diff options
Diffstat (limited to 'libstdc++/include/ext/malloc_allocator.h')
| -rw-r--r-- | libstdc++/include/ext/malloc_allocator.h | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/libstdc++/include/ext/malloc_allocator.h b/libstdc++/include/ext/malloc_allocator.h new file mode 100644 index 0000000..0f23e06 --- /dev/null +++ b/libstdc++/include/ext/malloc_allocator.h @@ -0,0 +1,129 @@ +// 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 |
