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