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- #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
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