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65 lines
1.8 KiB
C++
65 lines
1.8 KiB
C++
#ifndef UNIQUE_OBJECT_ALLOCATOR_HPP_INCLUDED
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#define UNIQUE_OBJECT_ALLOCATOR_HPP_INCLUDED
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//////////////////////////////////////////////////////////////////////////////
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// Copyright (c) 2002-2003 Andreas Huber Doenni, Switzerland
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// Permission to copy, use, modify, sell and distribute this software
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// is granted provided this copyright notice appears in all copies.
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// This software is provided "as is" without express or implied
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// warranty, and with no claim as to its suitability for any purpose.
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//////////////////////////////////////////////////////////////////////////////
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#include <boost/type_traits/alignment_of.hpp>
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#include <boost/type_traits/type_with_alignment.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( size_t size )
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{
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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, size_t size )
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{
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p;
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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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