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// Allocators -*- C++ -*- |
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// Copyright (C) 2001-2015 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 3, 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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// Under Section 7 of GPL version 3, you are granted additional |
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// permissions described in the GCC Runtime Library Exception, version |
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// 3.1, as published by the Free Software Foundation. |
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// You should have received a copy of the GNU General Public License and |
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// a copy of the GCC Runtime Library Exception along with this program; |
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
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// . |
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/* |
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* Copyright (c) 1996-1997 |
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* Silicon Graphics Computer Systems, Inc. |
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* |
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* Permission to use, copy, modify, distribute and sell this software |
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* and its documentation for any purpose is hereby granted without fee, |
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* provided that the above copyright notice appear in all copies and |
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* that both that copyright notice and this permission notice appear |
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* in supporting documentation. Silicon Graphics makes no |
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* representations about the suitability of this software for any |
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* purpose. It is provided "as is" without express or implied warranty. |
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*/ |
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/** @file bits/allocator.h |
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* This is an internal header file, included by other library headers. |
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* Do not attempt to use it directly. @headername{memory} |
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*/ |
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#ifndef _ALLOCATOR_H |
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#define _ALLOCATOR_H 1 |
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#include // Define the base class to std::allocator. |
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#include |
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#if __cplusplus >= 201103L |
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#include |
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#endif |
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namespace std _GLIBCXX_VISIBILITY(default) |
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{ |
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_GLIBCXX_BEGIN_NAMESPACE_VERSION |
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/** |
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* @addtogroup allocators |
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* @{ |
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*/ |
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/// allocator specialization. |
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template<> |
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class 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 void* pointer; |
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typedef const void* const_pointer; |
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typedef void value_type; |
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template |
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struct rebind |
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{ typedef allocator<_Tp1> other; }; |
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#if __cplusplus >= 201103L |
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// _GLIBCXX_RESOLVE_LIB_DEFECTS |
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// 2103. std::allocator propagate_on_container_move_assignment |
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typedef true_type propagate_on_container_move_assignment; |
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#endif |
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}; |
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/** |
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* @brief The @a standard allocator, as per [20.4]. |
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* |
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* See https://gcc.gnu.org/onlinedocs/libstdc++/manual/memory.html#std.util.memory.allocator |
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* for further details. |
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* |
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* @tparam _Tp Type of allocated object. |
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*/ |
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template |
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class allocator: public __allocator_base<_Tp> |
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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 |
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struct rebind |
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{ typedef allocator<_Tp1> other; }; |
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#if __cplusplus >= 201103L |
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// _GLIBCXX_RESOLVE_LIB_DEFECTS |
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// 2103. std::allocator propagate_on_container_move_assignment |
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typedef true_type propagate_on_container_move_assignment; |
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#endif |
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allocator() throw() { } |
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allocator(const allocator& __a) throw() |
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: __allocator_base<_Tp>(__a) { } |
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template |
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allocator(const allocator<_Tp1>&) throw() { } |
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~allocator() throw() { } |
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// Inherit everything else. |
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}; |
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template |
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inline bool |
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operator==(const allocator<_T1>&, const allocator<_T2>&) |
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_GLIBCXX_USE_NOEXCEPT |
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{ return true; } |
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template |
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inline bool |
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operator==(const allocator<_Tp>&, const allocator<_Tp>&) |
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_GLIBCXX_USE_NOEXCEPT |
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{ return true; } |
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template |
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inline bool |
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operator!=(const allocator<_T1>&, const allocator<_T2>&) |
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_GLIBCXX_USE_NOEXCEPT |
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{ return false; } |
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template |
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inline bool |
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operator!=(const allocator<_Tp>&, const allocator<_Tp>&) |
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_GLIBCXX_USE_NOEXCEPT |
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{ return false; } |
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/// @} group allocator |
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// Inhibit implicit instantiations for required instantiations, |
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// which are defined via explicit instantiations elsewhere. |
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#if _GLIBCXX_EXTERN_TEMPLATE |
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extern template class allocator; |
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extern template class allocator; |
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#endif |
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159
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// Undefine. |
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#undef __allocator_base |
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// To implement Option 3 of DR 431. |
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template |
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struct __alloc_swap |
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{ static void _S_do_it(_Alloc&, _Alloc&) _GLIBCXX_NOEXCEPT { } }; |
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template |
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struct __alloc_swap<_Alloc, false> |
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{ |
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static void |
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_S_do_it(_Alloc& __one, _Alloc& __two) _GLIBCXX_NOEXCEPT |
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{ |
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// Precondition: swappable allocators. |
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if (__one != __two) |
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swap(__one, __two); |
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} |
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}; |
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179
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// Optimize for stateless allocators. |
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template |
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struct __alloc_neq |
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{ |
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static bool |
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_S_do_it(const _Alloc&, const _Alloc&) |
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{ return false; } |
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}; |
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188
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template |
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struct __alloc_neq<_Alloc, false> |
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{ |
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static bool |
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_S_do_it(const _Alloc& __one, const _Alloc& __two) |
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{ return __one != __two; } |
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}; |
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#if __cplusplus >= 201103L |
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template
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= __or_, |
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is_nothrow_move_constructible>::value> |
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struct __shrink_to_fit_aux |
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{ static bool _S_do_it(_Tp&) noexcept { return false; } }; |
202
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203
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template |
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struct __shrink_to_fit_aux<_Tp, true> |
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{ |
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static bool |
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_S_do_it(_Tp& __c) noexcept |
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{ |
209
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#if __cpp_exceptions |
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try |
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{ |
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_Tp(__make_move_if_noexcept_iterator(__c.begin()), |
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__make_move_if_noexcept_iterator(__c.end()), |
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__c.get_allocator()).swap(__c); |
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return true; |
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} |
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catch(...) |
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{ return false; } |
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#else |
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return false; |
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#endif |
222
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} |
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}; |
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#endif |
225
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226
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_GLIBCXX_END_NAMESPACE_VERSION |
227
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} // namespace std |
228
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229
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#endif |