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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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