cache_aligned_allocator.h

/*
    Copyright 2005-2009 Intel Corporation.  All Rights Reserved.

    The source code contained or described herein and all documents related
    to the source code ("Material") are owned by Intel Corporation or its
    suppliers or licensors.  Title to the Material remains with Intel
    Corporation or its suppliers and licensors.  The Material is protected
    by worldwide copyright laws and treaty provisions.  No part of the
    Material may be used, copied, reproduced, modified, published, uploaded,
    posted, transmitted, distributed, or disclosed in any way without
    Intel's prior express written permission.

    No license under any patent, copyright, trade secret or other
    intellectual property right is granted to or conferred upon you by
    disclosure or delivery of the Materials, either expressly, by
    implication, inducement, estoppel or otherwise.  Any license under such
    intellectual property rights must be express and approved by Intel in
    writing.
*/

#ifndef __TBB_cache_aligned_allocator_H
#define __TBB_cache_aligned_allocator_H

#include <new>
#include "tbb_stddef.h"

namespace tbb {

namespace internal {

    const size_t NFS_MaxLineSize = 128;


    size_t __TBB_EXPORTED_FUNC NFS_GetLineSize();


    void* __TBB_EXPORTED_FUNC NFS_Allocate( size_t n_element, size_t element_size, void* hint );


    void __TBB_EXPORTED_FUNC NFS_Free( void* );
}

#if _MSC_VER && !defined(__INTEL_COMPILER)
    // Workaround for erroneous "unreferenced parameter" warning in method destroy.
    #pragma warning (push)
    #pragma warning (disable: 4100)
#endif


template<typename T>
class cache_aligned_allocator {
public:
    typedef typename internal::allocator_type<T>::value_type value_type;
    typedef value_type* pointer;
    typedef const value_type* const_pointer;
    typedef value_type& reference;
    typedef const value_type& const_reference;
    typedef size_t size_type;
    typedef ptrdiff_t difference_type;
    template<typename U> struct rebind {
        typedef cache_aligned_allocator<U> other;
    };

    cache_aligned_allocator() throw() {}
    cache_aligned_allocator( const cache_aligned_allocator& ) throw() {}
    template<typename U> cache_aligned_allocator(const cache_aligned_allocator<U>&) throw() {}

    pointer address(reference x) const {return &x;}
    const_pointer address(const_reference x) const {return &x;}
    
    pointer allocate( size_type n, const void* hint=0 ) {
        // The "hint" argument is always ignored in NFS_Allocate thus const_cast shouldn't hurt
        return pointer(internal::NFS_Allocate( n, sizeof(value_type), const_cast<void*>(hint) ));
    }

    void deallocate( pointer p, size_type ) {
        internal::NFS_Free(p);
    }

    size_type max_size() const throw() {
        return (~size_t(0)-internal::NFS_MaxLineSize)/sizeof(value_type);
    }

    void construct( pointer p, const value_type& value ) {new(static_cast<void*>(p)) value_type(value);}

    void destroy( pointer p ) {p->~value_type();}
};

#if _MSC_VER && !defined(__INTEL_COMPILER)
    #pragma warning (pop)
#endif // warning 4100 is back


template<> 
class cache_aligned_allocator<void> {
public:
    typedef void* pointer;
    typedef const void* const_pointer;
    typedef void value_type;
    template<typename U> struct rebind {
        typedef cache_aligned_allocator<U> other;
    };
};

template<typename T, typename U>
inline bool operator==( const cache_aligned_allocator<T>&, const cache_aligned_allocator<U>& ) {return true;}

template<typename T, typename U>
inline bool operator!=( const cache_aligned_allocator<T>&, const cache_aligned_allocator<U>& ) {return false;}

} // namespace tbb

#endif /* __TBB_cache_aligned_allocator_H */

---

Copyright © 2005-2009 Intel Corporation. All Rights Reserved.

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