public:
char data;
explicit class_whose_default_ctor_should_be_used(char arg) : data(arg) { }
class_whose_default_ctor_should_be_used() : data('\0') { }
class_whose_default_ctor_should_be_used(const class_whose_default_ctor_should_be_used &)
{
BOOST_CHECK(!"This copy constructor should not be used while swapping!");
throw copy_ctor_exception();
}
};
//
// Class template whose default constructor should be used by optional::swap.
// Its copy constructor should be avoided!
//
template <class T>
class template_whose_default_ctor_should_be_used : public base_class_with_forbidden_assignment
{
public:
T data;
explicit template_whose_default_ctor_should_be_used(T arg) : data(arg) { }
template_whose_default_ctor_should_be_used() : data('\0') { }
template_whose_default_ctor_should_be_used(const template_whose_default_ctor_should_be_used &)
{
BOOST_CHECK(!"This copy constructor should not be used while swapping!");
throw copy_ctor_exception();
}
};
//
// Class whose explicit constructor should be used by optional::swap.
// Its other constructors should be avoided!
//
class class_whose_explicit_ctor_should_be_used : public base_class_with_forbidden_assignment
{
public:
char data;
explicit class_whose_explicit_ctor_should_be_used(char arg) : data(arg) { }
class_whose_explicit_ctor_should_be_used()
{
BOOST_CHECK(!"This default constructor should not be used while swapping!");
throw default_ctor_exception();
}
class_whose_explicit_ctor_should_be_used(const class_whose_explicit_ctor_should_be_used &)
{
BOOST_CHECK(!"This copy constructor should not be used while swapping!");
throw copy_ctor_exception();
}
};
void swap(class_whose_default_ctor_should_not_be_used & lhs, class_whose_default_ctor_should_not_be_used & rhs)
{
std::swap(lhs.data, rhs.data);
}
void swap(class_whose_default_ctor_should_be_used & lhs, class_whose_default_ctor_should_be_used & rhs)
{
std::swap(lhs.data, rhs.data);
}
void swap(class_without_default_ctor & lhs, class_without_default_ctor & rhs)
{
std::swap(lhs.data, rhs.data);
}
void swap(class_whose_explicit_ctor_should_be_used & lhs, class_whose_explicit_ctor_should_be_used & rhs)
{
std::swap(lhs.data, rhs.data);
}
template <class T>
void swap(template_whose_default_ctor_should_be_used<T> & lhs, template_whose_default_ctor_should_be_used<T> & rhs)
{
std::swap(lhs.data, rhs.data);
}
//
// optional<T>::swap should be customized when neither the copy constructor
// nor the default constructor of T are supposed to be used when swapping, e.g.,
// for the following type T = class_whose_explicit_ctor_should_be_used.
//
void swap(boost::optional<class_whose_explicit_ctor_should_be_used> & x, boost::optional<class_whose_explicit_ctor_should_be_used> & y)
{
bool hasX = x;
bool hasY = y;
if ( !hasX && !hasY )
return;
if( !hasX )
x = boost::in_place('\0');
else if ( !hasY )
y = boost::in_place('\0');
optional_swap_test::swap(*x,*y);
if( !hasX )
y = boost::none ;
else if( !hasY )
x = boost::none ;
}
} // End of namespace optional_swap_test.
namespace boost {
//
// Compile time tweaking on whether or not swap should use the default constructor:
//
template <> struct optional_swap_should_use_default_constructor<
optional_swap_test::class_whose_default_ctor_should_be_used> : mpl::true_ {} ;
template <> struct optional_swap_should_use_default_constructor<
optional_swap_test::class_whose_default_ctor_should_not_be_used> : mpl::false_ {} ;
template <class T> struct optional_swap_should_use_default_constructor<
optional_swap_test::template_whose_default_ctor_should_be_used<T> > : mpl::true_ {} ;
//
// Specialization of boost::swap:
//
template <>
void swap(optional<optional_swap_test::class_whose_explicit_ctor_should_be_used> & x, optional<optional_swap_test::class_whose_explicit_ctor_should_be_used> & y)
{
optional_swap_test::swap(x, y);
}
} // namespace boost
namespace std {
//
// Specializations of std::swap:
//
template <>
void swap(optional_swap_test::class_whose_default_ctor_should_be_used & x, optional_swap_test::class_whose_default_ctor_should_be_used & y)
{
optional_swap_test::swap(x, y);
}
template <>
void swap(optional_swap_test::class_whose_default_ctor_should_not_be_used & x, optional_swap_test::class_whose_default_ctor_should_not_be_used & y)
{
optional_swap_test::swap(x, y);
}
template <>
void swap(optional_swap_test::class_without_default_ctor & x, optional_swap_test::class_without_default_ctor & y)
{
optional_swap_test::swap(x, y);
}
template <>
void swap(optional_swap_test::class_whose_explicit_ctor_should_be_used & x, optional_swap_test::class_whose_explicit_ctor_should_be_used & y)
{
optional_swap_test::swap(x, y);
}
} // namespace std
//
// Tests whether the swap function works properly for optional<T>.
// Assumes that T has one data member, of type char.
// Returns true iff the test is passed.
//
template <class T>
bool test_swap_function( T const* )
{
const boost::unit_test::counter_t counter_before_test = boost::minimal_test::errors_counter();
try
{
optional<T> obj1;
optional<T> obj2('a');
// Self-swap should not have any effect.
swap(obj1, obj1);
swap(obj2, obj2);
BOOST_CHECK(!obj1);
BOOST_CHECK(!!obj2 && obj2->data == 'a');
// Call non-member swap.
swap(obj1, obj2);
// Test if obj1 and obj2 are really swapped.
BOOST_CHECK(!!obj1 && obj1->data == 'a');
BOOST_CHECK(!obj2);
// Call non-member swap one more time.
swap(obj1, obj2);
// Test if obj1 and obj2 are swapped back.
BOOST_CHECK(!obj1);
BOOST_CHECK(!!obj2 && obj2->data == 'a');
}
catch(const std::exception &)
{
// The swap function should not throw, for our test cases.
return false ;
}
return boost::minimal_test::errors_counter() == counter_before_test ;
}
//
// Tests whether the optional<T>::swap member function works properly.
// Assumes that T has one data member, of type char.
// Returns true iff the test is passed.
//
template <class T>
bool test_swap_member_function( T const* )
{
const boost::unit_test::counter_t counter_before_test = boost::minimal_test::errors_counter();
try
{
optional<T> obj1;
optional<T> obj2('a');
// Self-swap should not have any effect.
obj1.swap(obj1);
obj2.swap(obj2);
BOOST_CHECK(!obj1);
BOOST_CHECK(!!obj2 && obj2->data == 'a');
// Call member swap.
obj1.swap(obj2);
// Test if obj1 and obj2 are really swapped.
BOOST_CHECK(!!obj1 && obj1->data == 'a');
BOOST_CHECK(!obj2);
// Call member swap one more time.
obj1.swap(obj2);
// Test if obj1 and obj2 are swapped back.
BOOST_CHECK(!obj1);
BOOST_CHECK(!!obj2 && obj2->data == 'a');
}
catch(const std::exception &)
{
// The optional<T>::swap member function should not throw, for our test cases.
return false ;
}
return boost::minimal_test::errors_counter() == counter_before_test ;
}
//
// Tests compile time tweaking of swap, by means of
// optional_swap_should_use_default_constructor.
//
void test_swap_tweaking()
{
BOOST_CHECK( test_swap_function( ARG(optional_swap_test::class_without_default_ctor) ) );
BOOST_CHECK( test_swap_function( ARG(optional_swap_test::class_whose_default_ctor_should_be_used) ) );
BOOST_CHECK( test_swap_function( ARG(optional_swap_test::class_whose_default_ctor_should_not_be_used) ) );
BOOST_CHECK( test_swap_function( ARG(optional_swap_test::class_whose_explicit_ctor_should_be_used) ) );
BOOST_CHECK( test_swap_function( ARG(optional_swap_test::template_whose_default_ctor_should_be_used<char>) ) );
BOOST_CHECK( test_swap_member_function( ARG(optional_swap_test::class_without_default_ctor) ) );
BOOST_CHECK( test_swap_member_function( ARG(optional_swap_test::class_whose_default_ctor_should_be_used) ) );
BOOST_CHECK( test_swap_member_function( ARG(optional_swap_test::class_whose_default_ctor_should_not_be_used) ) );
BOOST_CHECK( test_swap_member_function( ARG(optional_swap_test::class_whose_explicit_ctor_should_be_used) ) );
BOOST_CHECK( test_swap_member_function( ARG(optional_swap_test::template_whose_default_ctor_should_be_used<char>) ) );
}
int test_main( int, char* [] ) int test_main( int, char* [] )
{ {
try try
@ -1272,7 +936,6 @@ int test_main( int, char* [] )
test_no_implicit_conversions(); test_no_implicit_conversions();
test_conversions1(); test_conversions1();
test_conversions2(); test_conversions2();
test_swap_tweaking();
} }
catch ( ... ) catch ( ... )
{ {