// Algorithm implementation -*- C++ -*-
-// Copyright (C) 2001-2019 Free Software Foundation, Inc.
+// Copyright (C) 2001-2023 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
#ifndef _STL_ALGO_H
#define _STL_ALGO_H 1
-#include <cstdlib> // for rand
#include <bits/algorithmfwd.h>
+#include <bits/stl_algobase.h>
#include <bits/stl_heap.h>
-#include <bits/stl_tempbuf.h> // for _Temporary_buffer
#include <bits/predefined_ops.h>
#if __cplusplus >= 201103L
#include <bits/uniform_int_dist.h>
#endif
+#if _GLIBCXX_HOSTED
+# include <bits/stl_tempbuf.h> // for _Temporary_buffer
+# if (__cplusplus <= 201103L || _GLIBCXX_USE_DEPRECATED)
+# include <cstdlib> // for rand
+# endif
+#endif
+
// See concept_check.h for the __glibcxx_*_requires macros.
namespace std _GLIBCXX_VISIBILITY(default)
std::iter_swap(__result, __b);
}
- /// This is an overload used by find algos for the Input Iterator case.
- template<typename _InputIterator, typename _Predicate>
- _GLIBCXX20_CONSTEXPR
- inline _InputIterator
- __find_if(_InputIterator __first, _InputIterator __last,
- _Predicate __pred, input_iterator_tag)
- {
- while (__first != __last && !__pred(__first))
- ++__first;
- return __first;
- }
-
- /// This is an overload used by find algos for the RAI case.
- template<typename _RandomAccessIterator, typename _Predicate>
- _GLIBCXX20_CONSTEXPR
- _RandomAccessIterator
- __find_if(_RandomAccessIterator __first, _RandomAccessIterator __last,
- _Predicate __pred, random_access_iterator_tag)
- {
- typename iterator_traits<_RandomAccessIterator>::difference_type
- __trip_count = (__last - __first) >> 2;
-
- for (; __trip_count > 0; --__trip_count)
- {
- if (__pred(__first))
- return __first;
- ++__first;
-
- if (__pred(__first))
- return __first;
- ++__first;
-
- if (__pred(__first))
- return __first;
- ++__first;
-
- if (__pred(__first))
- return __first;
- ++__first;
- }
-
- switch (__last - __first)
- {
- case 3:
- if (__pred(__first))
- return __first;
- ++__first;
- case 2:
- if (__pred(__first))
- return __first;
- ++__first;
- case 1:
- if (__pred(__first))
- return __first;
- ++__first;
- case 0:
- default:
- return __last;
- }
- }
-
- template<typename _Iterator, typename _Predicate>
- _GLIBCXX20_CONSTEXPR
- inline _Iterator
- __find_if(_Iterator __first, _Iterator __last, _Predicate __pred)
- {
- return __find_if(__first, __last, __pred,
- std::__iterator_category(__first));
- }
-
/// Provided for stable_partition to use.
template<typename _InputIterator, typename _Predicate>
_GLIBCXX20_CONSTEXPR
{ return __last == _GLIBCXX_STD_A::find_if(__first, __last, __pred); }
/**
- * @brief Checks that a predicate is false for at least an element
+ * @brief Checks that a predicate is true for at least one element
* of a sequence.
* @ingroup non_mutating_algorithms
* @param __first An input iterator.
return __result;
}
- template<typename _InputIterator, typename _Size, typename _OutputIterator>
- _GLIBCXX20_CONSTEXPR
- _OutputIterator
- __copy_n_a(_InputIterator __first, _Size __n, _OutputIterator __result)
- {
- if (__n > 0)
- {
- while (true)
- {
- *__result = *__first;
- ++__result;
- if (--__n > 0)
- ++__first;
- else
- break;
- }
- }
- return __result;
- }
-
- template<typename _CharT, typename _Size>
- __enable_if_t<__is_char<_CharT>::__value, _CharT*>
- __copy_n_a(istreambuf_iterator<_CharT, char_traits<_CharT>>,
- _Size, _CharT*);
-
template<typename _InputIterator, typename _Size, typename _OutputIterator>
_GLIBCXX20_CONSTEXPR
_OutputIterator
{
return std::__niter_wrap(__result,
__copy_n_a(__first, __n,
- std::__niter_base(__result)));
+ std::__niter_base(__result), true));
}
template<typename _RandomAccessIterator, typename _Size,
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
__glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
typename iterator_traits<_InputIterator>::value_type>)
- __glibcxx_requires_can_increment(__first, __n);
- __glibcxx_requires_can_increment(__result, __n);
- return std::__copy_n(__first, __n, __result,
+ const auto __n2 = std::__size_to_integer(__n);
+ if (__n2 <= 0)
+ return __result;
+
+ __glibcxx_requires_can_increment(__first, __n2);
+ __glibcxx_requires_can_increment(__result, __n2);
+
+ return std::__copy_n(__first, __n2, __result,
std::__iterator_category(__first));
}
}
#endif // C++11
- template<typename _ForwardIterator, typename _Predicate>
- _GLIBCXX20_CONSTEXPR
- _ForwardIterator
- __remove_if(_ForwardIterator __first, _ForwardIterator __last,
- _Predicate __pred)
- {
- __first = std::__find_if(__first, __last, __pred);
- if (__first == __last)
- return __first;
- _ForwardIterator __result = __first;
- ++__first;
- for (; __first != __last; ++__first)
- if (!__pred(__first))
- {
- *__result = _GLIBCXX_MOVE(*__first);
- ++__result;
- }
- return __result;
- }
-
/**
* @brief Remove elements from a sequence.
* @ingroup mutating_algorithms
return __m;
}
- inline namespace _V2
- {
+_GLIBCXX_BEGIN_INLINE_ABI_NAMESPACE(_V2)
/// This is a helper function for the rotate algorithm.
template<typename _ForwardIterator>
std::__iterator_category(__first));
}
- } // namespace _V2
+_GLIBCXX_END_INLINE_ABI_NAMESPACE(_V2)
/**
* @brief Copy a sequence, rotating its elements.
}
}
+#if _GLIBCXX_HOSTED
// partition
/// This is a helper function...
return std::__stable_partition(__first, __last,
__gnu_cxx::__ops::__pred_iter(__pred));
}
+#endif // HOSTED
+
+ /// @cond undocumented
/// This is a helper function for the sort routines.
template<typename _RandomAccessIterator, typename _Compare>
return __result_real_last;
}
+ /// @endcond
+
/**
* @brief Copy the smallest elements of a sequence.
* @ingroup sorting_algorithms
* @param __result_last Another random-access iterator.
* @return An iterator indicating the end of the resulting sequence.
*
- * Copies and sorts the smallest N values from the range @p [__first,__last)
- * to the range beginning at @p __result_first, where the number of
- * elements to be copied, @p N, is the smaller of @p (__last-__first) and
- * @p (__result_last-__result_first).
- * After the sort if @e i and @e j are iterators in the range
- * @p [__result_first,__result_first+N) such that i precedes j then
- * *j<*i is false.
- * The value returned is @p __result_first+N.
+ * Copies and sorts the smallest `N` values from the range
+ * `[__first, __last)` to the range beginning at `__result_first`, where
+ * the number of elements to be copied, `N`, is the smaller of
+ * `(__last - __first)` and `(__result_last - __result_first)`.
+ * After the sort if `i` and `j` are iterators in the range
+ * `[__result_first,__result_first + N)` such that `i` precedes `j` then
+ * `*j < *i` is false.
+ * The value returned is `__result_first + N`.
*/
template<typename _InputIterator, typename _RandomAccessIterator>
_GLIBCXX20_CONSTEXPR
* @param __comp A comparison functor.
* @return An iterator indicating the end of the resulting sequence.
*
- * Copies and sorts the smallest N values from the range @p [__first,__last)
- * to the range beginning at @p result_first, where the number of
- * elements to be copied, @p N, is the smaller of @p (__last-__first) and
- * @p (__result_last-__result_first).
- * After the sort if @e i and @e j are iterators in the range
- * @p [__result_first,__result_first+N) such that i precedes j then
- * @p __comp(*j,*i) is false.
- * The value returned is @p __result_first+N.
+ * Copies and sorts the smallest `N` values from the range
+ * `[__first, __last)` to the range beginning at `result_first`, where
+ * the number of elements to be copied, `N`, is the smaller of
+ * `(__last - __first)` and `(__result_last - __result_first)`.
+ * After the sort if `i` and `j` are iterators in the range
+ * `[__result_first, __result_first + N)` such that `i` precedes `j` then
+ * `__comp(*j, *i)` is false.
+ * The value returned is `__result_first + N`.
*/
template<typename _InputIterator, typename _RandomAccessIterator,
typename _Compare>
__gnu_cxx::__ops::__iter_comp_iter(__comp));
}
+ /// @cond undocumented
+
/// This is a helper function for the sort routine.
template<typename _RandomAccessIterator, typename _Compare>
_GLIBCXX20_CONSTEXPR
std::__insertion_sort(__first, __last, __comp);
}
+ /// @endcond
+
// nth_element
// lower_bound moved to stl_algobase.h
/**
- * @brief Finds the first position in which @p __val could be inserted
+ * @brief Finds the first position in which `__val` could be inserted
* without changing the ordering.
* @ingroup binary_search_algorithms
- * @param __first An iterator.
- * @param __last Another iterator.
+ * @param __first An iterator to the start of a sorted range.
+ * @param __last A past-the-end iterator for the sorted range.
* @param __val The search term.
* @param __comp A functor to use for comparisons.
- * @return An iterator pointing to the first element <em>not less
- * than</em> @p __val, or end() if every element is less
- * than @p __val.
+ * @return An iterator pointing to the first element _not less than_
+ * `__val`, or `end()` if every element is less than `__val`.
* @ingroup binary_search_algorithms
*
* The comparison function should have the same effects on ordering as
}
/// This is a helper function for the merge routines.
- template<typename _BidirectionalIterator, typename _Distance,
+ template<typename _BidirectionalIterator, typename _Distance,
typename _Pointer, typename _Compare>
void
__merge_adaptive(_BidirectionalIterator __first,
_BidirectionalIterator __middle,
_BidirectionalIterator __last,
_Distance __len1, _Distance __len2,
- _Pointer __buffer, _Distance __buffer_size,
- _Compare __comp)
+ _Pointer __buffer, _Compare __comp)
{
- if (__len1 <= __len2 && __len1 <= __buffer_size)
+ if (__len1 <= __len2)
{
_Pointer __buffer_end = _GLIBCXX_MOVE3(__first, __middle, __buffer);
std::__move_merge_adaptive(__buffer, __buffer_end, __middle, __last,
__first, __comp);
}
- else if (__len2 <= __buffer_size)
+ else
{
_Pointer __buffer_end = _GLIBCXX_MOVE3(__middle, __last, __buffer);
std::__move_merge_adaptive_backward(__first, __middle, __buffer,
__buffer_end, __last, __comp);
}
+ }
+
+ template<typename _BidirectionalIterator, typename _Distance,
+ typename _Pointer, typename _Compare>
+ void
+ __merge_adaptive_resize(_BidirectionalIterator __first,
+ _BidirectionalIterator __middle,
+ _BidirectionalIterator __last,
+ _Distance __len1, _Distance __len2,
+ _Pointer __buffer, _Distance __buffer_size,
+ _Compare __comp)
+ {
+ if (__len1 <= __buffer_size || __len2 <= __buffer_size)
+ std::__merge_adaptive(__first, __middle, __last,
+ __len1, __len2, __buffer, __comp);
else
{
_BidirectionalIterator __first_cut = __first;
_BidirectionalIterator __new_middle
= std::__rotate_adaptive(__first_cut, __middle, __second_cut,
- __len1 - __len11, __len22, __buffer,
- __buffer_size);
- std::__merge_adaptive(__first, __first_cut, __new_middle, __len11,
- __len22, __buffer, __buffer_size, __comp);
- std::__merge_adaptive(__new_middle, __second_cut, __last,
- __len1 - __len11,
- __len2 - __len22, __buffer,
- __buffer_size, __comp);
+ _Distance(__len1 - __len11), __len22,
+ __buffer, __buffer_size);
+ std::__merge_adaptive_resize(__first, __first_cut, __new_middle,
+ __len11, __len22,
+ __buffer, __buffer_size, __comp);
+ std::__merge_adaptive_resize(__new_middle, __second_cut, __last,
+ _Distance(__len1 - __len11),
+ _Distance(__len2 - __len22),
+ __buffer, __buffer_size, __comp);
}
}
const _DistanceType __len1 = std::distance(__first, __middle);
const _DistanceType __len2 = std::distance(__middle, __last);
+#if _GLIBCXX_HOSTED
typedef _Temporary_buffer<_BidirectionalIterator, _ValueType> _TmpBuf;
- _TmpBuf __buf(__first, __len1 + __len2);
+ // __merge_adaptive will use a buffer for the smaller of
+ // [first,middle) and [middle,last).
+ _TmpBuf __buf(__first, std::min(__len1, __len2));
- if (__buf.begin() == 0)
+ if (__builtin_expect(__buf.size() == __buf.requested_size(), true))
+ std::__merge_adaptive
+ (__first, __middle, __last, __len1, __len2, __buf.begin(), __comp);
+ else if (__builtin_expect(__buf.begin() == 0, false))
std::__merge_without_buffer
(__first, __middle, __last, __len1, __len2, __comp);
else
- std::__merge_adaptive
+ std::__merge_adaptive_resize
(__first, __middle, __last, __len1, __len2, __buf.begin(),
_DistanceType(__buf.size()), __comp);
+#else
+ std::__merge_without_buffer
+ (__first, __middle, __last, __len1, __len2, __comp);
+#endif
}
/**
}
}
- template<typename _RandomAccessIterator, typename _Pointer,
- typename _Distance, typename _Compare>
+ template<typename _RandomAccessIterator, typename _Pointer, typename _Compare>
void
__stable_sort_adaptive(_RandomAccessIterator __first,
+ _RandomAccessIterator __middle,
_RandomAccessIterator __last,
- _Pointer __buffer, _Distance __buffer_size,
- _Compare __comp)
+ _Pointer __buffer, _Compare __comp)
+ {
+ std::__merge_sort_with_buffer(__first, __middle, __buffer, __comp);
+ std::__merge_sort_with_buffer(__middle, __last, __buffer, __comp);
+
+ std::__merge_adaptive(__first, __middle, __last,
+ __middle - __first, __last - __middle,
+ __buffer, __comp);
+ }
+
+ template<typename _RandomAccessIterator, typename _Pointer,
+ typename _Distance, typename _Compare>
+ void
+ __stable_sort_adaptive_resize(_RandomAccessIterator __first,
+ _RandomAccessIterator __last,
+ _Pointer __buffer, _Distance __buffer_size,
+ _Compare __comp)
{
const _Distance __len = (__last - __first + 1) / 2;
const _RandomAccessIterator __middle = __first + __len;
if (__len > __buffer_size)
{
- std::__stable_sort_adaptive(__first, __middle, __buffer,
- __buffer_size, __comp);
- std::__stable_sort_adaptive(__middle, __last, __buffer,
- __buffer_size, __comp);
+ std::__stable_sort_adaptive_resize(__first, __middle, __buffer,
+ __buffer_size, __comp);
+ std::__stable_sort_adaptive_resize(__middle, __last, __buffer,
+ __buffer_size, __comp);
+ std::__merge_adaptive_resize(__first, __middle, __last,
+ _Distance(__middle - __first),
+ _Distance(__last - __middle),
+ __buffer, __buffer_size,
+ __comp);
}
else
- {
- std::__merge_sort_with_buffer(__first, __middle, __buffer, __comp);
- std::__merge_sort_with_buffer(__middle, __last, __buffer, __comp);
- }
- std::__merge_adaptive(__first, __middle, __last,
- _Distance(__middle - __first),
- _Distance(__last - __middle),
- __buffer, __buffer_size,
- __comp);
+ std::__stable_sort_adaptive(__first, __middle, __last,
+ __buffer, __comp);
}
/// This is a helper function for the stable sorting routines.
_Compare __comp)
{
while (__first1 != __last1 && __first2 != __last2)
- if (__comp(__first2, __first1))
- return false;
- else if (__comp(__first1, __first2))
- ++__first1;
- else
- {
- ++__first1;
+ {
+ if (__comp(__first2, __first1))
+ return false;
+ if (!__comp(__first1, __first2))
++__first2;
- }
+ ++__first1;
+ }
return __first2 == __last2;
}
__new_value);
}
- template<typename _InputIterator, typename _Predicate>
- _GLIBCXX20_CONSTEXPR
- typename iterator_traits<_InputIterator>::difference_type
- __count_if(_InputIterator __first, _InputIterator __last, _Predicate __pred)
- {
- typename iterator_traits<_InputIterator>::difference_type __n = 0;
- for (; __first != __last; ++__first)
- if (__pred(__first))
- ++__n;
- return __n;
- }
-
#if __cplusplus >= 201103L
/**
* @brief Determines whether the elements of a sequence are sorted.
__gnu_cxx::__ops::__iter_comp_iter(__comp));
}
- // N2722 + DR 915.
- template<typename _Tp>
- _GLIBCXX14_CONSTEXPR
- inline _Tp
- min(initializer_list<_Tp> __l)
- { return *std::min_element(__l.begin(), __l.end()); }
-
- template<typename _Tp, typename _Compare>
- _GLIBCXX14_CONSTEXPR
- inline _Tp
- min(initializer_list<_Tp> __l, _Compare __comp)
- { return *std::min_element(__l.begin(), __l.end(), __comp); }
-
- template<typename _Tp>
- _GLIBCXX14_CONSTEXPR
- inline _Tp
- max(initializer_list<_Tp> __l)
- { return *std::max_element(__l.begin(), __l.end()); }
-
- template<typename _Tp, typename _Compare>
- _GLIBCXX14_CONSTEXPR
- inline _Tp
- max(initializer_list<_Tp> __l, _Compare __comp)
- { return *std::max_element(__l.begin(), __l.end(), __comp); }
-
template<typename _Tp>
_GLIBCXX14_CONSTEXPR
inline pair<_Tp, _Tp>
minmax(initializer_list<_Tp> __l)
{
+ __glibcxx_requires_irreflexive(__l.begin(), __l.end());
pair<const _Tp*, const _Tp*> __p =
- std::minmax_element(__l.begin(), __l.end());
+ std::__minmax_element(__l.begin(), __l.end(),
+ __gnu_cxx::__ops::__iter_less_iter());
return std::make_pair(*__p.first, *__p.second);
}
inline pair<_Tp, _Tp>
minmax(initializer_list<_Tp> __l, _Compare __comp)
{
+ __glibcxx_requires_irreflexive_pred(__l.begin(), __l.end(), __comp);
pair<const _Tp*, const _Tp*> __p =
- std::minmax_element(__l.begin(), __l.end(), __comp);
+ std::__minmax_element(__l.begin(), __l.end(),
+ __gnu_cxx::__ops::__iter_comp_iter(__comp));
return std::make_pair(*__p.first, *__p.second);
}
- template<typename _ForwardIterator1, typename _ForwardIterator2,
- typename _BinaryPredicate>
- _GLIBCXX20_CONSTEXPR
- bool
- __is_permutation(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
- _ForwardIterator2 __first2, _BinaryPredicate __pred)
- {
- // Efficiently compare identical prefixes: O(N) if sequences
- // have the same elements in the same order.
- for (; __first1 != __last1; ++__first1, (void)++__first2)
- if (!__pred(__first1, __first2))
- break;
-
- if (__first1 == __last1)
- return true;
-
- // Establish __last2 assuming equal ranges by iterating over the
- // rest of the list.
- _ForwardIterator2 __last2 = __first2;
- std::advance(__last2, std::distance(__first1, __last1));
- for (_ForwardIterator1 __scan = __first1; __scan != __last1; ++__scan)
- {
- if (__scan != std::__find_if(__first1, __scan,
- __gnu_cxx::__ops::__iter_comp_iter(__pred, __scan)))
- continue; // We've seen this one before.
-
- auto __matches
- = std::__count_if(__first2, __last2,
- __gnu_cxx::__ops::__iter_comp_iter(__pred, __scan));
- if (0 == __matches ||
- std::__count_if(__scan, __last1,
- __gnu_cxx::__ops::__iter_comp_iter(__pred, __scan))
- != __matches)
- return false;
- }
- return true;
- }
-
- /**
- * @brief Checks whether a permutation of the second sequence is equal
- * to the first sequence.
- * @ingroup non_mutating_algorithms
- * @param __first1 Start of first range.
- * @param __last1 End of first range.
- * @param __first2 Start of second range.
- * @return true if there exists a permutation of the elements in the range
- * [__first2, __first2 + (__last1 - __first1)), beginning with
- * ForwardIterator2 begin, such that equal(__first1, __last1, begin)
- * returns true; otherwise, returns false.
- */
- template<typename _ForwardIterator1, typename _ForwardIterator2>
- _GLIBCXX20_CONSTEXPR
- inline bool
- is_permutation(_ForwardIterator1 __first1, _ForwardIterator1 __last1,
- _ForwardIterator2 __first2)
- {
- // concept requirements
- __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator1>)
- __glibcxx_function_requires(_ForwardIteratorConcept<_ForwardIterator2>)
- __glibcxx_function_requires(_EqualOpConcept<
- typename iterator_traits<_ForwardIterator1>::value_type,
- typename iterator_traits<_ForwardIterator2>::value_type>)
- __glibcxx_requires_valid_range(__first1, __last1);
-
- return std::__is_permutation(__first1, __last1, __first2,
- __gnu_cxx::__ops::__iter_equal_to_iter());
- }
-
/**
* @brief Checks whether a permutation of the second sequence is equal
* to the first sequence.
__gnu_cxx::__ops::__iter_comp_iter(__pred));
}
-#if __cplusplus > 201402L
+#if __cplusplus >= 201703L
-#define __cpp_lib_clamp 201603
+#define __cpp_lib_clamp 201603L
/**
* @brief Returns the value clamped between lo and hi.
* @param __val A value of arbitrary type.
* @param __lo A lower limit of arbitrary type.
* @param __hi An upper limit of arbitrary type.
- * @return max(__val, __lo) if __val < __hi or min(__val, __hi) otherwise.
+ * @retval `__lo` if `__val < __lo`
+ * @retval `__hi` if `__hi < __val`
+ * @retval `__val` otherwise.
+ * @pre `_Tp` is LessThanComparable and `(__hi < __lo)` is false.
*/
template<typename _Tp>
constexpr const _Tp&
clamp(const _Tp& __val, const _Tp& __lo, const _Tp& __hi)
{
__glibcxx_assert(!(__hi < __lo));
- return (__val < __lo) ? __lo : (__hi < __val) ? __hi : __val;
+ return std::min(std::max(__val, __lo), __hi);
}
/**
* @param __lo A lower limit of arbitrary type.
* @param __hi An upper limit of arbitrary type.
* @param __comp A comparison functor.
- * @return max(__val, __lo, __comp) if __comp(__val, __hi)
- * or min(__val, __hi, __comp) otherwise.
+ * @retval `__lo` if `__comp(__val, __lo)`
+ * @retval `__hi` if `__comp(__hi, __val)`
+ * @retval `__val` otherwise.
+ * @pre `__comp(__hi, __lo)` is false.
*/
template<typename _Tp, typename _Compare>
constexpr const _Tp&
clamp(const _Tp& __val, const _Tp& __lo, const _Tp& __hi, _Compare __comp)
{
__glibcxx_assert(!__comp(__hi, __lo));
- return __comp(__val, __lo) ? __lo : __comp(__hi, __val) ? __hi : __val;
+ return std::min(std::max(__val, __lo, __comp), __hi, __comp);
}
#endif // C++17
#endif // C++14
for (_RandomAccessIterator __i = __first + 1; __i != __last; ++__i)
std::iter_swap(__i, __first + __d(__g, __p_type(0, __i - __first)));
}
-#endif
+#endif // USE C99_STDINT
#endif // C++11
* If `__f` has a return value it is ignored.
*/
template<typename _InputIterator, typename _Size, typename _Function>
+ _GLIBCXX20_CONSTEXPR
_InputIterator
for_each_n(_InputIterator __first, _Size __n, _Function __f)
{
using _Cat = typename iterator_traits<_InputIterator>::iterator_category;
if constexpr (is_base_of_v<random_access_iterator_tag, _Cat>)
{
+ if (__n2 <= 0)
+ return __first;
auto __last = __first + __n2;
std::for_each(__first, __last, std::move(__f));
return __last;
__gnu_cxx::__ops::__iter_comp_val(__binary_pred, __val));
}
-#if __cplusplus > 201402L
+#if __cplusplus >= 201703L
/** @brief Search a sequence using a Searcher object.
*
* @param __first A forward iterator.
* @return @p __searcher(__first,__last).first
*/
template<typename _ForwardIterator, typename _Searcher>
+ _GLIBCXX20_CONSTEXPR
inline _ForwardIterator
search(_ForwardIterator __first, _ForwardIterator __last,
const _Searcher& __searcher)
* @param __new_value The replacement value.
* @return replace() returns no value.
*
- * For each iterator @c i in the range @p [__first,__last) if @c *i ==
- * @p __old_value then the assignment @c *i = @p __new_value is performed.
+ * For each iterator `i` in the range `[__first,__last)` if
+ * `*i == __old_value` then the assignment `*i = __new_value` is performed.
*/
template<typename _ForwardIterator, typename _Tp>
_GLIBCXX20_CONSTEXPR
* @param __new_value The replacement value.
* @return replace_if() returns no value.
*
- * For each iterator @c i in the range @p [__first,__last) if @p __pred(*i)
- * is true then the assignment @c *i = @p __new_value is performed.
+ * For each iterator `i` in the range `[__first,__last)` if `__pred(*i)`
+ * is true then the assignment `*i = __new_value` is performed.
*/
template<typename _ForwardIterator, typename _Predicate, typename _Tp>
_GLIBCXX20_CONSTEXPR
* @ingroup mutating_algorithms
* @param __first A forward iterator.
* @param __last A forward iterator.
- * @param __gen A function object taking no arguments and returning
- * std::iterator_traits<_ForwardIterator>::value_type
+ * @param __gen A function object callable with no arguments.
* @return generate() returns no value.
*
- * Performs the assignment @c *i = @p __gen() for each @c i in the range
- * @p [__first,__last).
+ * Performs the assignment `*i = __gen()` for each `i` in the range
+ * `[__first, __last)`.
*/
template<typename _ForwardIterator, typename _Generator>
_GLIBCXX20_CONSTEXPR
* @ingroup mutating_algorithms
* @param __first A forward iterator.
* @param __n The length of the sequence.
- * @param __gen A function object taking no arguments and returning
- * std::iterator_traits<_ForwardIterator>::value_type
- * @return The end of the sequence, @p __first+__n
+ * @param __gen A function object callable with no arguments.
+ * @return The end of the sequence, i.e., `__first + __n`
*
- * Performs the assignment @c *i = @p __gen() for each @c i in the range
- * @p [__first,__first+__n).
+ * Performs the assignment `*i = __gen()` for each `i` in the range
+ * `[__first, __first + __n)`.
*
- * If @p __n is negative, the function does nothing and returns @p __first.
+ * If `__n` is negative, the function does nothing and returns `__first`.
*/
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// DR 865. More algorithms that throw away information
* @param __result An output iterator.
* @return An iterator designating the end of the resulting sequence.
*
- * Copies each element in the range @p [__first,__last) to the range
- * beginning at @p __result, except that only the first element is copied
+ * Copies each element in the range `[__first, __last)` to the range
+ * beginning at `__result`, except that only the first element is copied
* from groups of consecutive elements that compare equal.
- * unique_copy() is stable, so the relative order of elements that are
+ * `unique_copy()` is stable, so the relative order of elements that are
* copied is unchanged.
- *
- * _GLIBCXX_RESOLVE_LIB_DEFECTS
- * DR 241. Does unique_copy() require CopyConstructible and Assignable?
- *
- * _GLIBCXX_RESOLVE_LIB_DEFECTS
- * DR 538. 241 again: Does unique_copy() require CopyConstructible and
- * Assignable?
- */
+ */
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // DR 241. Does unique_copy() require CopyConstructible and Assignable?
+ // DR 538. 241 again: Does unique_copy() require CopyConstructible and
+ // Assignable?
template<typename _InputIterator, typename _OutputIterator>
_GLIBCXX20_CONSTEXPR
inline _OutputIterator
* @param __binary_pred A binary predicate.
* @return An iterator designating the end of the resulting sequence.
*
- * Copies each element in the range @p [__first,__last) to the range
- * beginning at @p __result, except that only the first element is copied
- * from groups of consecutive elements for which @p __binary_pred returns
+ * Copies each element in the range `[__first, __last)` to the range
+ * beginning at `__result`, except that only the first element is copied
+ * from groups of consecutive elements for which `__binary_pred` returns
* true.
- * unique_copy() is stable, so the relative order of elements that are
+ * `unique_copy()` is stable, so the relative order of elements that are
* copied is unchanged.
- *
- * _GLIBCXX_RESOLVE_LIB_DEFECTS
- * DR 241. Does unique_copy() require CopyConstructible and Assignable?
- */
+ */
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // DR 241. Does unique_copy() require CopyConstructible and Assignable?
template<typename _InputIterator, typename _OutputIterator,
typename _BinaryPredicate>
_GLIBCXX20_CONSTEXPR
std::__iterator_category(__result));
}
+#if __cplusplus <= 201103L || _GLIBCXX_USE_DEPRECATED
#if _GLIBCXX_HOSTED
/**
* @brief Randomly shuffle the elements of a sequence.
* @param __last A forward iterator.
* @return Nothing.
*
- * Reorder the elements in the range @p [__first,__last) using a random
+ * Reorder the elements in the range `[__first, __last)` using a random
* distribution, so that every possible ordering of the sequence is
* equally likely.
+ *
+ * @deprecated
+ * Since C++14 `std::random_shuffle` is not part of the C++ standard.
+ * Use `std::shuffle` instead, which was introduced in C++11.
*/
template<typename _RandomAccessIterator>
+ _GLIBCXX14_DEPRECATED_SUGGEST("std::shuffle")
inline void
random_shuffle(_RandomAccessIterator __first, _RandomAccessIterator __last)
{
std::iter_swap(__i, __j);
}
}
-#endif
/**
* @brief Shuffle the elements of a sequence using a random number
* @param __rand The RNG functor or function.
* @return Nothing.
*
- * Reorders the elements in the range @p [__first,__last) using @p __rand to
- * provide a random distribution. Calling @p __rand(N) for a positive
- * integer @p N should return a randomly chosen integer from the
- * range [0,N).
+ * Reorders the elements in the range `[__first, __last)` using `__rand`
+ * to provide a random distribution. Calling `__rand(N)` for a positive
+ * integer `N` should return a randomly chosen integer from the
+ * range `[0, N)`.
+ *
+ * @deprecated
+ * Since C++14 `std::random_shuffle` is not part of the C++ standard.
+ * Use `std::shuffle` instead, which was introduced in C++11.
*/
template<typename _RandomAccessIterator, typename _RandomNumberGenerator>
+ _GLIBCXX14_DEPRECATED_SUGGEST("std::shuffle")
void
random_shuffle(_RandomAccessIterator __first, _RandomAccessIterator __last,
#if __cplusplus >= 201103L
std::iter_swap(__i, __j);
}
}
-
+#endif // HOSTED
+#endif // C++11 || USE_DEPRECATED
/**
* @brief Move elements for which a predicate is true to the beginning
* @param __first A forward iterator.
* @param __last A forward iterator.
* @param __pred A predicate functor.
- * @return An iterator @p middle such that @p __pred(i) is true for each
- * iterator @p i in the range @p [__first,middle) and false for each @p i
- * in the range @p [middle,__last).
+ * @return An iterator `middle` such that `__pred(i)` is true for each
+ * iterator `i` in the range `[__first, middle)` and false for each `i`
+ * in the range `[middle, __last)`.
*
- * @p __pred must not modify its operand. @p partition() does not preserve
+ * `__pred` must not modify its operand. `partition()` does not preserve
* the relative ordering of elements in each group, use
- * @p stable_partition() if this is needed.
+ * `stable_partition()` if this is needed.
*/
template<typename _ForwardIterator, typename _Predicate>
_GLIBCXX20_CONSTEXPR
* @param __last Another iterator.
* @return Nothing.
*
- * Sorts the smallest @p (__middle-__first) elements in the range
- * @p [first,last) and moves them to the range @p [__first,__middle). The
- * order of the remaining elements in the range @p [__middle,__last) is
- * undefined.
- * After the sort if @e i and @e j are iterators in the range
- * @p [__first,__middle) such that i precedes j and @e k is an iterator in
- * the range @p [__middle,__last) then *j<*i and *k<*i are both false.
+ * Sorts the smallest `(__middle - __first)` elements in the range
+ * `[first, last)` and moves them to the range `[__first, __middle)`. The
+ * order of the remaining elements in the range `[__middle, __last)` is
+ * unspecified.
+ * After the sort if `i` and `j` are iterators in the range
+ * `[__first, __middle)` such that `i` precedes `j` and `k` is an iterator
+ * in the range `[__middle, __last)` then `*j < *i` and `*k < *i` are
+ * both false.
*/
template<typename _RandomAccessIterator>
_GLIBCXX20_CONSTEXPR
* @param __comp A comparison functor.
* @return Nothing.
*
- * Sorts the smallest @p (__middle-__first) elements in the range
- * @p [__first,__last) and moves them to the range @p [__first,__middle). The
- * order of the remaining elements in the range @p [__middle,__last) is
- * undefined.
- * After the sort if @e i and @e j are iterators in the range
- * @p [__first,__middle) such that i precedes j and @e k is an iterator in
- * the range @p [__middle,__last) then @p *__comp(j,*i) and @p __comp(*k,*i)
- * are both false.
+ * Sorts the smallest `(__middle - __first)` elements in the range
+ * `[__first, __last)` and moves them to the range `[__first, __middle)`.
+ * The order of the remaining elements in the range `[__middle, __last)` is
+ * unspecified.
+ * After the sort if `i` and `j` are iterators in the range
+ * `[__first, __middle)` such that `i` precedes `j` and `k` is an iterator
+ * in the range `[__middle, __last)` then `*__comp(j, *i)` and
+ * `__comp(*k, *i)` are both false.
*/
template<typename _RandomAccessIterator, typename _Compare>
_GLIBCXX20_CONSTEXPR
* @param __last Another iterator.
* @return Nothing.
*
- * Rearranges the elements in the range @p [__first,__last) so that @p *__nth
+ * Rearranges the elements in the range `[__first, __last)` so that `*__nth`
* is the same element that would have been in that position had the
- * whole sequence been sorted. The elements either side of @p *__nth are
- * not completely sorted, but for any iterator @e i in the range
- * @p [__first,__nth) and any iterator @e j in the range @p [__nth,__last) it
- * holds that *j < *i is false.
+ * whole sequence been sorted. The elements either side of `*__nth` are
+ * not completely sorted, but for any iterator `i` in the range
+ * `[__first, __nth)` and any iterator `j` in the range `[__nth, __last)` it
+ * holds that `*j < *i` is false.
*/
template<typename _RandomAccessIterator>
_GLIBCXX20_CONSTEXPR
* @param __comp A comparison functor.
* @return Nothing.
*
- * Rearranges the elements in the range @p [__first,__last) so that @p *__nth
+ * Rearranges the elements in the range `[__first, __last)` so that `*__nth`
* is the same element that would have been in that position had the
- * whole sequence been sorted. The elements either side of @p *__nth are
- * not completely sorted, but for any iterator @e i in the range
- * @p [__first,__nth) and any iterator @e j in the range @p [__nth,__last) it
- * holds that @p __comp(*j,*i) is false.
+ * whole sequence been sorted. The elements either side of `*__nth` are
+ * not completely sorted, but for any iterator `i` in the range
+ * `[__first, __nth)` and any iterator `j` in the range `[__nth, __last)`
+ * it holds that `__comp(*j, *i)` is false.
*/
template<typename _RandomAccessIterator, typename _Compare>
_GLIBCXX20_CONSTEXPR
* @param __last Another iterator.
* @return Nothing.
*
- * Sorts the elements in the range @p [__first,__last) in ascending order,
- * such that for each iterator @e i in the range @p [__first,__last-1),
- * *(i+1)<*i is false.
+ * Sorts the elements in the range `[__first, __last)` in ascending order,
+ * such that for each iterator `i` in the range `[__first, __last - 1)`,
+ * `*(i+1) < *i` is false.
*
* The relative ordering of equivalent elements is not preserved, use
- * @p stable_sort() if this is needed.
+ * `stable_sort()` if this is needed.
*/
template<typename _RandomAccessIterator>
_GLIBCXX20_CONSTEXPR
* @param __comp A comparison functor.
* @return Nothing.
*
- * Sorts the elements in the range @p [__first,__last) in ascending order,
- * such that @p __comp(*(i+1),*i) is false for every iterator @e i in the
- * range @p [__first,__last-1).
+ * Sorts the elements in the range `[__first, __last)` in ascending order,
+ * such that `__comp(*(i+1), *i)` is false for every iterator `i` in the
+ * range `[__first, __last - 1)`.
*
* The relative ordering of equivalent elements is not preserved, use
- * @p stable_sort() if this is needed.
+ * `stable_sort()` if this is needed.
*/
template<typename _RandomAccessIterator, typename _Compare>
_GLIBCXX20_CONSTEXPR
typedef typename iterator_traits<_RandomAccessIterator>::difference_type
_DistanceType;
- typedef _Temporary_buffer<_RandomAccessIterator, _ValueType> _TmpBuf;
- _TmpBuf __buf(__first, std::distance(__first, __last));
+ if (__first == __last)
+ return;
- if (__buf.begin() == 0)
+#if _GLIBCXX_HOSTED
+ typedef _Temporary_buffer<_RandomAccessIterator, _ValueType> _TmpBuf;
+ // __stable_sort_adaptive sorts the range in two halves,
+ // so the buffer only needs to fit half the range at once.
+ _TmpBuf __buf(__first, (__last - __first + 1) / 2);
+
+ if (__builtin_expect(__buf.requested_size() == __buf.size(), true))
+ std::__stable_sort_adaptive(__first,
+ __first + _DistanceType(__buf.size()),
+ __last, __buf.begin(), __comp);
+ else if (__builtin_expect(__buf.begin() == 0, false))
std::__inplace_stable_sort(__first, __last, __comp);
else
- std::__stable_sort_adaptive(__first, __last, __buf.begin(),
- _DistanceType(__buf.size()), __comp);
+ std::__stable_sort_adaptive_resize(__first, __last, __buf.begin(),
+ _DistanceType(__buf.size()), __comp);
+#else
+ std::__inplace_stable_sort(__first, __last, __comp);
+#endif
}
/**
__gnu_cxx::__ops::__iter_comp_iter(__comp));
}
+#if __cplusplus >= 201103L
+ // N2722 + DR 915.
+ template<typename _Tp>
+ _GLIBCXX14_CONSTEXPR
+ inline _Tp
+ min(initializer_list<_Tp> __l)
+ {
+ __glibcxx_requires_irreflexive(__l.begin(), __l.end());
+ return *_GLIBCXX_STD_A::__min_element(__l.begin(), __l.end(),
+ __gnu_cxx::__ops::__iter_less_iter());
+ }
+
+ template<typename _Tp, typename _Compare>
+ _GLIBCXX14_CONSTEXPR
+ inline _Tp
+ min(initializer_list<_Tp> __l, _Compare __comp)
+ {
+ __glibcxx_requires_irreflexive_pred(__l.begin(), __l.end(), __comp);
+ return *_GLIBCXX_STD_A::__min_element(__l.begin(), __l.end(),
+ __gnu_cxx::__ops::__iter_comp_iter(__comp));
+ }
+
+ template<typename _Tp>
+ _GLIBCXX14_CONSTEXPR
+ inline _Tp
+ max(initializer_list<_Tp> __l)
+ {
+ __glibcxx_requires_irreflexive(__l.begin(), __l.end());
+ return *_GLIBCXX_STD_A::__max_element(__l.begin(), __l.end(),
+ __gnu_cxx::__ops::__iter_less_iter());
+ }
+
+ template<typename _Tp, typename _Compare>
+ _GLIBCXX14_CONSTEXPR
+ inline _Tp
+ max(initializer_list<_Tp> __l, _Compare __comp)
+ {
+ __glibcxx_requires_irreflexive_pred(__l.begin(), __l.end(), __comp);
+ return *_GLIBCXX_STD_A::__max_element(__l.begin(), __l.end(),
+ __gnu_cxx::__ops::__iter_comp_iter(__comp));
+ }
+#endif // C++11
+
#if __cplusplus >= 201402L
/// Reservoir sampling algorithm.
template<typename _InputIterator, typename _RandomAccessIterator,
using _Gen = remove_reference_t<_UniformRandomBitGenerator>;
using __uc_type = common_type_t<typename _Gen::result_type, _USize>;
+ if (__first == __last)
+ return __out;
+
__distrib_type __d{};
_Size __unsampled_sz = std::distance(__first, __last);
__n = std::min(__n, __unsampled_sz);
}
#if __cplusplus > 201402L
-#define __cpp_lib_sample 201603
+#define __cpp_lib_sample 201603L
/// Take a random sample from a population.
template<typename _PopulationIterator, typename _SampleIterator,
typename _Distance, typename _UniformRandomBitGenerator>
projects / thirdparty / gcc.git / blobdiff