126 lines
3.9 KiB
C++
126 lines
3.9 KiB
C++
// Allocator that wraps "C" malloc -*- C++ -*-
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// Copyright (C) 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 2, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING. If not, write to the Free
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// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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// USA.
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// As a special exception, you may use this file as part of a free software
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// library without restriction. Specifically, if other files instantiate
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// templates or use macros or inline functions from this file, or you compile
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// this file and link it with other files to produce an executable, this
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// file does not by itself cause the resulting executable to be covered by
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// the GNU General Public License. This exception does not however
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// invalidate any other reasons why the executable file might be covered by
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// the GNU General Public License.
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/** @file ext/malloc_allocator.h
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* This file is a GNU extension to the Standard C++ Library.
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*/
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#ifndef _MALLOC_ALLOCATOR_H
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#define _MALLOC_ALLOCATOR_H 1
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#include <cstdlib>
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#include <new>
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#include <bits/functexcept.h>
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namespace __gnu_cxx
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{
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/**
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* @brief An allocator that uses malloc.
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*
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* This is precisely the allocator defined in the C++ Standard.
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* - all allocation calls malloc
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* - all deallocation calls free
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*/
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template<typename _Tp>
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class malloc_allocator
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{
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public:
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typedef size_t size_type;
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typedef ptrdiff_t difference_type;
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typedef _Tp* pointer;
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typedef const _Tp* const_pointer;
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typedef _Tp& reference;
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typedef const _Tp& const_reference;
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typedef _Tp value_type;
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template<typename _Tp1>
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struct rebind
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{ typedef malloc_allocator<_Tp1> other; };
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malloc_allocator() throw() { }
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malloc_allocator(const malloc_allocator&) throw() { }
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template<typename _Tp1>
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malloc_allocator(const malloc_allocator<_Tp1>&) throw() { }
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~malloc_allocator() throw() { }
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pointer
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address(reference __x) const { return &__x; }
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const_pointer
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address(const_reference __x) const { return &__x; }
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// NB: __n is permitted to be 0. The C++ standard says nothing
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// about what the return value is when __n == 0.
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pointer
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allocate(size_type __n, const void* = 0)
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{
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if (__builtin_expect(__n > this->max_size(), false))
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std::__throw_bad_alloc();
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pointer __ret = static_cast<_Tp*>(malloc(__n * sizeof(_Tp)));
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if (!__ret)
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std::__throw_bad_alloc();
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return __ret;
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}
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// __p is not permitted to be a null pointer.
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void
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deallocate(pointer __p, size_type)
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{ free(static_cast<void*>(__p)); }
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size_type
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max_size() const throw()
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{ return size_t(-1) / sizeof(_Tp); }
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// _GLIBCXX_RESOLVE_LIB_DEFECTS
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// 402. wrong new expression in [some_] allocator::construct
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void
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construct(pointer __p, const _Tp& __val)
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{ ::new(__p) value_type(__val); }
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void
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destroy(pointer __p) { __p->~_Tp(); }
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};
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template<typename _Tp>
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inline bool
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operator==(const malloc_allocator<_Tp>&, const malloc_allocator<_Tp>&)
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{ return true; }
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template<typename _Tp>
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inline bool
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operator!=(const malloc_allocator<_Tp>&, const malloc_allocator<_Tp>&)
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{ return false; }
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} // namespace __gnu_cxx
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#endif
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