821 lines
28 KiB
C++
821 lines
28 KiB
C++
// Bits and pieces used in algorithms -*- C++ -*-
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// Copyright (C) 2001, 2002 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 2, 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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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING. If not, write to the Free
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// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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// USA.
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// As a special exception, you may use this file as part of a free software
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// library without restriction. Specifically, if other files instantiate
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// templates or use macros or inline functions from this file, or you compile
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// this file and link it with other files to produce an executable, this
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// file does not by itself cause the resulting executable to be covered by
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// the GNU General Public License. This exception does not however
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// invalidate any other reasons why the executable file might be covered by
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// the GNU General Public License.
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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 __GLIBCPP_INTERNAL_ALGOBASE_H
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#define __GLIBCPP_INTERNAL_ALGOBASE_H
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#include <bits/c++config.h>
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#include <cstring>
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#include <climits>
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#include <cstdlib>
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#include <cstddef>
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#include <new>
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#include <iosfwd>
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#include <bits/stl_pair.h>
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#include <bits/type_traits.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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namespace std
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{
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// swap and iter_swap
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/**
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* @brief Swaps the contents of two iterators.
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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 _ForwardIter1, typename _ForwardIter2>
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inline void
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iter_swap(_ForwardIter1 __a, _ForwardIter2 __b)
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{
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typedef typename iterator_traits<_ForwardIter1>::value_type _ValueType1;
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typedef typename iterator_traits<_ForwardIter2>::value_type _ValueType2;
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// concept requirements
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__glibcpp_function_requires(_Mutable_ForwardIteratorConcept<_ForwardIter1>)
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__glibcpp_function_requires(_Mutable_ForwardIteratorConcept<_ForwardIter2>)
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__glibcpp_function_requires(_ConvertibleConcept<_ValueType1, _ValueType2>)
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__glibcpp_function_requires(_ConvertibleConcept<_ValueType2, _ValueType1>)
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_ValueType1 __tmp = *__a;
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*__a = *__b;
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*__b = __tmp;
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}
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/**
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* @brief Swaps two values.
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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 Nothing.
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*
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* This is the simple classic generic implementation. It will work on
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* any type which has a copy constructor and an assignment operator.
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*/
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template<typename _Tp>
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inline void
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swap(_Tp& __a, _Tp& __b)
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{
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// concept requirements
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__glibcpp_function_requires(_SGIAssignableConcept<_Tp>)
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_Tp __tmp = __a;
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__a = __b;
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__b = __tmp;
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}
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//--------------------------------------------------
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// min and max
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#undef min
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#undef max
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/**
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* @brief This does what you think it does.
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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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__glibcpp_function_requires(_LessThanComparableConcept<_Tp>)
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//return __b < __a ? __b : __a;
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if (__b < __a) return __b; 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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* @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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__glibcpp_function_requires(_LessThanComparableConcept<_Tp>)
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//return __a < __b ? __b : __a;
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if (__a < __b) return __b; 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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* @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 s20_3_3_comparisons 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)) return __b; 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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* @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 s20_3_3_comparisons 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)) return __b; return __a;
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}
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//--------------------------------------------------
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// copy
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// All of these auxiliary functions 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<typename _InputIter, typename _OutputIter>
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inline _OutputIter
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__copy(_InputIter __first, _InputIter __last,
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_OutputIter __result,
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input_iterator_tag)
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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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template<typename _RandomAccessIter, typename _OutputIter>
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inline _OutputIter
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__copy(_RandomAccessIter __first, _RandomAccessIter __last,
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_OutputIter __result,
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random_access_iterator_tag)
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{
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typedef typename iterator_traits<_RandomAccessIter>::difference_type
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_Distance;
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for (_Distance __n = __last - __first; __n > 0; --__n) {
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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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template<typename _Tp>
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inline _Tp*
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__copy_trivial(const _Tp* __first, const _Tp* __last, _Tp* __result)
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{
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memmove(__result, __first, sizeof(_Tp) * (__last - __first));
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return __result + (__last - __first);
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}
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template<typename _InputIter, typename _OutputIter>
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inline _OutputIter
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__copy_aux2(_InputIter __first, _InputIter __last,
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_OutputIter __result, __false_type)
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{ return __copy(__first, __last, __result, __iterator_category(__first)); }
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template<typename _InputIter, typename _OutputIter>
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inline _OutputIter
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__copy_aux2(_InputIter __first, _InputIter __last,
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_OutputIter __result, __true_type)
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{ return __copy(__first, __last, __result, __iterator_category(__first)); }
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template<typename _Tp>
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inline _Tp*
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__copy_aux2(_Tp* __first, _Tp* __last,
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_Tp* __result, __true_type)
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{ return __copy_trivial(__first, __last, __result); }
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template<typename _Tp>
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inline _Tp*
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__copy_aux2(const _Tp* __first, const _Tp* __last,
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_Tp* __result, __true_type)
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{ return __copy_trivial(__first, __last, __result); }
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template<typename _InputIter, typename _OutputIter>
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inline _OutputIter
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__copy_ni2(_InputIter __first, _InputIter __last,
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_OutputIter __result, __true_type)
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{
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typedef typename iterator_traits<_InputIter>::value_type
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_ValueType;
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typedef typename __type_traits<_ValueType>::has_trivial_assignment_operator
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_Trivial;
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return _OutputIter(__copy_aux2(__first, __last,
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__result.base(),
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_Trivial()));
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}
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template<typename _InputIter, typename _OutputIter>
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inline _OutputIter
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__copy_ni2(_InputIter __first, _InputIter __last,
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_OutputIter __result, __false_type)
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{
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typedef typename iterator_traits<_InputIter>::value_type
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_ValueType;
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typedef typename __type_traits<_ValueType>::has_trivial_assignment_operator
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_Trivial;
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return __copy_aux2(__first, __last,
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__result,
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_Trivial());
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}
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template<typename _InputIter, typename _OutputIter>
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inline _OutputIter
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__copy_ni1(_InputIter __first, _InputIter __last,
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_OutputIter __result, __true_type)
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{
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typedef typename _Is_normal_iterator<_OutputIter>::_Normal __Normal;
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return __copy_ni2(__first.base(), __last.base(), __result, __Normal());
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}
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template<typename _InputIter, typename _OutputIter>
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inline _OutputIter
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__copy_ni1(_InputIter __first, _InputIter __last,
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_OutputIter __result, __false_type)
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{
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typedef typename _Is_normal_iterator<_OutputIter>::_Normal __Normal;
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return __copy_ni2(__first, __last, __result, __Normal());
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}
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/**
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* @brief Copies the range [first,last) into result.
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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). If the input range and the output
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* range overlap, then the copy_backward function should be used instead.
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*/
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template<typename _InputIter, typename _OutputIter>
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inline _OutputIter
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copy(_InputIter __first, _InputIter __last, _OutputIter __result)
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{
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// concept requirements
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__glibcpp_function_requires(_InputIteratorConcept<_InputIter>)
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__glibcpp_function_requires(_OutputIteratorConcept<_OutputIter,
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typename iterator_traits<_InputIter>::value_type>)
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typedef typename _Is_normal_iterator<_InputIter>::_Normal __Normal;
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return __copy_ni1(__first, __last, __result, __Normal());
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}
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//--------------------------------------------------
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// copy_backward
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template<typename _BidirectionalIter1, typename _BidirectionalIter2>
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inline _BidirectionalIter2
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__copy_backward(_BidirectionalIter1 __first, _BidirectionalIter1 __last,
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_BidirectionalIter2 __result,
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bidirectional_iterator_tag)
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{
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while (__first != __last)
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*--__result = *--__last;
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return __result;
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}
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template<typename _RandomAccessIter, typename _BidirectionalIter>
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inline _BidirectionalIter
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__copy_backward(_RandomAccessIter __first, _RandomAccessIter __last,
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_BidirectionalIter __result,
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random_access_iterator_tag)
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{
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typename iterator_traits<_RandomAccessIter>::difference_type __n;
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for (__n = __last - __first; __n > 0; --__n)
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*--__result = *--__last;
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return __result;
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}
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// This dispatch class is a workaround for compilers that do not
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// have partial ordering of function templates. All we're doing is
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// creating a specialization so that we can turn a call to copy_backward
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// into a memmove whenever possible.
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template<typename _BidirectionalIter1, typename _BidirectionalIter2,
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typename _BoolType>
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struct __copy_backward_dispatch
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{
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static _BidirectionalIter2
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copy(_BidirectionalIter1 __first, _BidirectionalIter1 __last,
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_BidirectionalIter2 __result)
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{
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return __copy_backward(__first, __last,
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__result,
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__iterator_category(__first));
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}
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};
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template<typename _Tp>
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struct __copy_backward_dispatch<_Tp*, _Tp*, __true_type>
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{
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static _Tp*
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copy(const _Tp* __first, const _Tp* __last, _Tp* __result)
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{
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const ptrdiff_t _Num = __last - __first;
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memmove(__result - _Num, __first, sizeof(_Tp) * _Num);
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return __result - _Num;
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}
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};
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template<typename _Tp>
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struct __copy_backward_dispatch<const _Tp*, _Tp*, __true_type>
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{
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static _Tp*
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copy(const _Tp* __first, const _Tp* __last, _Tp* __result)
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{
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return __copy_backward_dispatch<_Tp*, _Tp*, __true_type>
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::copy(__first, __last, __result);
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}
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};
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template<typename _BI1, typename _BI2>
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inline _BI2
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__copy_backward_aux(_BI1 __first, _BI1 __last, _BI2 __result)
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{
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typedef typename __type_traits<typename iterator_traits<_BI2>::value_type>
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::has_trivial_assignment_operator _Trivial;
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return __copy_backward_dispatch<_BI1, _BI2, _Trivial>
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::copy(__first, __last, __result);
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}
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template <typename _BI1, typename _BI2>
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inline _BI2
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__copy_backward_output_normal_iterator(_BI1 __first, _BI1 __last,
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_BI2 __result, __true_type)
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{ return _BI2(__copy_backward_aux(__first, __last, __result.base())); }
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template <typename _BI1, typename _BI2>
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inline _BI2
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__copy_backward_output_normal_iterator(_BI1 __first, _BI1 __last,
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_BI2 __result, __false_type)
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{ return __copy_backward_aux(__first, __last, __result); }
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template <typename _BI1, typename _BI2>
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inline _BI2
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__copy_backward_input_normal_iterator(_BI1 __first, _BI1 __last,
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_BI2 __result, __true_type)
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{
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typedef typename _Is_normal_iterator<_BI2>::_Normal __Normal;
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return __copy_backward_output_normal_iterator(__first.base(), __last.base(),
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__result, __Normal());
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}
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template <typename _BI1, typename _BI2>
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inline _BI2
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__copy_backward_input_normal_iterator(_BI1 __first, _BI1 __last,
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_BI2 __result, __false_type)
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{
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typedef typename _Is_normal_iterator<_BI2>::_Normal __Normal;
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return __copy_backward_output_normal_iterator(__first, __last, __result,
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__Normal());
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}
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|
|
/**
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* @brief Copies the range [first,last) into result.
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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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|
* The function has the same effect as copy, but starts at the end of the
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* range and works its way to the start, returning the start of the result.
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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
|
|
* optimizations such as unrolling).
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*/
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template <typename _BI1, typename _BI2>
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inline _BI2
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copy_backward(_BI1 __first, _BI1 __last, _BI2 __result)
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{
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// concept requirements
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__glibcpp_function_requires(_BidirectionalIteratorConcept<_BI1>)
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|
__glibcpp_function_requires(_Mutable_BidirectionalIteratorConcept<_BI2>)
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|
__glibcpp_function_requires(_ConvertibleConcept<
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typename iterator_traits<_BI1>::value_type,
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typename iterator_traits<_BI2>::value_type>)
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typedef typename _Is_normal_iterator<_BI1>::_Normal __Normal;
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return __copy_backward_input_normal_iterator(__first, __last, __result,
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__Normal());
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}
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//--------------------------------------------------
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// fill and fill_n
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|
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|
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/**
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|
* @brief Fills the range [first,last) with copies of value.
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|
* @param first A forward iterator.
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|
* @param last A forward iterator.
|
|
* @param value A reference-to-const of arbitrary type.
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|
* @return Nothing.
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|
*
|
|
* This function fills a range with copies of the same value. For one-byte
|
|
* types filling contiguous areas of memory, this becomes an inline call to
|
|
* @c memset.
|
|
*/
|
|
template<typename _ForwardIter, typename _Tp>
|
|
void
|
|
fill(_ForwardIter __first, _ForwardIter __last, const _Tp& __value)
|
|
{
|
|
// concept requirements
|
|
__glibcpp_function_requires(_Mutable_ForwardIteratorConcept<_ForwardIter>)
|
|
|
|
for ( ; __first != __last; ++__first)
|
|
*__first = __value;
|
|
}
|
|
|
|
/**
|
|
* @brief Fills the range [first,first+n) with copies of value.
|
|
* @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 one-byte
|
|
* types filling contiguous areas of memory, this becomes an inline call to
|
|
* @c memset.
|
|
*/
|
|
template<typename _OutputIter, typename _Size, typename _Tp>
|
|
_OutputIter
|
|
fill_n(_OutputIter __first, _Size __n, const _Tp& __value)
|
|
{
|
|
// concept requirements
|
|
__glibcpp_function_requires(_OutputIteratorConcept<_OutputIter,_Tp>)
|
|
|
|
for ( ; __n > 0; --__n, ++__first)
|
|
*__first = __value;
|
|
return __first;
|
|
}
|
|
|
|
// Specialization: for one-byte types we can use memset.
|
|
|
|
inline void
|
|
fill(unsigned char* __first, unsigned char* __last, const unsigned char& __c)
|
|
{
|
|
unsigned char __tmp = __c;
|
|
memset(__first, __tmp, __last - __first);
|
|
}
|
|
|
|
inline void
|
|
fill(signed char* __first, signed char* __last, const signed char& __c)
|
|
{
|
|
signed char __tmp = __c;
|
|
memset(__first, static_cast<unsigned char>(__tmp), __last - __first);
|
|
}
|
|
|
|
inline void
|
|
fill(char* __first, char* __last, const char& __c)
|
|
{
|
|
char __tmp = __c;
|
|
memset(__first, static_cast<unsigned char>(__tmp), __last - __first);
|
|
}
|
|
|
|
template<typename _Size>
|
|
inline unsigned char*
|
|
fill_n(unsigned char* __first, _Size __n, const unsigned char& __c)
|
|
{
|
|
fill(__first, __first + __n, __c);
|
|
return __first + __n;
|
|
}
|
|
|
|
template<typename _Size>
|
|
inline signed char*
|
|
fill_n(char* __first, _Size __n, const signed char& __c)
|
|
{
|
|
fill(__first, __first + __n, __c);
|
|
return __first + __n;
|
|
}
|
|
|
|
template<typename _Size>
|
|
inline char*
|
|
fill_n(char* __first, _Size __n, const char& __c)
|
|
{
|
|
fill(__first, __first + __n, __c);
|
|
return __first + __n;
|
|
}
|
|
|
|
|
|
//--------------------------------------------------
|
|
// equal and mismatch
|
|
|
|
/**
|
|
* @brief Finds the places in ranges which don't match.
|
|
* @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 _InputIter1, typename _InputIter2>
|
|
pair<_InputIter1, _InputIter2>
|
|
mismatch(_InputIter1 __first1, _InputIter1 __last1,
|
|
_InputIter2 __first2)
|
|
{
|
|
// concept requirements
|
|
__glibcpp_function_requires(_InputIteratorConcept<_InputIter1>)
|
|
__glibcpp_function_requires(_InputIteratorConcept<_InputIter2>)
|
|
__glibcpp_function_requires(_EqualityComparableConcept<
|
|
typename iterator_traits<_InputIter1>::value_type>)
|
|
__glibcpp_function_requires(_EqualityComparableConcept<
|
|
typename iterator_traits<_InputIter2>::value_type>)
|
|
|
|
while (__first1 != __last1 && *__first1 == *__first2) {
|
|
++__first1;
|
|
++__first2;
|
|
}
|
|
return pair<_InputIter1, _InputIter2>(__first1, __first2);
|
|
}
|
|
|
|
/**
|
|
* @brief Finds the places in ranges which don't match.
|
|
* @param first1 An input iterator.
|
|
* @param last1 An input iterator.
|
|
* @param first2 An input iterator.
|
|
* @param binary_pred A binary predicate @link s20_3_1_base 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 _InputIter1, typename _InputIter2, typename _BinaryPredicate>
|
|
pair<_InputIter1, _InputIter2>
|
|
mismatch(_InputIter1 __first1, _InputIter1 __last1,
|
|
_InputIter2 __first2,
|
|
_BinaryPredicate __binary_pred)
|
|
{
|
|
// concept requirements
|
|
__glibcpp_function_requires(_InputIteratorConcept<_InputIter1>)
|
|
__glibcpp_function_requires(_InputIteratorConcept<_InputIter2>)
|
|
|
|
while (__first1 != __last1 && __binary_pred(*__first1, *__first2)) {
|
|
++__first1;
|
|
++__first2;
|
|
}
|
|
return pair<_InputIter1, _InputIter2>(__first1, __first2);
|
|
}
|
|
|
|
/**
|
|
* @brief Tests a range for element-wise equality.
|
|
* @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 _InputIter1, typename _InputIter2>
|
|
inline bool
|
|
equal(_InputIter1 __first1, _InputIter1 __last1,
|
|
_InputIter2 __first2)
|
|
{
|
|
// concept requirements
|
|
__glibcpp_function_requires(_InputIteratorConcept<_InputIter1>)
|
|
__glibcpp_function_requires(_InputIteratorConcept<_InputIter2>)
|
|
__glibcpp_function_requires(_EqualOpConcept<
|
|
typename iterator_traits<_InputIter1>::value_type,
|
|
typename iterator_traits<_InputIter2>::value_type>)
|
|
|
|
for ( ; __first1 != __last1; ++__first1, ++__first2)
|
|
if (!(*__first1 == *__first2))
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* @brief Tests a range for element-wise equality.
|
|
* @param first1 An input iterator.
|
|
* @param last1 An input iterator.
|
|
* @param first2 An input iterator.
|
|
* @param binary_pred A binary predicate @link s20_3_1_base 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 _InputIter1, typename _InputIter2, typename _BinaryPredicate>
|
|
inline bool
|
|
equal(_InputIter1 __first1, _InputIter1 __last1,
|
|
_InputIter2 __first2,
|
|
_BinaryPredicate __binary_pred)
|
|
{
|
|
// concept requirements
|
|
__glibcpp_function_requires(_InputIteratorConcept<_InputIter1>)
|
|
__glibcpp_function_requires(_InputIteratorConcept<_InputIter2>)
|
|
|
|
for ( ; __first1 != __last1; ++__first1, ++__first2)
|
|
if (!__binary_pred(*__first1, *__first2))
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
//--------------------------------------------------
|
|
// lexicographical_compare
|
|
|
|
/**
|
|
* @brief Performs "dictionary" comparison on ranges.
|
|
* @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 _InputIter1, typename _InputIter2>
|
|
bool
|
|
lexicographical_compare(_InputIter1 __first1, _InputIter1 __last1,
|
|
_InputIter2 __first2, _InputIter2 __last2)
|
|
{
|
|
// concept requirements
|
|
__glibcpp_function_requires(_InputIteratorConcept<_InputIter1>)
|
|
__glibcpp_function_requires(_InputIteratorConcept<_InputIter2>)
|
|
__glibcpp_function_requires(_LessThanComparableConcept<
|
|
typename iterator_traits<_InputIter1>::value_type>)
|
|
__glibcpp_function_requires(_LessThanComparableConcept<
|
|
typename iterator_traits<_InputIter2>::value_type>)
|
|
|
|
for ( ; __first1 != __last1 && __first2 != __last2
|
|
; ++__first1, ++__first2) {
|
|
if (*__first1 < *__first2)
|
|
return true;
|
|
if (*__first2 < *__first1)
|
|
return false;
|
|
}
|
|
return __first1 == __last1 && __first2 != __last2;
|
|
}
|
|
|
|
/**
|
|
* @brief Performs "dictionary" comparison on ranges.
|
|
* @param first1 An input iterator.
|
|
* @param last1 An input iterator.
|
|
* @param first2 An input iterator.
|
|
* @param last2 An input iterator.
|
|
* @param comp A @link s20_3_3_comparisons comparison functor@endlink.
|
|
* @return A boolean true or false.
|
|
*
|
|
* The same as the four-parameter @c lexigraphical_compare, but uses the
|
|
* comp parameter instead of @c <.
|
|
*/
|
|
template<typename _InputIter1, typename _InputIter2, typename _Compare>
|
|
bool
|
|
lexicographical_compare(_InputIter1 __first1, _InputIter1 __last1,
|
|
_InputIter2 __first2, _InputIter2 __last2,
|
|
_Compare __comp)
|
|
{
|
|
// concept requirements
|
|
__glibcpp_function_requires(_InputIteratorConcept<_InputIter1>)
|
|
__glibcpp_function_requires(_InputIteratorConcept<_InputIter2>)
|
|
|
|
for ( ; __first1 != __last1 && __first2 != __last2
|
|
; ++__first1, ++__first2) {
|
|
if (__comp(*__first1, *__first2))
|
|
return true;
|
|
if (__comp(*__first2, *__first1))
|
|
return false;
|
|
}
|
|
return __first1 == __last1 && __first2 != __last2;
|
|
}
|
|
|
|
inline bool
|
|
lexicographical_compare(const unsigned char* __first1, const unsigned char* __last1,
|
|
const unsigned char* __first2, const unsigned char* __last2)
|
|
{
|
|
const size_t __len1 = __last1 - __first1;
|
|
const size_t __len2 = __last2 - __first2;
|
|
const int __result = memcmp(__first1, __first2, std::min(__len1, __len2));
|
|
return __result != 0 ? __result < 0 : __len1 < __len2;
|
|
}
|
|
|
|
inline bool
|
|
lexicographical_compare(const char* __first1, const char* __last1,
|
|
const char* __first2, const char* __last2)
|
|
{
|
|
#if CHAR_MAX == SCHAR_MAX
|
|
return lexicographical_compare((const signed char*) __first1,
|
|
(const signed char*) __last1,
|
|
(const signed char*) __first2,
|
|
(const signed char*) __last2);
|
|
#else /* CHAR_MAX == SCHAR_MAX */
|
|
return lexicographical_compare((const unsigned char*) __first1,
|
|
(const unsigned char*) __last1,
|
|
(const unsigned char*) __first2,
|
|
(const unsigned char*) __last2);
|
|
#endif /* CHAR_MAX == SCHAR_MAX */
|
|
}
|
|
|
|
} // namespace std
|
|
|
|
#endif /* __GLIBCPP_INTERNAL_ALGOBASE_H */
|
|
|
|
// Local Variables:
|
|
// mode:C++
|
|
// End:
|