1154 lines
39 KiB
C++
1154 lines
39 KiB
C++
// Core algorithmic facilities -*- C++ -*-
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// Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
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// 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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// <http://www.gnu.org/licenses/>.
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/*
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*
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* Copyright (c) 1994
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* Hewlett-Packard Company
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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. Hewlett-Packard Company 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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*
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* Copyright (c) 1996-1998
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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 stl_algobase.h
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* This is an internal header file, included by other library headers.
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* You should not attempt to use it directly.
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*/
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#ifndef _STL_ALGOBASE_H
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#define _STL_ALGOBASE_H 1
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#include <bits/c++config.h>
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#include <cstddef>
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#include <bits/functexcept.h>
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#include <bits/cpp_type_traits.h>
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#include <ext/type_traits.h>
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#include <ext/numeric_traits.h>
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#include <bits/stl_pair.h>
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#include <bits/stl_iterator_base_types.h>
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#include <bits/stl_iterator_base_funcs.h>
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#include <bits/stl_iterator.h>
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#include <bits/concept_check.h>
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#include <debug/debug.h>
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#include <bits/move.h> // For std::swap and _GLIBCXX_MOVE
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_GLIBCXX_BEGIN_NAMESPACE(std)
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// See http://gcc.gnu.org/ml/libstdc++/2004-08/msg00167.html: in a
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// nutshell, we are partially implementing the resolution of DR 187,
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// when it's safe, i.e., the value_types are equal.
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template<bool _BoolType>
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struct __iter_swap
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{
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template<typename _ForwardIterator1, typename _ForwardIterator2>
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static void
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iter_swap(_ForwardIterator1 __a, _ForwardIterator2 __b)
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{
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typedef typename iterator_traits<_ForwardIterator1>::value_type
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_ValueType1;
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_ValueType1 __tmp = _GLIBCXX_MOVE(*__a);
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*__a = _GLIBCXX_MOVE(*__b);
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*__b = _GLIBCXX_MOVE(__tmp);
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}
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};
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template<>
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struct __iter_swap<true>
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{
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template<typename _ForwardIterator1, typename _ForwardIterator2>
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static void
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iter_swap(_ForwardIterator1 __a, _ForwardIterator2 __b)
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{
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swap(*__a, *__b);
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}
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};
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/**
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* @brief Swaps the contents of two iterators.
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* @ingroup mutating_algorithms
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* @param a An iterator.
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* @param b Another iterator.
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* @return Nothing.
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*
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* This function swaps the values pointed to by two iterators, not the
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* iterators themselves.
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*/
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template<typename _ForwardIterator1, typename _ForwardIterator2>
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inline void
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iter_swap(_ForwardIterator1 __a, _ForwardIterator2 __b)
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{
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typedef typename iterator_traits<_ForwardIterator1>::value_type
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_ValueType1;
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typedef typename iterator_traits<_ForwardIterator2>::value_type
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_ValueType2;
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// concept requirements
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__glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
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_ForwardIterator1>)
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__glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
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_ForwardIterator2>)
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__glibcxx_function_requires(_ConvertibleConcept<_ValueType1,
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_ValueType2>)
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__glibcxx_function_requires(_ConvertibleConcept<_ValueType2,
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_ValueType1>)
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typedef typename iterator_traits<_ForwardIterator1>::reference
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_ReferenceType1;
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typedef typename iterator_traits<_ForwardIterator2>::reference
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_ReferenceType2;
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std::__iter_swap<__are_same<_ValueType1, _ValueType2>::__value
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&& __are_same<_ValueType1&, _ReferenceType1>::__value
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&& __are_same<_ValueType2&, _ReferenceType2>::__value>::
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iter_swap(__a, __b);
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}
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/**
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* @brief Swap the elements of two sequences.
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* @ingroup mutating_algorithms
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* @param first1 A forward iterator.
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* @param last1 A forward iterator.
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* @param first2 A forward iterator.
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* @return An iterator equal to @p first2+(last1-first1).
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*
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* Swaps each element in the range @p [first1,last1) with the
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* corresponding element in the range @p [first2,(last1-first1)).
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* The ranges must not overlap.
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*/
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template<typename _ForwardIterator1, typename _ForwardIterator2>
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_ForwardIterator2
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swap_ranges(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
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_ForwardIterator2 __first2)
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{
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// concept requirements
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__glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
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_ForwardIterator1>)
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__glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
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_ForwardIterator2>)
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__glibcxx_requires_valid_range(__first1, __last1);
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for (; __first1 != __last1; ++__first1, ++__first2)
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std::iter_swap(__first1, __first2);
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return __first2;
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}
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/**
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* @brief This does what you think it does.
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* @ingroup sorting_algorithms
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* @param a A thing of arbitrary type.
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* @param b Another thing of arbitrary type.
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* @return The lesser of the parameters.
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*
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* This is the simple classic generic implementation. It will work on
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* temporary expressions, since they are only evaluated once, unlike a
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* preprocessor macro.
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*/
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template<typename _Tp>
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inline const _Tp&
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min(const _Tp& __a, const _Tp& __b)
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{
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// concept requirements
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__glibcxx_function_requires(_LessThanComparableConcept<_Tp>)
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//return __b < __a ? __b : __a;
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if (__b < __a)
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return __b;
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return __a;
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}
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/**
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* @brief This does what you think it does.
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* @ingroup sorting_algorithms
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* @param a A thing of arbitrary type.
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* @param b Another thing of arbitrary type.
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* @return The greater of the parameters.
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*
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* This is the simple classic generic implementation. It will work on
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* temporary expressions, since they are only evaluated once, unlike a
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* preprocessor macro.
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*/
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template<typename _Tp>
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inline const _Tp&
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max(const _Tp& __a, const _Tp& __b)
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{
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// concept requirements
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__glibcxx_function_requires(_LessThanComparableConcept<_Tp>)
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//return __a < __b ? __b : __a;
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if (__a < __b)
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return __b;
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return __a;
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}
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/**
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* @brief This does what you think it does.
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* @ingroup sorting_algorithms
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* @param a A thing of arbitrary type.
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* @param b Another thing of arbitrary type.
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* @param comp A @link comparison_functors comparison functor@endlink.
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* @return The lesser of the parameters.
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*
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* This will work on temporary expressions, since they are only evaluated
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* once, unlike a preprocessor macro.
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*/
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template<typename _Tp, typename _Compare>
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inline const _Tp&
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min(const _Tp& __a, const _Tp& __b, _Compare __comp)
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{
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//return __comp(__b, __a) ? __b : __a;
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if (__comp(__b, __a))
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return __b;
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return __a;
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}
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/**
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* @brief This does what you think it does.
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* @ingroup sorting_algorithms
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* @param a A thing of arbitrary type.
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* @param b Another thing of arbitrary type.
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* @param comp A @link comparison_functors comparison functor@endlink.
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* @return The greater of the parameters.
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*
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* This will work on temporary expressions, since they are only evaluated
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* once, unlike a preprocessor macro.
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*/
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template<typename _Tp, typename _Compare>
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inline const _Tp&
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max(const _Tp& __a, const _Tp& __b, _Compare __comp)
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{
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//return __comp(__a, __b) ? __b : __a;
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if (__comp(__a, __b))
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return __b;
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return __a;
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}
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// If _Iterator is a __normal_iterator return its base (a plain pointer,
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// normally) otherwise return it untouched. See copy, fill, ...
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template<typename _Iterator,
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bool _IsNormal = __is_normal_iterator<_Iterator>::__value>
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struct __niter_base
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{
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static _Iterator
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__b(_Iterator __it)
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{ return __it; }
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};
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template<typename _Iterator>
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struct __niter_base<_Iterator, true>
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{
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static typename _Iterator::iterator_type
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__b(_Iterator __it)
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{ return __it.base(); }
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};
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// Likewise, for move_iterator.
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template<typename _Iterator,
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bool _IsMove = __is_move_iterator<_Iterator>::__value>
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struct __miter_base
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{
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static _Iterator
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__b(_Iterator __it)
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{ return __it; }
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};
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template<typename _Iterator>
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struct __miter_base<_Iterator, true>
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{
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static typename _Iterator::iterator_type
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__b(_Iterator __it)
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{ return __it.base(); }
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};
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// All of these auxiliary structs serve two purposes. (1) Replace
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// calls to copy with memmove whenever possible. (Memmove, not memcpy,
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// because the input and output ranges are permitted to overlap.)
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// (2) If we're using random access iterators, then write the loop as
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// a for loop with an explicit count.
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template<bool, bool, typename>
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struct __copy_move
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{
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template<typename _II, typename _OI>
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static _OI
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__copy_m(_II __first, _II __last, _OI __result)
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{
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for (; __first != __last; ++__result, ++__first)
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*__result = *__first;
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return __result;
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}
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};
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#ifdef __GXX_EXPERIMENTAL_CXX0X__
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template<typename _Category>
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struct __copy_move<true, false, _Category>
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{
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template<typename _II, typename _OI>
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static _OI
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__copy_m(_II __first, _II __last, _OI __result)
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{
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for (; __first != __last; ++__result, ++__first)
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*__result = std::move(*__first);
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return __result;
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}
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};
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#endif
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template<>
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struct __copy_move<false, false, random_access_iterator_tag>
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{
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template<typename _II, typename _OI>
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static _OI
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__copy_m(_II __first, _II __last, _OI __result)
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{
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typedef typename iterator_traits<_II>::difference_type _Distance;
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for(_Distance __n = __last - __first; __n > 0; --__n)
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{
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*__result = *__first;
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++__first;
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++__result;
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}
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return __result;
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}
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};
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#ifdef __GXX_EXPERIMENTAL_CXX0X__
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template<>
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struct __copy_move<true, false, random_access_iterator_tag>
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{
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template<typename _II, typename _OI>
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static _OI
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__copy_m(_II __first, _II __last, _OI __result)
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{
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typedef typename iterator_traits<_II>::difference_type _Distance;
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for(_Distance __n = __last - __first; __n > 0; --__n)
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{
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*__result = std::move(*__first);
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++__first;
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++__result;
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}
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return __result;
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}
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};
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#endif
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template<bool _IsMove>
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struct __copy_move<_IsMove, true, random_access_iterator_tag>
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{
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template<typename _Tp>
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static _Tp*
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__copy_m(const _Tp* __first, const _Tp* __last, _Tp* __result)
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{
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__builtin_memmove(__result, __first,
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sizeof(_Tp) * (__last - __first));
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return __result + (__last - __first);
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}
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};
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template<bool _IsMove, typename _II, typename _OI>
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inline _OI
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__copy_move_a(_II __first, _II __last, _OI __result)
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{
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typedef typename iterator_traits<_II>::value_type _ValueTypeI;
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typedef typename iterator_traits<_OI>::value_type _ValueTypeO;
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typedef typename iterator_traits<_II>::iterator_category _Category;
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const bool __simple = (__is_pod(_ValueTypeI)
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&& __is_pointer<_II>::__value
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&& __is_pointer<_OI>::__value
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&& __are_same<_ValueTypeI, _ValueTypeO>::__value);
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return std::__copy_move<_IsMove, __simple,
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_Category>::__copy_m(__first, __last, __result);
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}
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// Helpers for streambuf iterators (either istream or ostream).
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// NB: avoid including <iosfwd>, relatively large.
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template<typename _CharT>
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struct char_traits;
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template<typename _CharT, typename _Traits>
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class istreambuf_iterator;
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template<typename _CharT, typename _Traits>
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class ostreambuf_iterator;
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template<bool _IsMove, typename _CharT>
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typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
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ostreambuf_iterator<_CharT, char_traits<_CharT> > >::__type
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__copy_move_a2(_CharT*, _CharT*,
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ostreambuf_iterator<_CharT, char_traits<_CharT> >);
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template<bool _IsMove, typename _CharT>
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typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
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ostreambuf_iterator<_CharT, char_traits<_CharT> > >::__type
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__copy_move_a2(const _CharT*, const _CharT*,
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ostreambuf_iterator<_CharT, char_traits<_CharT> >);
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template<bool _IsMove, typename _CharT>
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typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
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_CharT*>::__type
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__copy_move_a2(istreambuf_iterator<_CharT, char_traits<_CharT> >,
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istreambuf_iterator<_CharT, char_traits<_CharT> >, _CharT*);
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template<bool _IsMove, typename _II, typename _OI>
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inline _OI
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__copy_move_a2(_II __first, _II __last, _OI __result)
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{
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return _OI(std::__copy_move_a<_IsMove>
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(std::__niter_base<_II>::__b(__first),
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std::__niter_base<_II>::__b(__last),
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std::__niter_base<_OI>::__b(__result)));
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}
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/**
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* @brief Copies the range [first,last) into result.
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* @ingroup mutating_algorithms
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* @param first An input iterator.
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* @param last An input iterator.
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* @param result An output iterator.
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* @return result + (first - last)
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*
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* This inline function will boil down to a call to @c memmove whenever
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* possible. Failing that, if random access iterators are passed, then the
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* loop count will be known (and therefore a candidate for compiler
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* optimizations such as unrolling). Result may not be contained within
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* [first,last); the copy_backward function should be used instead.
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*
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* Note that the end of the output range is permitted to be contained
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* within [first,last).
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*/
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template<typename _II, typename _OI>
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inline _OI
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copy(_II __first, _II __last, _OI __result)
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{
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// concept requirements
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__glibcxx_function_requires(_InputIteratorConcept<_II>)
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__glibcxx_function_requires(_OutputIteratorConcept<_OI,
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typename iterator_traits<_II>::value_type>)
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__glibcxx_requires_valid_range(__first, __last);
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return (std::__copy_move_a2<__is_move_iterator<_II>::__value>
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(std::__miter_base<_II>::__b(__first),
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std::__miter_base<_II>::__b(__last), __result));
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}
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#ifdef __GXX_EXPERIMENTAL_CXX0X__
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/**
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* @brief Moves the range [first,last) into result.
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* @ingroup mutating_algorithms
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* @param first An input iterator.
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* @param last An input iterator.
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* @param result An output iterator.
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* @return result + (first - last)
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*
|
|
* This inline function will boil down to a call to @c memmove whenever
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* possible. Failing that, if random access iterators are passed, then the
|
|
* loop count will be known (and therefore a candidate for compiler
|
|
* optimizations such as unrolling). Result may not be contained within
|
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* [first,last); the move_backward function should be used instead.
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*
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|
* Note that the end of the output range is permitted to be contained
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* within [first,last).
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*/
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template<typename _II, typename _OI>
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inline _OI
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move(_II __first, _II __last, _OI __result)
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{
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|
// concept requirements
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|
__glibcxx_function_requires(_InputIteratorConcept<_II>)
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|
__glibcxx_function_requires(_OutputIteratorConcept<_OI,
|
|
typename iterator_traits<_II>::value_type>)
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|
__glibcxx_requires_valid_range(__first, __last);
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return (std::__copy_move_a2<true>
|
|
(std::__miter_base<_II>::__b(__first),
|
|
std::__miter_base<_II>::__b(__last), __result));
|
|
}
|
|
|
|
#define _GLIBCXX_MOVE3(_Tp, _Up, _Vp) std::move(_Tp, _Up, _Vp)
|
|
#else
|
|
#define _GLIBCXX_MOVE3(_Tp, _Up, _Vp) std::copy(_Tp, _Up, _Vp)
|
|
#endif
|
|
|
|
template<bool, bool, typename>
|
|
struct __copy_move_backward
|
|
{
|
|
template<typename _BI1, typename _BI2>
|
|
static _BI2
|
|
__copy_move_b(_BI1 __first, _BI1 __last, _BI2 __result)
|
|
{
|
|
while (__first != __last)
|
|
*--__result = *--__last;
|
|
return __result;
|
|
}
|
|
};
|
|
|
|
#ifdef __GXX_EXPERIMENTAL_CXX0X__
|
|
template<typename _Category>
|
|
struct __copy_move_backward<true, false, _Category>
|
|
{
|
|
template<typename _BI1, typename _BI2>
|
|
static _BI2
|
|
__copy_move_b(_BI1 __first, _BI1 __last, _BI2 __result)
|
|
{
|
|
while (__first != __last)
|
|
*--__result = std::move(*--__last);
|
|
return __result;
|
|
}
|
|
};
|
|
#endif
|
|
|
|
template<>
|
|
struct __copy_move_backward<false, false, random_access_iterator_tag>
|
|
{
|
|
template<typename _BI1, typename _BI2>
|
|
static _BI2
|
|
__copy_move_b(_BI1 __first, _BI1 __last, _BI2 __result)
|
|
{
|
|
typename iterator_traits<_BI1>::difference_type __n;
|
|
for (__n = __last - __first; __n > 0; --__n)
|
|
*--__result = *--__last;
|
|
return __result;
|
|
}
|
|
};
|
|
|
|
#ifdef __GXX_EXPERIMENTAL_CXX0X__
|
|
template<>
|
|
struct __copy_move_backward<true, false, random_access_iterator_tag>
|
|
{
|
|
template<typename _BI1, typename _BI2>
|
|
static _BI2
|
|
__copy_move_b(_BI1 __first, _BI1 __last, _BI2 __result)
|
|
{
|
|
typename iterator_traits<_BI1>::difference_type __n;
|
|
for (__n = __last - __first; __n > 0; --__n)
|
|
*--__result = std::move(*--__last);
|
|
return __result;
|
|
}
|
|
};
|
|
#endif
|
|
|
|
template<bool _IsMove>
|
|
struct __copy_move_backward<_IsMove, true, random_access_iterator_tag>
|
|
{
|
|
template<typename _Tp>
|
|
static _Tp*
|
|
__copy_move_b(const _Tp* __first, const _Tp* __last, _Tp* __result)
|
|
{
|
|
const ptrdiff_t _Num = __last - __first;
|
|
__builtin_memmove(__result - _Num, __first, sizeof(_Tp) * _Num);
|
|
return __result - _Num;
|
|
}
|
|
};
|
|
|
|
template<bool _IsMove, typename _BI1, typename _BI2>
|
|
inline _BI2
|
|
__copy_move_backward_a(_BI1 __first, _BI1 __last, _BI2 __result)
|
|
{
|
|
typedef typename iterator_traits<_BI1>::value_type _ValueType1;
|
|
typedef typename iterator_traits<_BI2>::value_type _ValueType2;
|
|
typedef typename iterator_traits<_BI1>::iterator_category _Category;
|
|
const bool __simple = (__is_pod(_ValueType1)
|
|
&& __is_pointer<_BI1>::__value
|
|
&& __is_pointer<_BI2>::__value
|
|
&& __are_same<_ValueType1, _ValueType2>::__value);
|
|
|
|
return std::__copy_move_backward<_IsMove, __simple,
|
|
_Category>::__copy_move_b(__first,
|
|
__last,
|
|
__result);
|
|
}
|
|
|
|
template<bool _IsMove, typename _BI1, typename _BI2>
|
|
inline _BI2
|
|
__copy_move_backward_a2(_BI1 __first, _BI1 __last, _BI2 __result)
|
|
{
|
|
return _BI2(std::__copy_move_backward_a<_IsMove>
|
|
(std::__niter_base<_BI1>::__b(__first),
|
|
std::__niter_base<_BI1>::__b(__last),
|
|
std::__niter_base<_BI2>::__b(__result)));
|
|
}
|
|
|
|
/**
|
|
* @brief Copies the range [first,last) into result.
|
|
* @ingroup mutating_algorithms
|
|
* @param first A bidirectional iterator.
|
|
* @param last A bidirectional iterator.
|
|
* @param result A bidirectional iterator.
|
|
* @return result - (first - last)
|
|
*
|
|
* The function has the same effect as copy, but starts at the end of the
|
|
* range and works its way to the start, returning the start of the result.
|
|
* This inline function will boil down to a call to @c memmove whenever
|
|
* possible. Failing that, if random access iterators are passed, then the
|
|
* loop count will be known (and therefore a candidate for compiler
|
|
* optimizations such as unrolling).
|
|
*
|
|
* Result may not be in the range [first,last). Use copy instead. Note
|
|
* that the start of the output range may overlap [first,last).
|
|
*/
|
|
template<typename _BI1, typename _BI2>
|
|
inline _BI2
|
|
copy_backward(_BI1 __first, _BI1 __last, _BI2 __result)
|
|
{
|
|
// concept requirements
|
|
__glibcxx_function_requires(_BidirectionalIteratorConcept<_BI1>)
|
|
__glibcxx_function_requires(_Mutable_BidirectionalIteratorConcept<_BI2>)
|
|
__glibcxx_function_requires(_ConvertibleConcept<
|
|
typename iterator_traits<_BI1>::value_type,
|
|
typename iterator_traits<_BI2>::value_type>)
|
|
__glibcxx_requires_valid_range(__first, __last);
|
|
|
|
return (std::__copy_move_backward_a2<__is_move_iterator<_BI1>::__value>
|
|
(std::__miter_base<_BI1>::__b(__first),
|
|
std::__miter_base<_BI1>::__b(__last), __result));
|
|
}
|
|
|
|
#ifdef __GXX_EXPERIMENTAL_CXX0X__
|
|
/**
|
|
* @brief Moves the range [first,last) into result.
|
|
* @ingroup mutating_algorithms
|
|
* @param first A bidirectional iterator.
|
|
* @param last A bidirectional iterator.
|
|
* @param result A bidirectional iterator.
|
|
* @return result - (first - last)
|
|
*
|
|
* The function has the same effect as move, but starts at the end of the
|
|
* range and works its way to the start, returning the start of the result.
|
|
* This inline function will boil down to a call to @c memmove whenever
|
|
* possible. Failing that, if random access iterators are passed, then the
|
|
* loop count will be known (and therefore a candidate for compiler
|
|
* optimizations such as unrolling).
|
|
*
|
|
* Result may not be in the range [first,last). Use move instead. Note
|
|
* that the start of the output range may overlap [first,last).
|
|
*/
|
|
template<typename _BI1, typename _BI2>
|
|
inline _BI2
|
|
move_backward(_BI1 __first, _BI1 __last, _BI2 __result)
|
|
{
|
|
// concept requirements
|
|
__glibcxx_function_requires(_BidirectionalIteratorConcept<_BI1>)
|
|
__glibcxx_function_requires(_Mutable_BidirectionalIteratorConcept<_BI2>)
|
|
__glibcxx_function_requires(_ConvertibleConcept<
|
|
typename iterator_traits<_BI1>::value_type,
|
|
typename iterator_traits<_BI2>::value_type>)
|
|
__glibcxx_requires_valid_range(__first, __last);
|
|
|
|
return (std::__copy_move_backward_a2<true>
|
|
(std::__miter_base<_BI1>::__b(__first),
|
|
std::__miter_base<_BI1>::__b(__last), __result));
|
|
}
|
|
|
|
#define _GLIBCXX_MOVE_BACKWARD3(_Tp, _Up, _Vp) std::move_backward(_Tp, _Up, _Vp)
|
|
#else
|
|
#define _GLIBCXX_MOVE_BACKWARD3(_Tp, _Up, _Vp) std::copy_backward(_Tp, _Up, _Vp)
|
|
#endif
|
|
|
|
template<typename _ForwardIterator, typename _Tp>
|
|
inline typename
|
|
__gnu_cxx::__enable_if<!__is_scalar<_Tp>::__value, void>::__type
|
|
__fill_a(_ForwardIterator __first, _ForwardIterator __last,
|
|
const _Tp& __value)
|
|
{
|
|
for (; __first != __last; ++__first)
|
|
*__first = __value;
|
|
}
|
|
|
|
template<typename _ForwardIterator, typename _Tp>
|
|
inline typename
|
|
__gnu_cxx::__enable_if<__is_scalar<_Tp>::__value, void>::__type
|
|
__fill_a(_ForwardIterator __first, _ForwardIterator __last,
|
|
const _Tp& __value)
|
|
{
|
|
const _Tp __tmp = __value;
|
|
for (; __first != __last; ++__first)
|
|
*__first = __tmp;
|
|
}
|
|
|
|
// Specialization: for char types we can use memset.
|
|
template<typename _Tp>
|
|
inline typename
|
|
__gnu_cxx::__enable_if<__is_byte<_Tp>::__value, void>::__type
|
|
__fill_a(_Tp* __first, _Tp* __last, const _Tp& __c)
|
|
{
|
|
const _Tp __tmp = __c;
|
|
__builtin_memset(__first, static_cast<unsigned char>(__tmp),
|
|
__last - __first);
|
|
}
|
|
|
|
/**
|
|
* @brief Fills the range [first,last) with copies of value.
|
|
* @ingroup mutating_algorithms
|
|
* @param first A forward iterator.
|
|
* @param last A forward iterator.
|
|
* @param value A reference-to-const of arbitrary type.
|
|
* @return Nothing.
|
|
*
|
|
* This function fills a range with copies of the same value. For char
|
|
* types filling contiguous areas of memory, this becomes an inline call
|
|
* to @c memset or @c wmemset.
|
|
*/
|
|
template<typename _ForwardIterator, typename _Tp>
|
|
inline void
|
|
fill(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value)
|
|
{
|
|
// concept requirements
|
|
__glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
|
|
_ForwardIterator>)
|
|
__glibcxx_requires_valid_range(__first, __last);
|
|
|
|
std::__fill_a(std::__niter_base<_ForwardIterator>::__b(__first),
|
|
std::__niter_base<_ForwardIterator>::__b(__last), __value);
|
|
}
|
|
|
|
template<typename _OutputIterator, typename _Size, typename _Tp>
|
|
inline typename
|
|
__gnu_cxx::__enable_if<!__is_scalar<_Tp>::__value, _OutputIterator>::__type
|
|
__fill_n_a(_OutputIterator __first, _Size __n, const _Tp& __value)
|
|
{
|
|
for (; __n > 0; --__n, ++__first)
|
|
*__first = __value;
|
|
return __first;
|
|
}
|
|
|
|
template<typename _OutputIterator, typename _Size, typename _Tp>
|
|
inline typename
|
|
__gnu_cxx::__enable_if<__is_scalar<_Tp>::__value, _OutputIterator>::__type
|
|
__fill_n_a(_OutputIterator __first, _Size __n, const _Tp& __value)
|
|
{
|
|
const _Tp __tmp = __value;
|
|
for (; __n > 0; --__n, ++__first)
|
|
*__first = __tmp;
|
|
return __first;
|
|
}
|
|
|
|
template<typename _Size, typename _Tp>
|
|
inline typename
|
|
__gnu_cxx::__enable_if<__is_byte<_Tp>::__value, _Tp*>::__type
|
|
__fill_n_a(_Tp* __first, _Size __n, const _Tp& __c)
|
|
{
|
|
std::__fill_a(__first, __first + __n, __c);
|
|
return __first + __n;
|
|
}
|
|
|
|
/**
|
|
* @brief Fills the range [first,first+n) with copies of value.
|
|
* @ingroup mutating_algorithms
|
|
* @param first An output iterator.
|
|
* @param n The count of copies to perform.
|
|
* @param value A reference-to-const of arbitrary type.
|
|
* @return The iterator at first+n.
|
|
*
|
|
* This function fills a range with copies of the same value. For char
|
|
* types filling contiguous areas of memory, this becomes an inline call
|
|
* to @c memset or @ wmemset.
|
|
*/
|
|
template<typename _OI, typename _Size, typename _Tp>
|
|
inline _OI
|
|
fill_n(_OI __first, _Size __n, const _Tp& __value)
|
|
{
|
|
// concept requirements
|
|
__glibcxx_function_requires(_OutputIteratorConcept<_OI, _Tp>)
|
|
|
|
return _OI(std::__fill_n_a(std::__niter_base<_OI>::__b(__first),
|
|
__n, __value));
|
|
}
|
|
|
|
template<bool _BoolType>
|
|
struct __equal
|
|
{
|
|
template<typename _II1, typename _II2>
|
|
static bool
|
|
equal(_II1 __first1, _II1 __last1, _II2 __first2)
|
|
{
|
|
for (; __first1 != __last1; ++__first1, ++__first2)
|
|
if (!(*__first1 == *__first2))
|
|
return false;
|
|
return true;
|
|
}
|
|
};
|
|
|
|
template<>
|
|
struct __equal<true>
|
|
{
|
|
template<typename _Tp>
|
|
static bool
|
|
equal(const _Tp* __first1, const _Tp* __last1, const _Tp* __first2)
|
|
{
|
|
return !__builtin_memcmp(__first1, __first2, sizeof(_Tp)
|
|
* (__last1 - __first1));
|
|
}
|
|
};
|
|
|
|
template<typename _II1, typename _II2>
|
|
inline bool
|
|
__equal_aux(_II1 __first1, _II1 __last1, _II2 __first2)
|
|
{
|
|
typedef typename iterator_traits<_II1>::value_type _ValueType1;
|
|
typedef typename iterator_traits<_II2>::value_type _ValueType2;
|
|
const bool __simple = (__is_integer<_ValueType1>::__value
|
|
&& __is_pointer<_II1>::__value
|
|
&& __is_pointer<_II2>::__value
|
|
&& __are_same<_ValueType1, _ValueType2>::__value);
|
|
|
|
return std::__equal<__simple>::equal(__first1, __last1, __first2);
|
|
}
|
|
|
|
|
|
template<typename, typename>
|
|
struct __lc_rai
|
|
{
|
|
template<typename _II1, typename _II2>
|
|
static _II1
|
|
__newlast1(_II1, _II1 __last1, _II2, _II2)
|
|
{ return __last1; }
|
|
|
|
template<typename _II>
|
|
static bool
|
|
__cnd2(_II __first, _II __last)
|
|
{ return __first != __last; }
|
|
};
|
|
|
|
template<>
|
|
struct __lc_rai<random_access_iterator_tag, random_access_iterator_tag>
|
|
{
|
|
template<typename _RAI1, typename _RAI2>
|
|
static _RAI1
|
|
__newlast1(_RAI1 __first1, _RAI1 __last1,
|
|
_RAI2 __first2, _RAI2 __last2)
|
|
{
|
|
const typename iterator_traits<_RAI1>::difference_type
|
|
__diff1 = __last1 - __first1;
|
|
const typename iterator_traits<_RAI2>::difference_type
|
|
__diff2 = __last2 - __first2;
|
|
return __diff2 < __diff1 ? __first1 + __diff2 : __last1;
|
|
}
|
|
|
|
template<typename _RAI>
|
|
static bool
|
|
__cnd2(_RAI, _RAI)
|
|
{ return true; }
|
|
};
|
|
|
|
template<bool _BoolType>
|
|
struct __lexicographical_compare
|
|
{
|
|
template<typename _II1, typename _II2>
|
|
static bool __lc(_II1, _II1, _II2, _II2);
|
|
};
|
|
|
|
template<bool _BoolType>
|
|
template<typename _II1, typename _II2>
|
|
bool
|
|
__lexicographical_compare<_BoolType>::
|
|
__lc(_II1 __first1, _II1 __last1, _II2 __first2, _II2 __last2)
|
|
{
|
|
typedef typename iterator_traits<_II1>::iterator_category _Category1;
|
|
typedef typename iterator_traits<_II2>::iterator_category _Category2;
|
|
typedef std::__lc_rai<_Category1, _Category2> __rai_type;
|
|
|
|
__last1 = __rai_type::__newlast1(__first1, __last1,
|
|
__first2, __last2);
|
|
for (; __first1 != __last1 && __rai_type::__cnd2(__first2, __last2);
|
|
++__first1, ++__first2)
|
|
{
|
|
if (*__first1 < *__first2)
|
|
return true;
|
|
if (*__first2 < *__first1)
|
|
return false;
|
|
}
|
|
return __first1 == __last1 && __first2 != __last2;
|
|
}
|
|
|
|
template<>
|
|
struct __lexicographical_compare<true>
|
|
{
|
|
template<typename _Tp, typename _Up>
|
|
static bool
|
|
__lc(const _Tp* __first1, const _Tp* __last1,
|
|
const _Up* __first2, const _Up* __last2)
|
|
{
|
|
const size_t __len1 = __last1 - __first1;
|
|
const size_t __len2 = __last2 - __first2;
|
|
const int __result = __builtin_memcmp(__first1, __first2,
|
|
std::min(__len1, __len2));
|
|
return __result != 0 ? __result < 0 : __len1 < __len2;
|
|
}
|
|
};
|
|
|
|
template<typename _II1, typename _II2>
|
|
inline bool
|
|
__lexicographical_compare_aux(_II1 __first1, _II1 __last1,
|
|
_II2 __first2, _II2 __last2)
|
|
{
|
|
typedef typename iterator_traits<_II1>::value_type _ValueType1;
|
|
typedef typename iterator_traits<_II2>::value_type _ValueType2;
|
|
const bool __simple =
|
|
(__is_byte<_ValueType1>::__value && __is_byte<_ValueType2>::__value
|
|
&& !__gnu_cxx::__numeric_traits<_ValueType1>::__is_signed
|
|
&& !__gnu_cxx::__numeric_traits<_ValueType2>::__is_signed
|
|
&& __is_pointer<_II1>::__value
|
|
&& __is_pointer<_II2>::__value);
|
|
|
|
return std::__lexicographical_compare<__simple>::__lc(__first1, __last1,
|
|
__first2, __last2);
|
|
}
|
|
|
|
_GLIBCXX_END_NAMESPACE
|
|
|
|
_GLIBCXX_BEGIN_NESTED_NAMESPACE(std, _GLIBCXX_STD_P)
|
|
|
|
/**
|
|
* @brief Tests a range for element-wise equality.
|
|
* @ingroup non_mutating_algorithms
|
|
* @param first1 An input iterator.
|
|
* @param last1 An input iterator.
|
|
* @param first2 An input iterator.
|
|
* @return A boolean true or false.
|
|
*
|
|
* This compares the elements of two ranges using @c == and returns true or
|
|
* false depending on whether all of the corresponding elements of the
|
|
* ranges are equal.
|
|
*/
|
|
template<typename _II1, typename _II2>
|
|
inline bool
|
|
equal(_II1 __first1, _II1 __last1, _II2 __first2)
|
|
{
|
|
// concept requirements
|
|
__glibcxx_function_requires(_InputIteratorConcept<_II1>)
|
|
__glibcxx_function_requires(_InputIteratorConcept<_II2>)
|
|
__glibcxx_function_requires(_EqualOpConcept<
|
|
typename iterator_traits<_II1>::value_type,
|
|
typename iterator_traits<_II2>::value_type>)
|
|
__glibcxx_requires_valid_range(__first1, __last1);
|
|
|
|
return std::__equal_aux(std::__niter_base<_II1>::__b(__first1),
|
|
std::__niter_base<_II1>::__b(__last1),
|
|
std::__niter_base<_II2>::__b(__first2));
|
|
}
|
|
|
|
/**
|
|
* @brief Tests a range for element-wise equality.
|
|
* @ingroup non_mutating_algorithms
|
|
* @param first1 An input iterator.
|
|
* @param last1 An input iterator.
|
|
* @param first2 An input iterator.
|
|
* @param binary_pred A binary predicate @link functors
|
|
* functor@endlink.
|
|
* @return A boolean true or false.
|
|
*
|
|
* This compares the elements of two ranges using the binary_pred
|
|
* parameter, and returns true or
|
|
* false depending on whether all of the corresponding elements of the
|
|
* ranges are equal.
|
|
*/
|
|
template<typename _IIter1, typename _IIter2, typename _BinaryPredicate>
|
|
inline bool
|
|
equal(_IIter1 __first1, _IIter1 __last1,
|
|
_IIter2 __first2, _BinaryPredicate __binary_pred)
|
|
{
|
|
// concept requirements
|
|
__glibcxx_function_requires(_InputIteratorConcept<_IIter1>)
|
|
__glibcxx_function_requires(_InputIteratorConcept<_IIter2>)
|
|
__glibcxx_requires_valid_range(__first1, __last1);
|
|
|
|
for (; __first1 != __last1; ++__first1, ++__first2)
|
|
if (!bool(__binary_pred(*__first1, *__first2)))
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* @brief Performs "dictionary" comparison on ranges.
|
|
* @ingroup sorting_algorithms
|
|
* @param first1 An input iterator.
|
|
* @param last1 An input iterator.
|
|
* @param first2 An input iterator.
|
|
* @param last2 An input iterator.
|
|
* @return A boolean true or false.
|
|
*
|
|
* "Returns true if the sequence of elements defined by the range
|
|
* [first1,last1) is lexicographically less than the sequence of elements
|
|
* defined by the range [first2,last2). Returns false otherwise."
|
|
* (Quoted from [25.3.8]/1.) If the iterators are all character pointers,
|
|
* then this is an inline call to @c memcmp.
|
|
*/
|
|
template<typename _II1, typename _II2>
|
|
inline bool
|
|
lexicographical_compare(_II1 __first1, _II1 __last1,
|
|
_II2 __first2, _II2 __last2)
|
|
{
|
|
// concept requirements
|
|
typedef typename iterator_traits<_II1>::value_type _ValueType1;
|
|
typedef typename iterator_traits<_II2>::value_type _ValueType2;
|
|
__glibcxx_function_requires(_InputIteratorConcept<_II1>)
|
|
__glibcxx_function_requires(_InputIteratorConcept<_II2>)
|
|
__glibcxx_function_requires(_LessThanOpConcept<_ValueType1, _ValueType2>)
|
|
__glibcxx_function_requires(_LessThanOpConcept<_ValueType2, _ValueType1>)
|
|
__glibcxx_requires_valid_range(__first1, __last1);
|
|
__glibcxx_requires_valid_range(__first2, __last2);
|
|
|
|
return std::__lexicographical_compare_aux
|
|
(std::__niter_base<_II1>::__b(__first1),
|
|
std::__niter_base<_II1>::__b(__last1),
|
|
std::__niter_base<_II2>::__b(__first2),
|
|
std::__niter_base<_II2>::__b(__last2));
|
|
}
|
|
|
|
/**
|
|
* @brief Performs "dictionary" comparison on ranges.
|
|
* @ingroup sorting_algorithms
|
|
* @param first1 An input iterator.
|
|
* @param last1 An input iterator.
|
|
* @param first2 An input iterator.
|
|
* @param last2 An input iterator.
|
|
* @param comp A @link comparison_functors comparison functor@endlink.
|
|
* @return A boolean true or false.
|
|
*
|
|
* The same as the four-parameter @c lexicographical_compare, but uses the
|
|
* comp parameter instead of @c <.
|
|
*/
|
|
template<typename _II1, typename _II2, typename _Compare>
|
|
bool
|
|
lexicographical_compare(_II1 __first1, _II1 __last1,
|
|
_II2 __first2, _II2 __last2, _Compare __comp)
|
|
{
|
|
typedef typename iterator_traits<_II1>::iterator_category _Category1;
|
|
typedef typename iterator_traits<_II2>::iterator_category _Category2;
|
|
typedef std::__lc_rai<_Category1, _Category2> __rai_type;
|
|
|
|
// concept requirements
|
|
__glibcxx_function_requires(_InputIteratorConcept<_II1>)
|
|
__glibcxx_function_requires(_InputIteratorConcept<_II2>)
|
|
__glibcxx_requires_valid_range(__first1, __last1);
|
|
__glibcxx_requires_valid_range(__first2, __last2);
|
|
|
|
__last1 = __rai_type::__newlast1(__first1, __last1, __first2, __last2);
|
|
for (; __first1 != __last1 && __rai_type::__cnd2(__first2, __last2);
|
|
++__first1, ++__first2)
|
|
{
|
|
if (__comp(*__first1, *__first2))
|
|
return true;
|
|
if (__comp(*__first2, *__first1))
|
|
return false;
|
|
}
|
|
return __first1 == __last1 && __first2 != __last2;
|
|
}
|
|
|
|
/**
|
|
* @brief Finds the places in ranges which don't match.
|
|
* @ingroup non_mutating_algorithms
|
|
* @param first1 An input iterator.
|
|
* @param last1 An input iterator.
|
|
* @param first2 An input iterator.
|
|
* @return A pair of iterators pointing to the first mismatch.
|
|
*
|
|
* This compares the elements of two ranges using @c == and returns a pair
|
|
* of iterators. The first iterator points into the first range, the
|
|
* second iterator points into the second range, and the elements pointed
|
|
* to by the iterators are not equal.
|
|
*/
|
|
template<typename _InputIterator1, typename _InputIterator2>
|
|
pair<_InputIterator1, _InputIterator2>
|
|
mismatch(_InputIterator1 __first1, _InputIterator1 __last1,
|
|
_InputIterator2 __first2)
|
|
{
|
|
// concept requirements
|
|
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
|
|
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
|
|
__glibcxx_function_requires(_EqualOpConcept<
|
|
typename iterator_traits<_InputIterator1>::value_type,
|
|
typename iterator_traits<_InputIterator2>::value_type>)
|
|
__glibcxx_requires_valid_range(__first1, __last1);
|
|
|
|
while (__first1 != __last1 && *__first1 == *__first2)
|
|
{
|
|
++__first1;
|
|
++__first2;
|
|
}
|
|
return pair<_InputIterator1, _InputIterator2>(__first1, __first2);
|
|
}
|
|
|
|
/**
|
|
* @brief Finds the places in ranges which don't match.
|
|
* @ingroup non_mutating_algorithms
|
|
* @param first1 An input iterator.
|
|
* @param last1 An input iterator.
|
|
* @param first2 An input iterator.
|
|
* @param binary_pred A binary predicate @link functors
|
|
* functor@endlink.
|
|
* @return A pair of iterators pointing to the first mismatch.
|
|
*
|
|
* This compares the elements of two ranges using the binary_pred
|
|
* parameter, and returns a pair
|
|
* of iterators. The first iterator points into the first range, the
|
|
* second iterator points into the second range, and the elements pointed
|
|
* to by the iterators are not equal.
|
|
*/
|
|
template<typename _InputIterator1, typename _InputIterator2,
|
|
typename _BinaryPredicate>
|
|
pair<_InputIterator1, _InputIterator2>
|
|
mismatch(_InputIterator1 __first1, _InputIterator1 __last1,
|
|
_InputIterator2 __first2, _BinaryPredicate __binary_pred)
|
|
{
|
|
// concept requirements
|
|
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
|
|
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
|
|
__glibcxx_requires_valid_range(__first1, __last1);
|
|
|
|
while (__first1 != __last1 && bool(__binary_pred(*__first1, *__first2)))
|
|
{
|
|
++__first1;
|
|
++__first2;
|
|
}
|
|
return pair<_InputIterator1, _InputIterator2>(__first1, __first2);
|
|
}
|
|
|
|
_GLIBCXX_END_NESTED_NAMESPACE
|
|
|
|
// NB: This file is included within many other C++ includes, as a way
|
|
// of getting the base algorithms. So, make sure that parallel bits
|
|
// come in too if requested.
|
|
#ifdef _GLIBCXX_PARALLEL
|
|
# include <parallel/algobase.h>
|
|
#endif
|
|
|
|
#endif
|