| #ifndef BOOST_STATECHART_EXAMPLE_UNIQUE_OBJECT_ALLOCATOR_HPP_INCLUDED |
| #define BOOST_STATECHART_EXAMPLE_UNIQUE_OBJECT_ALLOCATOR_HPP_INCLUDED |
| ////////////////////////////////////////////////////////////////////////////// |
| // Copyright 2002-2006 Andreas Huber Doenni |
| // Distributed under the Boost Software License, Version 1.0. (See accompany- |
| // ing file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
| ////////////////////////////////////////////////////////////////////////////// |
| |
| |
| |
| #include <boost/statechart/detail/avoid_unused_warning.hpp> |
| |
| #include <boost/config.hpp> |
| |
| #ifdef BOOST_MSVC |
| # pragma warning( push ) |
| # pragma warning( disable: 4511 ) // copy constructor could not be generated |
| # pragma warning( disable: 4512 ) // assignment operator could not be generated |
| #endif |
| |
| #include <boost/type_traits/alignment_of.hpp> |
| |
| #ifdef BOOST_MSVC |
| # pragma warning( pop ) |
| #endif |
| |
| #include <boost/type_traits/type_with_alignment.hpp> |
| #include <boost/assert.hpp> |
| |
| #include <cstddef> // size_t |
| |
| |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| template< class T > |
| class UniqueObjectAllocator |
| { |
| public: |
| ////////////////////////////////////////////////////////////////////////// |
| static void * allocate( std::size_t size ) |
| { |
| boost::statechart::detail::avoid_unused_warning( size ); |
| BOOST_ASSERT( !constructed_ && ( size == sizeof( T ) ) ); |
| constructed_ = true; |
| return &storage_.data_[ 0 ]; |
| } |
| |
| static void deallocate( void * p, std::size_t size ) |
| { |
| boost::statechart::detail::avoid_unused_warning( p ); |
| boost::statechart::detail::avoid_unused_warning( size ); |
| BOOST_ASSERT( constructed_ && |
| ( p == &storage_.data_[ 0 ] ) && ( size == sizeof( T ) ) ); |
| constructed_ = false; |
| } |
| |
| private: |
| ////////////////////////////////////////////////////////////////////////// |
| union storage |
| { |
| char data_[ sizeof( T ) ]; |
| typename boost::type_with_alignment< |
| boost::alignment_of< T >::value >::type aligner_; |
| }; |
| |
| static bool constructed_; |
| static storage storage_; |
| }; |
| |
| template< class T > |
| bool UniqueObjectAllocator< T >::constructed_ = false; |
| template< class T > |
| typename UniqueObjectAllocator< T >::storage |
| UniqueObjectAllocator< T >::storage_; |
| |
| |
| |
| #endif |