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01/31/2023 12:38:15 PM
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algorithmfwd.h
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alloc_traits.h
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allocated_ptr.h
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allocator.h
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atomic_base.h
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atomic_futex.h
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atomic_lockfree_defines.h
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basic_ios.h
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basic_ios.tcc
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basic_string.h
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basic_string.tcc
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boost_concept_check.h
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c++0x_warning.h
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char_traits.h
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codecvt.h
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concept_check.h
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cpp_type_traits.h
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cxxabi_forced.h
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cxxabi_init_exception.h
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deque.tcc
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enable_special_members.h
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exception.h
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exception_defines.h
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exception_ptr.h
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forward_list.h
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forward_list.tcc
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fstream.tcc
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functexcept.h
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functional_hash.h
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gslice.h
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gslice_array.h
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hash_bytes.h
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hashtable.h
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hashtable_policy.h
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indirect_array.h
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invoke.h
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ios_base.h
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istream.tcc
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list.tcc
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locale_classes.h
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locale_classes.tcc
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locale_conv.h
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locale_facets.h
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locale_facets.tcc
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locale_facets_nonio.h
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locale_facets_nonio.tcc
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localefwd.h
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mask_array.h
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memoryfwd.h
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move.h
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nested_exception.h
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node_handle.h
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ostream.tcc
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ostream_insert.h
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parse_numbers.h
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postypes.h
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predefined_ops.h
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ptr_traits.h
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quoted_string.h
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random.h
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random.tcc
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range_access.h
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refwrap.h
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regex.h
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regex.tcc
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regex_automaton.h
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regex_automaton.tcc
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regex_compiler.h
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regex_compiler.tcc
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regex_constants.h
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regex_error.h
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regex_executor.h
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regex_executor.tcc
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regex_scanner.h
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regex_scanner.tcc
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shared_ptr.h
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shared_ptr_atomic.h
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shared_ptr_base.h
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slice_array.h
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specfun.h
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sstream.tcc
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std_abs.h
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std_function.h
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std_mutex.h
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stl_algo.h
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stl_algobase.h
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stl_bvector.h
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stl_construct.h
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stl_deque.h
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stl_function.h
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stl_heap.h
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stl_iterator.h
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stl_iterator_base_funcs.h
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stl_iterator_base_types.h
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stl_list.h
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stl_map.h
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stl_multimap.h
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stl_multiset.h
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stl_numeric.h
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stl_pair.h
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stl_queue.h
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stl_raw_storage_iter.h
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stl_relops.h
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stl_set.h
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stl_stack.h
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stl_tempbuf.h
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stl_tree.h
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stl_uninitialized.h
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stl_vector.h
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stream_iterator.h
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streambuf.tcc
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streambuf_iterator.h
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string_view.tcc
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stringfwd.h
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uniform_int_dist.h
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unique_ptr.h
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unordered_map.h
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unordered_set.h
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uses_allocator.h
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valarray_after.h
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valarray_array.h
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valarray_array.tcc
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valarray_before.h
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vector.tcc
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Editing: stl_tempbuf.h
Close
// Temporary buffer implementation -*- C++ -*- // Copyright (C) 2001-2017 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) 1994 * Hewlett-Packard Company * * 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. Hewlett-Packard Company makes no * representations about the suitability of this software for any * purpose. It is provided "as is" without express or implied warranty. * * * 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 bits/stl_tempbuf.h * This is an internal header file, included by other library headers. * Do not attempt to use it directly. @headername{memory} */ #ifndef _STL_TEMPBUF_H #define _STL_TEMPBUF_H 1 #include <bits/stl_algobase.h> #include <bits/stl_construct.h> namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION /** * @brief Allocates a temporary buffer. * @param __len The number of objects of type Tp. * @return See full description. * * Reinventing the wheel, but this time with prettier spokes! * * This function tries to obtain storage for @c __len adjacent Tp * objects. The objects themselves are not constructed, of course. * A pair<> is returned containing <em>the buffer s address and * capacity (in the units of sizeof(_Tp)), or a pair of 0 values if * no storage can be obtained.</em> Note that the capacity obtained * may be less than that requested if the memory is unavailable; * you should compare len with the .second return value. * * Provides the nothrow exception guarantee. */ template<typename _Tp> pair<_Tp*, ptrdiff_t> get_temporary_buffer(ptrdiff_t __len) _GLIBCXX_NOEXCEPT { const ptrdiff_t __max = __gnu_cxx::__numeric_traits<ptrdiff_t>::__max / sizeof(_Tp); if (__len > __max) __len = __max; while (__len > 0) { _Tp* __tmp = static_cast<_Tp*>(::operator new(__len * sizeof(_Tp), std::nothrow)); if (__tmp != 0) return std::pair<_Tp*, ptrdiff_t>(__tmp, __len); __len /= 2; } return std::pair<_Tp*, ptrdiff_t>(static_cast<_Tp*>(0), 0); } /** * @brief The companion to get_temporary_buffer(). * @param __p A buffer previously allocated by get_temporary_buffer. * @return None. * * Frees the memory pointed to by __p. */ template<typename _Tp> inline void return_temporary_buffer(_Tp* __p) { ::operator delete(__p, std::nothrow); } /** * This class is used in two places: stl_algo.h and ext/memory, * where it is wrapped as the temporary_buffer class. See * temporary_buffer docs for more notes. */ template<typename _ForwardIterator, typename _Tp> class _Temporary_buffer { // concept requirements __glibcxx_class_requires(_ForwardIterator, _ForwardIteratorConcept) public: typedef _Tp value_type; typedef value_type* pointer; typedef pointer iterator; typedef ptrdiff_t size_type; protected: size_type _M_original_len; size_type _M_len; pointer _M_buffer; public: /// As per Table mumble. size_type size() const { return _M_len; } /// Returns the size requested by the constructor; may be >size(). size_type requested_size() const { return _M_original_len; } /// As per Table mumble. iterator begin() { return _M_buffer; } /// As per Table mumble. iterator end() { return _M_buffer + _M_len; } /** * Constructs a temporary buffer of a size somewhere between * zero and the size of the given range. */ _Temporary_buffer(_ForwardIterator __first, _ForwardIterator __last); ~_Temporary_buffer() { std::_Destroy(_M_buffer, _M_buffer + _M_len); std::return_temporary_buffer(_M_buffer); } private: // Disable copy constructor and assignment operator. _Temporary_buffer(const _Temporary_buffer&); void operator=(const _Temporary_buffer&); }; template<bool> struct __uninitialized_construct_buf_dispatch { template<typename _Pointer, typename _ForwardIterator> static void __ucr(_Pointer __first, _Pointer __last, _ForwardIterator __seed) { if(__first == __last) return; _Pointer __cur = __first; __try { std::_Construct(std::__addressof(*__first), _GLIBCXX_MOVE(*__seed)); _Pointer __prev = __cur; ++__cur; for(; __cur != __last; ++__cur, ++__prev) std::_Construct(std::__addressof(*__cur), _GLIBCXX_MOVE(*__prev)); *__seed = _GLIBCXX_MOVE(*__prev); } __catch(...) { std::_Destroy(__first, __cur); __throw_exception_again; } } }; template<> struct __uninitialized_construct_buf_dispatch<true> { template<typename _Pointer, typename _ForwardIterator> static void __ucr(_Pointer, _Pointer, _ForwardIterator) { } }; // Constructs objects in the range [first, last). // Note that while these new objects will take valid values, // their exact value is not defined. In particular they may // be 'moved from'. // // While *__seed may be altered during this algorithm, it will have // the same value when the algorithm finishes, unless one of the // constructions throws. // // Requirements: _Pointer::value_type(_Tp&&) is valid. template<typename _Pointer, typename _ForwardIterator> inline void __uninitialized_construct_buf(_Pointer __first, _Pointer __last, _ForwardIterator __seed) { typedef typename std::iterator_traits<_Pointer>::value_type _ValueType; std::__uninitialized_construct_buf_dispatch< __has_trivial_constructor(_ValueType)>:: __ucr(__first, __last, __seed); } template<typename _ForwardIterator, typename _Tp> _Temporary_buffer<_ForwardIterator, _Tp>:: _Temporary_buffer(_ForwardIterator __first, _ForwardIterator __last) : _M_original_len(std::distance(__first, __last)), _M_len(0), _M_buffer(0) { __try { std::pair<pointer, size_type> __p(std::get_temporary_buffer< value_type>(_M_original_len)); _M_buffer = __p.first; _M_len = __p.second; if (_M_buffer) std::__uninitialized_construct_buf(_M_buffer, _M_buffer + _M_len, __first); } __catch(...) { std::return_temporary_buffer(_M_buffer); _M_buffer = 0; _M_len = 0; __throw_exception_again; } } _GLIBCXX_END_NAMESPACE_VERSION } // namespace #endif /* _STL_TEMPBUF_H */