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Edit File : algorithm \| Size : 18.84 KB
// Algorithm extensions -- C++ -- // Copyright (C) 2001-2018 Free Software Foundation, Inc. // // This file is part of the GNU ISO C++ Library. This library is free // software; you can redistribute it and/or modify it under the // terms of the GNU General Public License as published by the // Free Software Foundation; either version 3, or (at your option) // any later version. // This library is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // Under Section 7 of GPL version 3, you are granted additional // permissions described in the GCC Runtime Library Exception, version // 3.1, as published by the Free Software Foundation. // You should have received a copy of the GNU General Public License and // a copy of the GCC Runtime Library Exception along with this program; // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see // <http://www.gnu.org/licenses/>. /* * * Copyright (c) 1994 * Hewlett-Packard Company * * Permission to use, copy, modify, distribute and sell this software * and its documentation for any purpose is hereby granted without fee, * provided that the above copyright notice appear in all copies and * that both that copyright notice and this permission notice appear * in supporting documentation. Hewlett-Packard Company makes no * representations about the suitability of this software for any * purpose. It is provided "as is" without express or implied warranty. * * * Copyright (c) 1996 * Silicon Graphics Computer Systems, Inc. * * Permission to use, copy, modify, distribute and sell this software * and its documentation for any purpose is hereby granted without fee, * provided that the above copyright notice appear in all copies and * that both that copyright notice and this permission notice appear * in supporting documentation. Silicon Graphics makes no * representations about the suitability of this software for any * purpose. It is provided "as is" without express or implied warranty. / /* @file ext/algorithm * This file is a GNU extension to the Standard C++ Library (possibly * containing extensions from the HP/SGI STL subset). / #ifndef _EXT_ALGORITHM #define _EXT_ALGORITHM 1 #pragma GCC system_header #include <algorithm> namespace __gnu_cxx _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION using std::ptrdiff_t; using std::min; using std::pair; using std::input_iterator_tag; using std::random_access_iterator_tag; using std::iterator_traits; //-------------------------------------------------- // copy_n (not part of the C++ standard) template<typename _InputIterator, typename _Size, typename _OutputIterator> pair<_InputIterator, _OutputIterator> __copy_n(_InputIterator __first, _Size __count, _OutputIterator __result, input_iterator_tag) { for ( ; __count > 0; --__count) { __result = __first; ++__first; ++__result; } return pair<_InputIterator, _OutputIterator>(__first, __result); } template<typename _RAIterator, typename _Size, typename _OutputIterator> inline pair<_RAIterator, _OutputIterator> __copy_n(_RAIterator __first, _Size __count, _OutputIterator __result, random_access_iterator_tag) { _RAIterator __last = __first + __count; return pair<_RAIterator, _OutputIterator>(__last, std::copy(__first, __last, __result)); } /* * @brief Copies the range [first,first+count) into [result,result+count). * @param __first An input iterator. * @param __count The number of elements to copy. * @param __result An output iterator. * @return A std::pair composed of first+count and result+count. * * This is an SGI extension. * 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). * @ingroup SGIextensions / template<typename _InputIterator, typename _Size, typename _OutputIterator> inline pair<_InputIterator, _OutputIterator> copy_n(_InputIterator __first, _Size __count, _OutputIterator __result) { // concept requirements __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, typename iterator_traits<_InputIterator>::value_type>) return __gnu_cxx::__copy_n(__first, __count, __result, std::__iterator_category(__first)); } template<typename _InputIterator1, typename _InputIterator2> int __lexicographical_compare_3way(_InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2, _InputIterator2 __last2) { while (__first1 != __last1 && __first2 != __last2) { if (__first1 < __first2) return -1; if (__first2 < __first1) return 1; ++__first1; ++__first2; } if (__first2 == __last2) return !(__first1 == __last1); else return -1; } inline int __lexicographical_compare_3way(const unsigned char __first1, const unsigned char* __last1, const unsigned char* __first2, const unsigned char* __last2) { const ptrdiff_t __len1 = __last1 - __first1; const ptrdiff_t __len2 = __last2 - __first2; const int __result = __builtin_memcmp(__first1, __first2, min(__len1, __len2)); return __result != 0 ? __result : (__len1 == __len2 ? 0 : (__len1 < __len2 ? -1 : 1)); } inline int __lexicographical_compare_3way(const char* __first1, const char* __last1, const char* __first2, const char* __last2) { #if CHAR_MAX == SCHAR_MAX return __lexicographical_compare_3way((const signed char) __first1, (const signed char) __last1, (const signed char) __first2, (const signed char) __last2); #else return __lexicographical_compare_3way((const unsigned char) __first1, (const unsigned char) __last1, (const unsigned char) __first2, (const unsigned char) __last2); #endif } /** * @brief @c memcmp on steroids. * @param __first1 An input iterator. * @param __last1 An input iterator. * @param __first2 An input iterator. * @param __last2 An input iterator. * @return An int, as with @c memcmp. * * The return value will be less than zero if the first range is * <em>lexigraphically less than</em> the second, greater than zero * if the second range is <em>lexigraphically less than</em> the * first, and zero otherwise. * This is an SGI extension. * @ingroup SGIextensions / template<typename _InputIterator1, typename _InputIterator2> int lexicographical_compare_3way(_InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2, _InputIterator2 __last2) { // concept requirements __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>) __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>) __glibcxx_function_requires(_LessThanComparableConcept< typename iterator_traits<_InputIterator1>::value_type>) __glibcxx_function_requires(_LessThanComparableConcept< typename iterator_traits<_InputIterator2>::value_type>) __glibcxx_requires_valid_range(__first1, __last1); __glibcxx_requires_valid_range(__first2, __last2); return __lexicographical_compare_3way(__first1, __last1, __first2, __last2); } // count and count_if: this version, whose return type is void, was present // in the HP STL, and is retained as an extension for backward compatibility. template<typename _InputIterator, typename _Tp, typename _Size> void count(_InputIterator __first, _InputIterator __last, const _Tp& __value, _Size& __n) { // concept requirements __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) __glibcxx_function_requires(_EqualityComparableConcept< typename iterator_traits<_InputIterator>::value_type >) __glibcxx_function_requires(_EqualityComparableConcept<_Tp>) __glibcxx_requires_valid_range(__first, __last); for ( ; __first != __last; ++__first) if (__first == __value) ++__n; } template<typename _InputIterator, typename _Predicate, typename _Size> void count_if(_InputIterator __first, _InputIterator __last, _Predicate __pred, _Size& __n) { // concept requirements __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) __glibcxx_function_requires(_UnaryPredicateConcept<_Predicate, typename iterator_traits<_InputIterator>::value_type>) __glibcxx_requires_valid_range(__first, __last); for ( ; __first != __last; ++__first) if (__pred(__first)) ++__n; } // random_sample and random_sample_n (extensions, not part of the standard). /* * This is an SGI extension. * @ingroup SGIextensions * @doctodo / template<typename _ForwardIterator, typename _OutputIterator, typename _Distance> _OutputIterator random_sample_n(_ForwardIterator __first, _ForwardIterator __last, _OutputIterator __out, const _Distance __n) { // concept requirements __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, typename iterator_traits<_ForwardIterator>::value_type>) __glibcxx_requires_valid_range(__first, __last); _Distance __remaining = std::distance(__first, __last); _Distance __m = min(__n, __remaining); while (__m > 0) { if ((std::rand() % __remaining) < __m) { __out = __first; ++__out; --__m; } --__remaining; ++__first; } return __out; } /* * This is an SGI extension. * @ingroup SGIextensions * @doctodo / template<typename _ForwardIterator, typename _OutputIterator, typename _Distance, typename _RandomNumberGenerator> _OutputIterator random_sample_n(_ForwardIterator __first, _ForwardIterator __last, _OutputIterator __out, const _Distance __n, _RandomNumberGenerator& __rand) { // concept requirements __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator, typename iterator_traits<_ForwardIterator>::value_type>) __glibcxx_function_requires(_UnaryFunctionConcept< _RandomNumberGenerator, _Distance, _Distance>) __glibcxx_requires_valid_range(__first, __last); _Distance __remaining = std::distance(__first, __last); _Distance __m = min(__n, __remaining); while (__m > 0) { if (__rand(__remaining) < __m) { __out = __first; ++__out; --__m; } --__remaining; ++__first; } return __out; } template<typename _InputIterator, typename _RandomAccessIterator, typename _Distance> _RandomAccessIterator __random_sample(_InputIterator __first, _InputIterator __last, _RandomAccessIterator __out, const _Distance __n) { _Distance __m = 0; _Distance __t = __n; for ( ; __first != __last && __m < __n; ++__m, ++__first) __out[__m] = __first; while (__first != __last) { ++__t; _Distance __M = std::rand() % (__t); if (__M < __n) __out[__M] = __first; ++__first; } return __out + __m; } template<typename _InputIterator, typename _RandomAccessIterator, typename _RandomNumberGenerator, typename _Distance> _RandomAccessIterator __random_sample(_InputIterator __first, _InputIterator __last, _RandomAccessIterator __out, _RandomNumberGenerator& __rand, const _Distance __n) { // concept requirements __glibcxx_function_requires(_UnaryFunctionConcept< _RandomNumberGenerator, _Distance, _Distance>) _Distance __m = 0; _Distance __t = __n; for ( ; __first != __last && __m < __n; ++__m, ++__first) __out[__m] = __first; while (__first != __last) { ++__t; _Distance __M = __rand(__t); if (__M < __n) __out[__M] = __first; ++__first; } return __out + __m; } /* * This is an SGI extension. * @ingroup SGIextensions * @doctodo / template<typename _InputIterator, typename _RandomAccessIterator> inline _RandomAccessIterator random_sample(_InputIterator __first, _InputIterator __last, _RandomAccessIterator __out_first, _RandomAccessIterator __out_last) { // concept requirements __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept< _RandomAccessIterator>) __glibcxx_requires_valid_range(__first, __last); __glibcxx_requires_valid_range(__out_first, __out_last); return __random_sample(__first, __last, __out_first, __out_last - __out_first); } /* * This is an SGI extension. * @ingroup SGIextensions * @doctodo / template<typename _InputIterator, typename _RandomAccessIterator, typename _RandomNumberGenerator> inline _RandomAccessIterator random_sample(_InputIterator __first, _InputIterator __last, _RandomAccessIterator __out_first, _RandomAccessIterator __out_last, _RandomNumberGenerator& __rand) { // concept requirements __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>) __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept< _RandomAccessIterator>) __glibcxx_requires_valid_range(__first, __last); __glibcxx_requires_valid_range(__out_first, __out_last); return __random_sample(__first, __last, __out_first, __rand, __out_last - __out_first); } #if __cplusplus >= 201103L using std::is_heap; #else /* * This is an SGI extension. * @ingroup SGIextensions * @doctodo / template<typename _RandomAccessIterator> inline bool is_heap(_RandomAccessIterator __first, _RandomAccessIterator __last) { // concept requirements __glibcxx_function_requires(_RandomAccessIteratorConcept< _RandomAccessIterator>) __glibcxx_function_requires(_LessThanComparableConcept< typename iterator_traits<_RandomAccessIterator>::value_type>) __glibcxx_requires_valid_range(__first, __last); return std::__is_heap(__first, __last - __first); } /* * This is an SGI extension. * @ingroup SGIextensions * @doctodo / template<typename _RandomAccessIterator, typename _StrictWeakOrdering> inline bool is_heap(_RandomAccessIterator __first, _RandomAccessIterator __last, _StrictWeakOrdering __comp) { // concept requirements __glibcxx_function_requires(_RandomAccessIteratorConcept< _RandomAccessIterator>) __glibcxx_function_requires(_BinaryPredicateConcept<_StrictWeakOrdering, typename iterator_traits<_RandomAccessIterator>::value_type, typename iterator_traits<_RandomAccessIterator>::value_type>) __glibcxx_requires_valid_range(__first, __last); return std::__is_heap(__first, __comp, __last - __first); } #endif #if __cplusplus >= 201103L using std::is_sorted; #else // is_sorted, a predicated testing whether a range is sorted in // nondescending order. This is an extension, not part of the C++ // standard. /* * This is an SGI extension. * @ingroup SGIextensions * @doctodo / template<typename _ForwardIterator> bool is_sorted(_ForwardIterator __first, _ForwardIterator __last) { // concept requirements __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) __glibcxx_function_requires(_LessThanComparableConcept< typename iterator_traits<_ForwardIterator>::value_type>) __glibcxx_requires_valid_range(__first, __last); if (__first == __last) return true; _ForwardIterator __next = __first; for (++__next; __next != __last; __first = __next, ++__next) if (__next < __first) return false; return true; } /* * This is an SGI extension. * @ingroup SGIextensions * @doctodo / template<typename _ForwardIterator, typename _StrictWeakOrdering> bool is_sorted(_ForwardIterator __first, _ForwardIterator __last, _StrictWeakOrdering __comp) { // concept requirements __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>) __glibcxx_function_requires(_BinaryPredicateConcept<_StrictWeakOrdering, typename iterator_traits<_ForwardIterator>::value_type, typename iterator_traits<_ForwardIterator>::value_type>) __glibcxx_requires_valid_range(__first, __last); if (__first == __last) return true; _ForwardIterator __next = __first; for (++__next; __next != __last; __first = __next, ++__next) if (__comp(__next, __first)) return false; return true; } #endif // C++11 /* * @brief Find the median of three values. * @param __a A value. * @param __b A value. * @param __c A value. * @return One of @p a, @p b or @p c. * * If @c {l,m,n} is some convolution of @p {a,b,c} such that @c l<=m<=n * then the value returned will be @c m. * This is an SGI extension. * @ingroup SGIextensions / template<typename _Tp> const _Tp& __median(const _Tp& __a, const _Tp& __b, const _Tp& __c) { // concept requirements __glibcxx_function_requires(_LessThanComparableConcept<_Tp>) if (__a < __b) if (__b < __c) return __b; else if (__a < __c) return __c; else return __a; else if (__a < __c) return __a; else if (__b < __c) return __c; else return __b; } /* * @brief Find the median of three values using a predicate for comparison. * @param __a A value. * @param __b A value. * @param __c A value. * @param __comp A binary predicate. * @return One of @p a, @p b or @p c. * * If @c {l,m,n} is some convolution of @p {a,b,c} such that @p comp(l,m) * and @p comp(m,n) are both true then the value returned will be @c m. * This is an SGI extension. * @ingroup SGIextensions / template<typename _Tp, typename _Compare> const _Tp& __median(const _Tp& __a, const _Tp& __b, const _Tp& __c, _Compare __comp) { // concept requirements __glibcxx_function_requires(_BinaryFunctionConcept<_Compare, bool, _Tp, _Tp>) if (__comp(__a, __b)) if (__comp(__b, __c)) return __b; else if (__comp(__a, __c)) return __c; else return __a; else if (__comp(__a, __c)) return __a; else if (__comp(__b, __c)) return __c; else return __b; } _GLIBCXX_END_NAMESPACE_VERSION } // namespace #endif / _EXT_ALGORITHM */ Back

Edit File : algorithm | Size : 18.84 KB

// Algorithm extensions -*- C++ -*-

// Copyright (C) 2001-2018 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
// <http://www.gnu.org/licenses/>.

/*
 *
 * Copyright (c) 1994
 * Hewlett-Packard Company
 *
 * Permission to use, copy, modify, distribute and sell this software
 * and its documentation for any purpose is hereby granted without fee,
 * provided that the above copyright notice appear in all copies and
 * that both that copyright notice and this permission notice appear
 * in supporting documentation.  Hewlett-Packard Company makes no
 * representations about the suitability of this software for any
 * purpose.  It is provided "as is" without express or implied warranty.
 *
 *
 * Copyright (c) 1996
 * Silicon Graphics Computer Systems, Inc.
 *
 * Permission to use, copy, modify, distribute and sell this software
 * and its documentation for any purpose is hereby granted without fee,
 * provided that the above copyright notice appear in all copies and
 * that both that copyright notice and this permission notice appear
 * in supporting documentation.  Silicon Graphics makes no
 * representations about the suitability of this software for any
 * purpose.  It is provided "as is" without express or implied warranty.
 */

/** @file ext/algorithm
 *  This file is a GNU extension to the Standard C++ Library (possibly
 *  containing extensions from the HP/SGI STL subset).
 */

#ifndef _EXT_ALGORITHM
#define _EXT_ALGORITHM 1

#pragma GCC system_header

#include <algorithm>

namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

using std::ptrdiff_t;
  using std::min;
  using std::pair;
  using std::input_iterator_tag;
  using std::random_access_iterator_tag;
  using std::iterator_traits;

//--------------------------------------------------
  // copy_n (not part of the C++ standard)

template<typename _InputIterator, typename _Size, typename _OutputIterator>
    pair<_InputIterator, _OutputIterator>
    __copy_n(_InputIterator __first, _Size __count,
	     _OutputIterator __result,
	     input_iterator_tag)
    {
      for ( ; __count > 0; --__count)
	{
	  *__result = *__first;
	  ++__first;
	  ++__result;
	}
      return pair<_InputIterator, _OutputIterator>(__first, __result);
    }

template<typename _RAIterator, typename _Size, typename _OutputIterator>
    inline pair<_RAIterator, _OutputIterator>
    __copy_n(_RAIterator __first, _Size __count,
	     _OutputIterator __result,
	     random_access_iterator_tag)
    {
      _RAIterator __last = __first + __count;
      return pair<_RAIterator, _OutputIterator>(__last, std::copy(__first,
								  __last,
								  __result));
    }

/**
   *  @brief Copies the range [first,first+count) into [result,result+count).
   *  @param  __first  An input iterator.
   *  @param  __count  The number of elements to copy.
   *  @param  __result An output iterator.
   *  @return   A std::pair composed of first+count and result+count.
   *
   *  This is an SGI extension.
   *  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).
   *  @ingroup SGIextensions
  */
  template<typename _InputIterator, typename _Size, typename _OutputIterator>
    inline pair<_InputIterator, _OutputIterator>
    copy_n(_InputIterator __first, _Size __count, _OutputIterator __result)
    {
      // concept requirements
      __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
      __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
	    typename iterator_traits<_InputIterator>::value_type>)

return __gnu_cxx::__copy_n(__first, __count, __result,
				 std::__iterator_category(__first));
    }

template<typename _InputIterator1, typename _InputIterator2>
    int
    __lexicographical_compare_3way(_InputIterator1 __first1,
				   _InputIterator1 __last1,
				   _InputIterator2 __first2,
				   _InputIterator2 __last2)
    {
      while (__first1 != __last1 && __first2 != __last2)
	{
	  if (*__first1 < *__first2)
	    return -1;
	  if (*__first2 < *__first1)
	    return 1;
	  ++__first1;
	  ++__first2;
	}
      if (__first2 == __last2)
	return !(__first1 == __last1);
      else
	return -1;
    }

inline int
  __lexicographical_compare_3way(const unsigned char* __first1,
				 const unsigned char* __last1,
				 const unsigned char* __first2,
				 const unsigned char* __last2)
  {
    const ptrdiff_t __len1 = __last1 - __first1;
    const ptrdiff_t __len2 = __last2 - __first2;
    const int __result = __builtin_memcmp(__first1, __first2,
					  min(__len1, __len2));
    return __result != 0 ? __result
			 : (__len1 == __len2 ? 0 : (__len1 < __len2 ? -1 : 1));
  }

inline int
  __lexicographical_compare_3way(const char* __first1, const char* __last1,
				 const char* __first2, const char* __last2)
  {
#if CHAR_MAX == SCHAR_MAX
    return __lexicographical_compare_3way((const signed char*) __first1,
					  (const signed char*) __last1,
					  (const signed char*) __first2,
					  (const signed char*) __last2);
#else
    return __lexicographical_compare_3way((const unsigned char*) __first1,
					  (const unsigned char*) __last1,
					  (const unsigned char*) __first2,
					  (const unsigned char*) __last2);
#endif
  }

/**
   *  @brief @c memcmp on steroids.
   *  @param  __first1  An input iterator.
   *  @param  __last1   An input iterator.
   *  @param  __first2  An input iterator.
   *  @param  __last2   An input iterator.
   *  @return   An int, as with @c memcmp.
   *
   *  The return value will be less than zero if the first range is
   *  <em>lexigraphically less than</em> the second, greater than zero
   *  if the second range is <em>lexigraphically less than</em> the
   *  first, and zero otherwise.
   *  This is an SGI extension.
   *  @ingroup SGIextensions
  */
  template<typename _InputIterator1, typename _InputIterator2>
    int
    lexicographical_compare_3way(_InputIterator1 __first1,
				 _InputIterator1 __last1,
				 _InputIterator2 __first2,
				 _InputIterator2 __last2)
    {
      // concept requirements
      __glibcxx_function_requires(_InputIteratorConcept<_InputIterator1>)
      __glibcxx_function_requires(_InputIteratorConcept<_InputIterator2>)
      __glibcxx_function_requires(_LessThanComparableConcept<
	    typename iterator_traits<_InputIterator1>::value_type>)
      __glibcxx_function_requires(_LessThanComparableConcept<
	    typename iterator_traits<_InputIterator2>::value_type>)
      __glibcxx_requires_valid_range(__first1, __last1);
      __glibcxx_requires_valid_range(__first2, __last2);

return __lexicographical_compare_3way(__first1, __last1, __first2,
					    __last2);
    }

// count and count_if: this version, whose return type is void, was present
  // in the HP STL, and is retained as an extension for backward compatibility.
  template<typename _InputIterator, typename _Tp, typename _Size>
    void
    count(_InputIterator __first, _InputIterator __last,
	  const _Tp& __value,
	  _Size& __n)
    {
      // concept requirements
      __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
      __glibcxx_function_requires(_EqualityComparableConcept<
	    typename iterator_traits<_InputIterator>::value_type >)
      __glibcxx_function_requires(_EqualityComparableConcept<_Tp>)
      __glibcxx_requires_valid_range(__first, __last);

for ( ; __first != __last; ++__first)
	if (*__first == __value)
	  ++__n;
    }

template<typename _InputIterator, typename _Predicate, typename _Size>
    void
    count_if(_InputIterator __first, _InputIterator __last,
	     _Predicate __pred,
	     _Size& __n)
    {
      // concept requirements
      __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
      __glibcxx_function_requires(_UnaryPredicateConcept<_Predicate,
	    typename iterator_traits<_InputIterator>::value_type>)
      __glibcxx_requires_valid_range(__first, __last);

for ( ; __first != __last; ++__first)
	if (__pred(*__first))
	  ++__n;
    }

// random_sample and random_sample_n (extensions, not part of the standard).

/**
   *  This is an SGI extension.
   *  @ingroup SGIextensions
   *  @doctodo
  */
  template<typename _ForwardIterator, typename _OutputIterator,
	   typename _Distance>
    _OutputIterator
    random_sample_n(_ForwardIterator __first, _ForwardIterator __last,
                    _OutputIterator __out, const _Distance __n)
    {
      // concept requirements
      __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
      __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
		typename iterator_traits<_ForwardIterator>::value_type>)
      __glibcxx_requires_valid_range(__first, __last);

_Distance __remaining = std::distance(__first, __last);
      _Distance __m = min(__n, __remaining);

while (__m > 0)
	{
	  if ((std::rand() % __remaining) < __m)
	    {
	      *__out = *__first;
	      ++__out;
	      --__m;
	    }
	  --__remaining;
	  ++__first;
	}
      return __out;
    }

/**
   *  This is an SGI extension.
   *  @ingroup SGIextensions
   *  @doctodo
  */
  template<typename _ForwardIterator, typename _OutputIterator,
	   typename _Distance, typename _RandomNumberGenerator>
    _OutputIterator
    random_sample_n(_ForwardIterator __first, _ForwardIterator __last,
                   _OutputIterator __out, const _Distance __n,
		   _RandomNumberGenerator& __rand)
    {
      // concept requirements
      __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
      __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
		typename iterator_traits<_ForwardIterator>::value_type>)
      __glibcxx_function_requires(_UnaryFunctionConcept<
		_RandomNumberGenerator, _Distance, _Distance>)
      __glibcxx_requires_valid_range(__first, __last);

_Distance __remaining = std::distance(__first, __last);
      _Distance __m = min(__n, __remaining);

while (__m > 0)
	{
	  if (__rand(__remaining) < __m)
	    {
	      *__out = *__first;
	      ++__out;
	      --__m;
	    }
	  --__remaining;
	  ++__first;
	}
      return __out;
    }

template<typename _InputIterator, typename _RandomAccessIterator,
	   typename _Distance>
    _RandomAccessIterator
    __random_sample(_InputIterator __first, _InputIterator __last,
		    _RandomAccessIterator __out,
		    const _Distance __n)
    {
      _Distance __m = 0;
      _Distance __t = __n;
      for ( ; __first != __last && __m < __n; ++__m, ++__first)
	__out[__m] = *__first;

while (__first != __last)
	{
	  ++__t;
	  _Distance __M = std::rand() % (__t);
	  if (__M < __n)
	    __out[__M] = *__first;
	  ++__first;
	}
      return __out + __m;
    }

template<typename _InputIterator, typename _RandomAccessIterator,
	   typename _RandomNumberGenerator, typename _Distance>
    _RandomAccessIterator
    __random_sample(_InputIterator __first, _InputIterator __last,
		    _RandomAccessIterator __out,
		    _RandomNumberGenerator& __rand,
		    const _Distance __n)
    {
      // concept requirements
      __glibcxx_function_requires(_UnaryFunctionConcept<
	    _RandomNumberGenerator, _Distance, _Distance>)

_Distance __m = 0;
      _Distance __t = __n;
      for ( ; __first != __last && __m < __n; ++__m, ++__first)
	__out[__m] = *__first;

while (__first != __last)
	{
	  ++__t;
	  _Distance __M = __rand(__t);
	  if (__M < __n)
	    __out[__M] = *__first;
	  ++__first;
	}
      return __out + __m;
    }

/**
   *  This is an SGI extension.
   *  @ingroup SGIextensions
   *  @doctodo
  */
  template<typename _InputIterator, typename _RandomAccessIterator>
    inline _RandomAccessIterator
    random_sample(_InputIterator __first, _InputIterator __last,
		  _RandomAccessIterator __out_first,
		  _RandomAccessIterator __out_last)
    {
      // concept requirements
      __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
      __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
	    _RandomAccessIterator>)
      __glibcxx_requires_valid_range(__first, __last);
      __glibcxx_requires_valid_range(__out_first, __out_last);

return __random_sample(__first, __last,
			     __out_first, __out_last - __out_first);
    }

/**
   *  This is an SGI extension.
   *  @ingroup SGIextensions
   *  @doctodo
  */
  template<typename _InputIterator, typename _RandomAccessIterator,
	   typename _RandomNumberGenerator>
    inline _RandomAccessIterator
    random_sample(_InputIterator __first, _InputIterator __last,
		  _RandomAccessIterator __out_first,
		  _RandomAccessIterator __out_last,
		  _RandomNumberGenerator& __rand)
    {
      // concept requirements
      __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
      __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<
	    _RandomAccessIterator>)
      __glibcxx_requires_valid_range(__first, __last);
      __glibcxx_requires_valid_range(__out_first, __out_last);

return __random_sample(__first, __last,
			     __out_first, __rand,
			     __out_last - __out_first);
    }

#if __cplusplus >= 201103L
  using std::is_heap;
#else
  /**
   *  This is an SGI extension.
   *  @ingroup SGIextensions
   *  @doctodo
  */
  template<typename _RandomAccessIterator>
    inline bool
    is_heap(_RandomAccessIterator __first, _RandomAccessIterator __last)
    {
      // concept requirements
      __glibcxx_function_requires(_RandomAccessIteratorConcept<
				  _RandomAccessIterator>)
      __glibcxx_function_requires(_LessThanComparableConcept<
	    typename iterator_traits<_RandomAccessIterator>::value_type>)
      __glibcxx_requires_valid_range(__first, __last);

return std::__is_heap(__first, __last - __first);
    }

/**
   *  This is an SGI extension.
   *  @ingroup SGIextensions
   *  @doctodo
  */
  template<typename _RandomAccessIterator, typename _StrictWeakOrdering>
    inline bool
    is_heap(_RandomAccessIterator __first, _RandomAccessIterator __last,
	    _StrictWeakOrdering __comp)
    {
      // concept requirements
      __glibcxx_function_requires(_RandomAccessIteratorConcept<
				  _RandomAccessIterator>)
      __glibcxx_function_requires(_BinaryPredicateConcept<_StrictWeakOrdering,
	    typename iterator_traits<_RandomAccessIterator>::value_type,
	    typename iterator_traits<_RandomAccessIterator>::value_type>)
      __glibcxx_requires_valid_range(__first, __last);

return std::__is_heap(__first, __comp, __last - __first);
    }
#endif

#if __cplusplus >= 201103L
  using std::is_sorted;
#else
  // is_sorted, a predicated testing whether a range is sorted in
  // nondescending order.  This is an extension, not part of the C++
  // standard.

/**
   *  This is an SGI extension.
   *  @ingroup SGIextensions
   *  @doctodo
  */
  template<typename _ForwardIterator>
    bool
    is_sorted(_ForwardIterator __first, _ForwardIterator __last)
    {
      // concept requirements
      __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
      __glibcxx_function_requires(_LessThanComparableConcept<
	    typename iterator_traits<_ForwardIterator>::value_type>)
      __glibcxx_requires_valid_range(__first, __last);

if (__first == __last)
	return true;

_ForwardIterator __next = __first;
      for (++__next; __next != __last; __first = __next, ++__next)
	if (*__next < *__first)
	  return false;
      return true;
    }

/**
   *  This is an SGI extension.
   *  @ingroup SGIextensions
   *  @doctodo
  */
  template<typename _ForwardIterator, typename _StrictWeakOrdering>
    bool
    is_sorted(_ForwardIterator __first, _ForwardIterator __last,
	      _StrictWeakOrdering __comp)
    {
      // concept requirements
      __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator>)
      __glibcxx_function_requires(_BinaryPredicateConcept<_StrictWeakOrdering,
	    typename iterator_traits<_ForwardIterator>::value_type,
	    typename iterator_traits<_ForwardIterator>::value_type>)
      __glibcxx_requires_valid_range(__first, __last);

if (__first == __last)
	return true;

_ForwardIterator __next = __first;
      for (++__next; __next != __last; __first = __next, ++__next)
	if (__comp(*__next, *__first))
	  return false;
      return true;
    }
#endif  // C++11

/**
   *  @brief Find the median of three values.
   *  @param  __a  A value.
   *  @param  __b  A value.
   *  @param  __c  A value.
   *  @return One of @p a, @p b or @p c.
   *
   *  If @c {l,m,n} is some convolution of @p {a,b,c} such that @c l<=m<=n
   *  then the value returned will be @c m.
   *  This is an SGI extension.
   *  @ingroup SGIextensions
  */
  template<typename _Tp>
    const _Tp&
    __median(const _Tp& __a, const _Tp& __b, const _Tp& __c)
    {
      // concept requirements
      __glibcxx_function_requires(_LessThanComparableConcept<_Tp>)
      if (__a < __b)
	if (__b < __c)
	  return __b;
	else if (__a < __c)
	  return __c;
	else
	  return __a;
      else if (__a < __c)
	return __a;
      else if (__b < __c)
	return __c;
      else
	return __b;
    }

/**
   *  @brief Find the median of three values using a predicate for comparison.
   *  @param  __a     A value.
   *  @param  __b     A value.
   *  @param  __c     A value.
   *  @param  __comp  A binary predicate.
   *  @return One of @p a, @p b or @p c.
   *
   *  If @c {l,m,n} is some convolution of @p {a,b,c} such that @p comp(l,m)
   *  and @p comp(m,n) are both true then the value returned will be @c m.
   *  This is an SGI extension.
   *  @ingroup SGIextensions
  */
  template<typename _Tp, typename _Compare>
    const _Tp&
    __median(const _Tp& __a, const _Tp& __b, const _Tp& __c, _Compare __comp)
    {
      // concept requirements
      __glibcxx_function_requires(_BinaryFunctionConcept<_Compare, bool,
				                         _Tp, _Tp>)
      if (__comp(__a, __b))
	if (__comp(__b, __c))
	  return __b;
	else if (__comp(__a, __c))
	  return __c;
	else
	  return __a;
      else if (__comp(__a, __c))
	return __a;
      else if (__comp(__b, __c))
	return __c;
      else
	return __b;
    }

_GLIBCXX_END_NAMESPACE_VERSION
} // namespace

#endif /* _EXT_ALGORITHM */

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