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Diffstat (limited to 'libstdc++/include/ext/array_allocator.h')
| -rw-r--r-- | libstdc++/include/ext/array_allocator.h | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/libstdc++/include/ext/array_allocator.h b/libstdc++/include/ext/array_allocator.h new file mode 100644 index 0000000..0bbd97a --- /dev/null +++ b/libstdc++/include/ext/array_allocator.h @@ -0,0 +1,149 @@ +// array allocator -*- C++ -*- + +// Copyright (C) 2004, 2005, 2006 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/array_allocator.h + * This file is a GNU extension to the Standard C++ Library. + */ + +#ifndef _ARRAY_ALLOCATOR_H +#define _ARRAY_ALLOCATOR_H 1 + +#include <cstddef> +#include <new> +#include <bits/functexcept.h> +#include <tr1/array> + +_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx) + + using std::size_t; + using std::ptrdiff_t; + + /// @brief Base class. + template<typename _Tp> + class array_allocator_base + { + 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; + + pointer + address(reference __x) const { return &__x; } + + const_pointer + address(const_reference __x) const { return &__x; } + + void + deallocate(pointer, size_type) + { + // Does nothing. + } + + 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(); } + }; + + /** + * @brief An allocator that uses previously allocated memory. + * This memory can be externally, globally, or otherwise allocated. + */ + template<typename _Tp, typename _Array = std::tr1::array<_Tp, 1> > + class array_allocator : public array_allocator_base<_Tp> + { + 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; + typedef _Array array_type; + + private: + array_type* _M_array; + size_type _M_used; + + public: + template<typename _Tp1, typename _Array1 = _Array> + struct rebind + { typedef array_allocator<_Tp1, _Array1> other; }; + + array_allocator(array_type* __array = NULL) throw() + : _M_array(__array), _M_used(size_type()) { } + + array_allocator(const array_allocator& __o) throw() + : _M_array(__o._M_array), _M_used(__o._M_used) { } + + template<typename _Tp1, typename _Array1> + array_allocator(const array_allocator<_Tp1, _Array1>&) throw() + : _M_array(NULL), _M_used(size_type()) { } + + ~array_allocator() throw() { } + + pointer + allocate(size_type __n, const void* = 0) + { + if (_M_array == 0 || _M_used + __n > _M_array->size()) + std::__throw_bad_alloc(); + pointer __ret = _M_array->begin() + _M_used; + _M_used += __n; + return __ret; + } + }; + + template<typename _Tp, typename _Array> + inline bool + operator==(const array_allocator<_Tp, _Array>&, + const array_allocator<_Tp, _Array>&) + { return true; } + + template<typename _Tp, typename _Array> + inline bool + operator!=(const array_allocator<_Tp, _Array>&, + const array_allocator<_Tp, _Array>&) + { return false; } + +_GLIBCXX_END_NAMESPACE + +#endif |
