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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.5.1/] [libstdc++-v3/] [include/] [bits/] [allocator.h] - Rev 424
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// Allocators -*- C++ -*- // Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 // 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 3, 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. // Under Section 7 of GPL version 3, you are granted additional // permissions described in the GCC Runtime Library Exception, version // 3.1, as published by the Free Software Foundation. // You should have received a copy of the GNU General Public License and // a copy of the GCC Runtime Library Exception along with this program; // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see // <http://www.gnu.org/licenses/>. /* * Copyright (c) 1996-1997 * Silicon Graphics Computer Systems, Inc. * * Permission to use, copy, modify, distribute and sell this software * and its documentation for any purpose is hereby granted without fee, * provided that the above copyright notice appear in all copies and * that both that copyright notice and this permission notice appear * in supporting documentation. Silicon Graphics makes no * representations about the suitability of this software for any * purpose. It is provided "as is" without express or implied warranty. */ /** @file allocator.h * This is an internal header file, included by other library headers. * You should not attempt to use it directly. */ #ifndef _ALLOCATOR_H #define _ALLOCATOR_H 1 // Define the base class to std::allocator. #include <bits/c++allocator.h> _GLIBCXX_BEGIN_NAMESPACE(std) /** * @defgroup allocators Allocators * @ingroup memory * * Classes encapsulating memory operations. */ template<typename _Tp> class allocator; /// allocator<void> specialization. template<> class allocator<void> { public: typedef size_t size_type; typedef ptrdiff_t difference_type; typedef void* pointer; typedef const void* const_pointer; typedef void value_type; template<typename _Tp1> struct rebind { typedef allocator<_Tp1> other; }; }; /** * @brief The @a standard allocator, as per [20.4]. * @ingroup allocators * * Further details: * http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt04ch11.html */ template<typename _Tp> class allocator: public __glibcxx_base_allocator<_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; template<typename _Tp1> struct rebind { typedef allocator<_Tp1> other; }; allocator() throw() { } allocator(const allocator& __a) throw() : __glibcxx_base_allocator<_Tp>(__a) { } template<typename _Tp1> allocator(const allocator<_Tp1>&) throw() { } ~allocator() throw() { } // Inherit everything else. }; template<typename _T1, typename _T2> inline bool operator==(const allocator<_T1>&, const allocator<_T2>&) { return true; } template<typename _Tp> inline bool operator==(const allocator<_Tp>&, const allocator<_Tp>&) { return true; } template<typename _T1, typename _T2> inline bool operator!=(const allocator<_T1>&, const allocator<_T2>&) { return false; } template<typename _Tp> inline bool operator!=(const allocator<_Tp>&, const allocator<_Tp>&) { return false; } // Inhibit implicit instantiations for required instantiations, // which are defined via explicit instantiations elsewhere. // NB: This syntax is a GNU extension. #if _GLIBCXX_EXTERN_TEMPLATE extern template class allocator<char>; extern template class allocator<wchar_t>; #endif // Undefine. #undef __glibcxx_base_allocator // To implement Option 3 of DR 431. template<typename _Alloc, bool = __is_empty(_Alloc)> struct __alloc_swap { static void _S_do_it(_Alloc&, _Alloc&) { } }; template<typename _Alloc> struct __alloc_swap<_Alloc, false> { static void _S_do_it(_Alloc& __one, _Alloc& __two) { // Precondition: swappable allocators. if (__one != __two) swap(__one, __two); } }; // Optimize for stateless allocators. template<typename _Alloc, bool = __is_empty(_Alloc)> struct __alloc_neq { static bool _S_do_it(const _Alloc&, const _Alloc&) { return false; } }; template<typename _Alloc> struct __alloc_neq<_Alloc, false> { static bool _S_do_it(const _Alloc& __one, const _Alloc& __two) { return __one != __two; } }; #ifdef __GXX_EXPERIMENTAL_CXX0X__ // A very basic implementation for now. In general we have to wait for // the availability of the infrastructure described in N2983: we should // try when either T has a move constructor which cannot throw or T is // CopyContructible. // NB: This code doesn't properly belong here, we should find a more // suited place common to std::vector and std::deque. template<typename _Tp, bool = __has_trivial_copy(typename _Tp::value_type)> struct __shrink_to_fit { static void _S_do_it(_Tp&) { } }; template<typename _Tp> struct __shrink_to_fit<_Tp, true> { static void _S_do_it(_Tp& __v) { __try { _Tp(__v).swap(__v); } __catch(...) { } } }; #endif _GLIBCXX_END_NAMESPACE #endif