Line data    Source code

       1             : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
       2             : /*
       3             :  * This file is part of the LibreOffice project.
       4             :  *
       5             :  * This Source Code Form is subject to the terms of the Mozilla Public
       6             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       7             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
       8             :  */
       9             : 
      10             : #ifndef INCLUDED_SC_INC_STLALGORITHM_HXX
      11             : #define INCLUDED_SC_INC_STLALGORITHM_HXX
      12             : 
      13             : #include <functional>
      14             : #include <limits>
      15             : 
      16             : #include <rtl/alloc.h>
      17             : 
      18             : namespace sc {
      19             : 
      20             : /**
      21             :  * Custom allocator for STL container to ensure that the base address of
      22             :  * allocated storage is aligned to a specified boundary.
      23             :  */
      24             : template<typename T, size_t _Alignment>
      25             : class AlignedAllocator
      26             : {
      27             : public:
      28             :     typedef T value_type;
      29             :     typedef size_t size_type;
      30             :     typedef std::ptrdiff_t difference_type;
      31             : 
      32             :     typedef T* pointer;
      33             :     typedef const T* const_pointer;
      34             :     typedef T* void_pointer;
      35             : 
      36             :     typedef T& reference;
      37             :     typedef const T& const_reference;
      38             : 
      39             :     template<typename _Type2>
      40             :     struct rebind
      41             :     {
      42             :         typedef AlignedAllocator<_Type2,_Alignment> other;
      43             :     };
      44             : 
      45          24 :     AlignedAllocator() {}
      46          48 :     ~AlignedAllocator() {}
      47             : 
      48             :     template<typename _Type2>
      49             :     AlignedAllocator(const AlignedAllocator<_Type2,_Alignment>&) {}
      50             : 
      51         196 :     void construct(T* p, const value_type& val) { new(p) value_type(val); }
      52         196 :     void destroy(T* p)
      53             :     {
      54             :         p->~value_type();
      55             :         (void)p; // avoid bogus MSVC '12 "unreferenced formal parameter" warning
      56         196 :     }
      57             : 
      58           8 :     size_type max_size() const
      59             :     {
      60           8 :         return std::numeric_limits<size_type>::max() / sizeof(value_type);
      61             :     }
      62             : 
      63             :     bool operator== (const AlignedAllocator&) const { return true; }
      64             :     bool operator!= (const AlignedAllocator&) const { return false; }
      65             : 
      66          28 :     pointer allocate(size_type n)
      67             :     {
      68          28 :         return (pointer)rtl_allocateAlignedMemory(_Alignment, n*sizeof(value_type));
      69             :     }
      70             : 
      71          28 :     void deallocate(pointer p, size_type)
      72             :     {
      73          28 :         rtl_freeAlignedMemory(p);
      74          28 :     }
      75             : };
      76             : 
      77             : }
      78             : 
      79             : #endif
      80             : 
      81             : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */