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authorRemko Tronçon <git@el-tramo.be>2011-03-11 20:22:35 (GMT)
committerRemko Tronçon <git@el-tramo.be>2011-03-11 22:22:04 (GMT)
commit59aa5d7e29ca142ae324ad97e6a5f0353d1a6b89 (patch)
treee450b95ff4c0ba7f770723402a2634773f1a0451 /3rdParty/Boost/src/boost/utility
parent3ff52013d810f94b6095e93f550f58133e2df239 (diff)
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Resolves: #653
Diffstat (limited to '3rdParty/Boost/src/boost/utility')
-rw-r--r--3rdParty/Boost/src/boost/utility/value_init.hpp258
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+// (C) Copyright 2002-2008, Fernando Luis Cacciola Carballal.
+//
+// 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)
+//
+// 21 Ago 2002 (Created) Fernando Cacciola
+// 24 Dec 2007 (Refactored and worked around various compiler bugs) Fernando Cacciola, Niels Dekker
+// 23 May 2008 (Fixed operator= const issue, added initialized_value) Niels Dekker, Fernando Cacciola
+// 21 Ago 2008 (Added swap) Niels Dekker, Fernando Cacciola
+// 20 Feb 2009 (Fixed logical const-ness issues) Niels Dekker, Fernando Cacciola
+// 03 Apr 2010 (Added initialized<T>, suggested by Jeffrey Hellrung, fixing #3472) Niels Dekker
+// 30 May 2010 (Made memset call conditional, fixing #3869) Niels Dekker
+//
+#ifndef BOOST_UTILITY_VALUE_INIT_21AGO2002_HPP
+#define BOOST_UTILITY_VALUE_INIT_21AGO2002_HPP
+
+// Note: The implementation of boost::value_initialized had to deal with the
+// fact that various compilers haven't fully implemented value-initialization.
+// The constructor of boost::value_initialized<T> works around these compiler
+// issues, by clearing the bytes of T, before constructing the T object it
+// contains. More details on these issues are at libs/utility/value_init.htm
+
+#include <boost/aligned_storage.hpp>
+#include <boost/config.hpp> // For BOOST_NO_COMPLETE_VALUE_INITIALIZATION.
+#include <boost/detail/workaround.hpp>
+#include <boost/static_assert.hpp>
+#include <boost/type_traits/cv_traits.hpp>
+#include <boost/type_traits/alignment_of.hpp>
+#include <boost/swap.hpp>
+#include <cstring>
+#include <new>
+
+#ifdef BOOST_MSVC
+#pragma warning(push)
+#if _MSC_VER >= 1310
+// It is safe to ignore the following warning from MSVC 7.1 or higher:
+// "warning C4351: new behavior: elements of array will be default initialized"
+#pragma warning(disable: 4351)
+// It is safe to ignore the following MSVC warning, which may pop up when T is
+// a const type: "warning C4512: assignment operator could not be generated".
+#pragma warning(disable: 4512)
+#endif
+#endif
+
+#ifdef BOOST_NO_COMPLETE_VALUE_INITIALIZATION
+ // Implementation detail: The macro BOOST_DETAIL_VALUE_INIT_WORKAROUND_SUGGESTED
+ // suggests that a workaround should be applied, because of compiler issues
+ // regarding value-initialization.
+ #define BOOST_DETAIL_VALUE_INIT_WORKAROUND_SUGGESTED
+#endif
+
+// Implementation detail: The macro BOOST_DETAIL_VALUE_INIT_WORKAROUND
+// switches the value-initialization workaround either on or off.
+#ifndef BOOST_DETAIL_VALUE_INIT_WORKAROUND
+ #ifdef BOOST_DETAIL_VALUE_INIT_WORKAROUND_SUGGESTED
+ #define BOOST_DETAIL_VALUE_INIT_WORKAROUND 1
+ #else
+ #define BOOST_DETAIL_VALUE_INIT_WORKAROUND 0
+ #endif
+#endif
+
+namespace boost {
+
+template<class T>
+class initialized
+{
+ private :
+ struct wrapper
+ {
+#if !BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x592))
+ typename
+#endif
+ remove_const<T>::type data;
+
+ wrapper()
+ :
+ data()
+ {
+ }
+
+ wrapper(T const & arg)
+ :
+ data(arg)
+ {
+ }
+ };
+
+ mutable
+#if !BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x592))
+ typename
+#endif
+ aligned_storage<sizeof(wrapper), alignment_of<wrapper>::value>::type x;
+
+ wrapper * wrapper_address() const
+ {
+ return static_cast<wrapper *>( static_cast<void*>(&x));
+ }
+
+ public :
+
+ initialized()
+ {
+#if BOOST_DETAIL_VALUE_INIT_WORKAROUND
+ std::memset(&x, 0, sizeof(x));
+#endif
+ new (wrapper_address()) wrapper();
+ }
+
+ initialized(initialized const & arg)
+ {
+ new (wrapper_address()) wrapper( static_cast<wrapper const &>(*(arg.wrapper_address())));
+ }
+
+ explicit initialized(T const & arg)
+ {
+ new (wrapper_address()) wrapper(arg);
+ }
+
+ initialized & operator=(initialized const & arg)
+ {
+ // Assignment is only allowed when T is non-const.
+ BOOST_STATIC_ASSERT( ! is_const<T>::value );
+ *wrapper_address() = static_cast<wrapper const &>(*(arg.wrapper_address()));
+ return *this;
+ }
+
+ ~initialized()
+ {
+ wrapper_address()->wrapper::~wrapper();
+ }
+
+ T const & data() const
+ {
+ return wrapper_address()->data;
+ }
+
+ T& data()
+ {
+ return wrapper_address()->data;
+ }
+
+ void swap(initialized & arg)
+ {
+ ::boost::swap( this->data(), arg.data() );
+ }
+
+ operator T const &() const
+ {
+ return wrapper_address()->data;
+ }
+
+ operator T&()
+ {
+ return wrapper_address()->data;
+ }
+
+} ;
+
+template<class T>
+T const& get ( initialized<T> const& x )
+{
+ return x.data() ;
+}
+
+template<class T>
+T& get ( initialized<T>& x )
+{
+ return x.data() ;
+}
+
+template<class T>
+void swap ( initialized<T> & lhs, initialized<T> & rhs )
+{
+ lhs.swap(rhs) ;
+}
+
+template<class T>
+class value_initialized
+{
+ private :
+
+ // initialized<T> does value-initialization by default.
+ initialized<T> m_data;
+
+ public :
+
+ value_initialized()
+ :
+ m_data()
+ { }
+
+ T const & data() const
+ {
+ return m_data.data();
+ }
+
+ T& data()
+ {
+ return m_data.data();
+ }
+
+ void swap(value_initialized & arg)
+ {
+ m_data.swap(arg.m_data);
+ }
+
+ operator T const &() const
+ {
+ return m_data;
+ }
+
+ operator T&()
+ {
+ return m_data;
+ }
+} ;
+
+
+template<class T>
+T const& get ( value_initialized<T> const& x )
+{
+ return x.data() ;
+}
+
+template<class T>
+T& get ( value_initialized<T>& x )
+{
+ return x.data() ;
+}
+
+template<class T>
+void swap ( value_initialized<T> & lhs, value_initialized<T> & rhs )
+{
+ lhs.swap(rhs) ;
+}
+
+
+class initialized_value_t
+{
+ public :
+
+ template <class T> operator T() const
+ {
+ return initialized<T>().data();
+ }
+};
+
+initialized_value_t const initialized_value = {} ;
+
+
+} // namespace boost
+
+#ifdef BOOST_MSVC
+#pragma warning(pop)
+#endif
+
+#endif