| // Allocator that wraps "C" malloc -*- C++ -*- |
| |
| // Copyright (C) 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc. |
| // |
| // This file is part of the GNU ISO C++ Library. This library is free |
| // software; you can redistribute it and/or modify it under the |
| // terms of the GNU General Public License as published by the |
| // Free Software Foundation; either version 2, or (at your option) |
| // any later version. |
| |
| // This library is distributed in the hope that it will be useful, |
| // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| // GNU General Public License for more details. |
| |
| // You should have received a copy of the GNU General Public License along |
| // with this library; see the file COPYING. If not, write to the Free |
| // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, |
| // USA. |
| |
| // As a special exception, you may use this file as part of a free software |
| // library without restriction. Specifically, if other files instantiate |
| // templates or use macros or inline functions from this file, or you compile |
| // this file and link it with other files to produce an executable, this |
| // file does not by itself cause the resulting executable to be covered by |
| // the GNU General Public License. This exception does not however |
| // invalidate any other reasons why the executable file might be covered by |
| // the GNU General Public License. |
| |
| /** @file ext/malloc_allocator.h |
| * This file is a GNU extension to the Standard C++ Library. |
| */ |
| |
| #ifndef _MALLOC_ALLOCATOR_H |
| #define _MALLOC_ALLOCATOR_H 1 |
| |
| #include <cstdlib> |
| #include <new> |
| #include <bits/functexcept.h> |
| |
| _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx) |
| |
| using std::size_t; |
| using std::ptrdiff_t; |
| |
| /** |
| * @brief An allocator that uses malloc. |
| * |
| * This is precisely the allocator defined in the C++ Standard. |
| * - all allocation calls malloc |
| * - all deallocation calls free |
| */ |
| template<typename _Tp> |
| class malloc_allocator |
| { |
| public: |
| typedef size_t size_type; |
| typedef ptrdiff_t difference_type; |
| typedef _Tp* pointer; |
| typedef const _Tp* const_pointer; |
| typedef _Tp& reference; |
| typedef const _Tp& const_reference; |
| typedef _Tp value_type; |
| |
| template<typename _Tp1> |
| struct rebind |
| { typedef malloc_allocator<_Tp1> other; }; |
| |
| malloc_allocator() throw() { } |
| |
| malloc_allocator(const malloc_allocator&) throw() { } |
| |
| template<typename _Tp1> |
| malloc_allocator(const malloc_allocator<_Tp1>&) throw() { } |
| |
| ~malloc_allocator() throw() { } |
| |
| pointer |
| address(reference __x) const { return &__x; } |
| |
| const_pointer |
| address(const_reference __x) const { return &__x; } |
| |
| // NB: __n is permitted to be 0. The C++ standard says nothing |
| // about what the return value is when __n == 0. |
| pointer |
| allocate(size_type __n, const void* = 0) |
| { |
| if (__builtin_expect(__n > this->max_size(), false)) |
| std::__throw_bad_alloc(); |
| |
| pointer __ret = static_cast<_Tp*>(malloc(__n * sizeof(_Tp))); |
| if (!__ret) |
| std::__throw_bad_alloc(); |
| return __ret; |
| } |
| |
| // __p is not permitted to be a null pointer. |
| void |
| deallocate(pointer __p, size_type) |
| { free(static_cast<void*>(__p)); } |
| |
| size_type |
| max_size() const throw() |
| { return size_t(-1) / sizeof(_Tp); } |
| |
| // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| // 402. wrong new expression in [some_] allocator::construct |
| void |
| construct(pointer __p, const _Tp& __val) |
| { ::new(__p) value_type(__val); } |
| |
| void |
| destroy(pointer __p) { __p->~_Tp(); } |
| }; |
| |
| template<typename _Tp> |
| inline bool |
| operator==(const malloc_allocator<_Tp>&, const malloc_allocator<_Tp>&) |
| { return true; } |
| |
| template<typename _Tp> |
| inline bool |
| operator!=(const malloc_allocator<_Tp>&, const malloc_allocator<_Tp>&) |
| { return false; } |
| |
| _GLIBCXX_END_NAMESPACE |
| |
| #endif |