cache_aligned_allocator.h

00001 /*
00002     Copyright 2005-2012 Intel Corporation.  All Rights Reserved.
00003 
00004     The source code contained or described herein and all documents related
00005     to the source code ("Material") are owned by Intel Corporation or its
00006     suppliers or licensors.  Title to the Material remains with Intel
00007     Corporation or its suppliers and licensors.  The Material is protected
00008     by worldwide copyright laws and treaty provisions.  No part of the
00009     Material may be used, copied, reproduced, modified, published, uploaded,
00010     posted, transmitted, distributed, or disclosed in any way without
00011     Intel's prior express written permission.
00012 
00013     No license under any patent, copyright, trade secret or other
00014     intellectual property right is granted to or conferred upon you by
00015     disclosure or delivery of the Materials, either expressly, by
00016     implication, inducement, estoppel or otherwise.  Any license under such
00017     intellectual property rights must be express and approved by Intel in
00018     writing.
00019 */
00020 
00021 #ifndef __TBB_cache_aligned_allocator_H
00022 #define __TBB_cache_aligned_allocator_H
00023 
00024 #include <new>
00025 #include "tbb_stddef.h"
00026 #if __TBB_CPP11_RVALUE_REF_PRESENT && !__TBB_CPP11_STD_FORWARD_BROKEN
00027  #include <utility> // std::forward
00028 #endif
00029 
00030 namespace tbb {
00031 
00033 namespace internal {
00035 
00036     size_t __TBB_EXPORTED_FUNC NFS_GetLineSize();
00037 
00039 
00040     void* __TBB_EXPORTED_FUNC NFS_Allocate( size_t n_element, size_t element_size, void* hint );
00041 
00043 
00045     void __TBB_EXPORTED_FUNC NFS_Free( void* );
00046 }
00048 
00049 #if _MSC_VER && !defined(__INTEL_COMPILER)
00050     // Workaround for erroneous "unreferenced parameter" warning in method destroy.
00051     #pragma warning (push)
00052     #pragma warning (disable: 4100)
00053 #endif
00054 
00056 
00059 template<typename T>
00060 class cache_aligned_allocator {
00061 public:
00062     typedef typename internal::allocator_type<T>::value_type value_type;
00063     typedef value_type* pointer;
00064     typedef const value_type* const_pointer;
00065     typedef value_type& reference;
00066     typedef const value_type& const_reference;
00067     typedef size_t size_type;
00068     typedef ptrdiff_t difference_type;
00069     template<typename U> struct rebind {
00070         typedef cache_aligned_allocator<U> other;
00071     };
00072 
00073     cache_aligned_allocator() throw() {}
00074     cache_aligned_allocator( const cache_aligned_allocator& ) throw() {}
00075     template<typename U> cache_aligned_allocator(const cache_aligned_allocator<U>&) throw() {}
00076 
00077     pointer address(reference x) const {return &x;}
00078     const_pointer address(const_reference x) const {return &x;}
00079     
00081     pointer allocate( size_type n, const void* hint=0 ) {
00082         // The "hint" argument is always ignored in NFS_Allocate thus const_cast shouldn't hurt
00083         return pointer(internal::NFS_Allocate( n, sizeof(value_type), const_cast<void*>(hint) ));
00084     }
00085 
00087     void deallocate( pointer p, size_type ) {
00088         internal::NFS_Free(p);
00089     }
00090 
00092     size_type max_size() const throw() {
00093         return (~size_t(0)-internal::NFS_MaxLineSize)/sizeof(value_type);
00094     }
00095 
00097 #if __TBB_CPP11_VARIADIC_TEMPLATES_PRESENT && __TBB_CPP11_RVALUE_REF_PRESENT
00098     template<typename... Args>
00099     void construct(pointer p, Args&&... args)
00100  #if __TBB_CPP11_STD_FORWARD_BROKEN
00101         { ::new((void *)p) T((args)...); }
00102  #else
00103         { ::new((void *)p) T(std::forward<Args>(args)...); }
00104  #endif
00105 #else // __TBB_CPP11_VARIADIC_TEMPLATES_PRESENT && __TBB_CPP11_RVALUE_REF_PRESENT
00106     void construct( pointer p, const value_type& value ) {::new((void*)(p)) value_type(value);}
00107 #endif // __TBB_CPP11_VARIADIC_TEMPLATES_PRESENT && __TBB_CPP11_RVALUE_REF_PRESENT
00108 
00110     void destroy( pointer p ) {p->~value_type();}
00111 };
00112 
00113 #if _MSC_VER && !defined(__INTEL_COMPILER)
00114     #pragma warning (pop)
00115 #endif // warning 4100 is back
00116 
00118 
00119 template<> 
00120 class cache_aligned_allocator<void> {
00121 public:
00122     typedef void* pointer;
00123     typedef const void* const_pointer;
00124     typedef void value_type;
00125     template<typename U> struct rebind {
00126         typedef cache_aligned_allocator<U> other;
00127     };
00128 };
00129 
00130 template<typename T, typename U>
00131 inline bool operator==( const cache_aligned_allocator<T>&, const cache_aligned_allocator<U>& ) {return true;}
00132 
00133 template<typename T, typename U>
00134 inline bool operator!=( const cache_aligned_allocator<T>&, const cache_aligned_allocator<U>& ) {return false;}
00135 
00136 } // namespace tbb
00137 
00138 #endif /* __TBB_cache_aligned_allocator_H */

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