algobase.h
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// -*- C++ -*- // Copyright (C) 2007-2018 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/>. /** @file parallel/algobase.h * @brief Parallel STL function calls corresponding to the * stl_algobase.h header. The functions defined here mainly do case * switches and call the actual parallelized versions in other files. * Inlining policy: Functions that basically only contain one * function call, are declared inline. * This file is a GNU parallel extension to the Standard C++ Library. */ // Written by Johannes Singler and Felix Putze. #ifndef _GLIBCXX_PARALLEL_ALGOBASE_H #define _GLIBCXX_PARALLEL_ALGOBASE_H 1 #include <bits/stl_algobase.h> #include <parallel/base.h> #include <parallel/algorithmfwd.h> #include <parallel/find.h> #include <parallel/find_selectors.h> namespace std _GLIBCXX_VISIBILITY(default) { namespace __parallel { // NB: equal and lexicographical_compare require mismatch. // Sequential fallback template<typename _IIter1, typename _IIter2> inline pair<_IIter1, _IIter2> mismatch(_IIter1 __begin1, _IIter1 __end1, _IIter2 __begin2, __gnu_parallel::sequential_tag) { return _GLIBCXX_STD_A::mismatch(__begin1, __end1, __begin2); } // Sequential fallback template<typename _IIter1, typename _IIter2, typename _Predicate> inline pair<_IIter1, _IIter2> mismatch(_IIter1 __begin1, _IIter1 __end1, _IIter2 __begin2, _Predicate __pred, __gnu_parallel::sequential_tag) { return _GLIBCXX_STD_A::mismatch(__begin1, __end1, __begin2, __pred); } // Sequential fallback for input iterator case template<typename _IIter1, typename _IIter2, typename _Predicate, typename _IteratorTag1, typename _IteratorTag2> inline pair<_IIter1, _IIter2> __mismatch_switch(_IIter1 __begin1, _IIter1 __end1, _IIter2 __begin2, _Predicate __pred, _IteratorTag1, _IteratorTag2) { return _GLIBCXX_STD_A::mismatch(__begin1, __end1, __begin2, __pred); } // Parallel mismatch for random access iterators template<typename _RAIter1, typename _RAIter2, typename _Predicate> pair<_RAIter1, _RAIter2> __mismatch_switch(_RAIter1 __begin1, _RAIter1 __end1, _RAIter2 __begin2, _Predicate __pred, random_access_iterator_tag, random_access_iterator_tag) { if (_GLIBCXX_PARALLEL_CONDITION(true)) { _RAIter1 __res = __gnu_parallel::__find_template(__begin1, __end1, __begin2, __pred, __gnu_parallel:: __mismatch_selector()).first; return make_pair(__res , __begin2 + (__res - __begin1)); } else return _GLIBCXX_STD_A::mismatch(__begin1, __end1, __begin2, __pred); } // Public interface template<typename _IIter1, typename _IIter2> inline pair<_IIter1, _IIter2> mismatch(_IIter1 __begin1, _IIter1 __end1, _IIter2 __begin2) { typedef __gnu_parallel::_EqualTo< typename std::iterator_traits<_IIter1>::value_type, typename std::iterator_traits<_IIter2>::value_type> _EqualTo; return __mismatch_switch(__begin1, __end1, __begin2, _EqualTo(), std::__iterator_category(__begin1), std::__iterator_category(__begin2)); } // Public interface template<typename _IIter1, typename _IIter2, typename _Predicate> inline pair<_IIter1, _IIter2> mismatch(_IIter1 __begin1, _IIter1 __end1, _IIter2 __begin2, _Predicate __pred) { return __mismatch_switch(__begin1, __end1, __begin2, __pred, std::__iterator_category(__begin1), std::__iterator_category(__begin2)); } #if __cplusplus > 201103L // Sequential fallback. template<typename _InputIterator1, typename _InputIterator2> inline pair<_InputIterator1, _InputIterator2> mismatch(_InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2, _InputIterator2 __last2, __gnu_parallel::sequential_tag) { return _GLIBCXX_STD_A::mismatch(__first1, __last1, __first2, __last2); } // Sequential fallback. template<typename _InputIterator1, typename _InputIterator2, typename _BinaryPredicate> inline pair<_InputIterator1, _InputIterator2> mismatch(_InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2, _InputIterator2 __last2, _BinaryPredicate __binary_pred, __gnu_parallel::sequential_tag) { return _GLIBCXX_STD_A::mismatch(__first1, __last1, __first2, __last2, __binary_pred); } // Sequential fallback for input iterator case template<typename _IIter1, typename _IIter2, typename _Predicate, typename _IteratorTag1, typename _IteratorTag2> inline pair<_IIter1, _IIter2> __mismatch_switch(_IIter1 __begin1, _IIter1 __end1, _IIter2 __begin2, _IIter2 __end2, _Predicate __pred, _IteratorTag1, _IteratorTag2) { return _GLIBCXX_STD_A::mismatch(__begin1, __end1, __begin2, __end2, __pred); } // Parallel mismatch for random access iterators template<typename _RAIter1, typename _RAIter2, typename _Predicate> pair<_RAIter1, _RAIter2> __mismatch_switch(_RAIter1 __begin1, _RAIter1 __end1, _RAIter2 __begin2, _RAIter2 __end2, _Predicate __pred, random_access_iterator_tag, random_access_iterator_tag) { if (_GLIBCXX_PARALLEL_CONDITION(true)) { if ((__end2 - __begin2) < (__end1 - __begin1)) __end1 = __begin1 + (__end2 - __begin2); _RAIter1 __res = __gnu_parallel::__find_template(__begin1, __end1, __begin2, __pred, __gnu_parallel:: __mismatch_selector()).first; return make_pair(__res , __begin2 + (__res - __begin1)); } else return _GLIBCXX_STD_A::mismatch(__begin1, __end1, __begin2, __end2, __pred); } template<typename _IIter1, typename _IIter2> inline pair<_IIter1, _IIter2> mismatch(_IIter1 __begin1, _IIter1 __end1, _IIter2 __begin2, _IIter2 __end2) { typedef __gnu_parallel::_EqualTo< typename std::iterator_traits<_IIter1>::value_type, typename std::iterator_traits<_IIter2>::value_type> _EqualTo; return __mismatch_switch(__begin1, __end1, __begin2, __end2, _EqualTo(), std::__iterator_category(__begin1), std::__iterator_category(__begin2)); } template<typename _InputIterator1, typename _InputIterator2, typename _BinaryPredicate> inline pair<_InputIterator1, _InputIterator2> mismatch(_InputIterator1 __begin1, _InputIterator1 __end1, _InputIterator2 __begin2, _InputIterator2 __end2, _BinaryPredicate __binary_pred) { return __mismatch_switch(__begin1, __end1, __begin2, __end2, __binary_pred, std::__iterator_category(__begin1), std::__iterator_category(__begin2)); } #endif // Sequential fallback template<typename _IIter1, typename _IIter2> inline bool equal(_IIter1 __begin1, _IIter1 __end1, _IIter2 __begin2, __gnu_parallel::sequential_tag) { return _GLIBCXX_STD_A::equal(__begin1, __end1, __begin2); } // Sequential fallback template<typename _IIter1, typename _IIter2, typename _Predicate> inline bool equal(_IIter1 __begin1, _IIter1 __end1, _IIter2 __begin2, _Predicate __pred, __gnu_parallel::sequential_tag) { return _GLIBCXX_STD_A::equal(__begin1, __end1, __begin2, __pred); } // Public interface template<typename _IIter1, typename _IIter2> inline bool equal(_IIter1 __begin1, _IIter1 __end1, _IIter2 __begin2) { return __gnu_parallel::mismatch(__begin1, __end1, __begin2).first == __end1; } // Public interface template<typename _IIter1, typename _IIter2, typename _Predicate> inline bool equal(_IIter1 __begin1, _IIter1 __end1, _IIter2 __begin2, _Predicate __pred) { return __gnu_parallel::mismatch(__begin1, __end1, __begin2, __pred).first == __end1; } #if __cplusplus > 201103L // Sequential fallback template<typename _IIter1, typename _IIter2> inline bool equal(_IIter1 __begin1, _IIter1 __end1, _IIter2 __begin2, _IIter2 __end2, __gnu_parallel::sequential_tag) { return _GLIBCXX_STD_A::equal(__begin1, __end1, __begin2, __end2); } // Sequential fallback template<typename _IIter1, typename _IIter2, typename _BinaryPredicate> inline bool equal(_IIter1 __begin1, _IIter1 __end1, _IIter2 __begin2, _IIter2 __end2, _BinaryPredicate __binary_pred, __gnu_parallel::sequential_tag) { return _GLIBCXX_STD_A::equal(__begin1, __end1, __begin2, __end2, __binary_pred); } // Sequential fallback for input iterator case template<typename _IIter1, typename _IIter2, typename _Predicate, typename _IteratorTag1, typename _IteratorTag2> inline bool __equal_switch(_IIter1 __begin1, _IIter1 __end1, _IIter2 __begin2, _IIter2 __end2, _Predicate __pred, _IteratorTag1, _IteratorTag2) { return _GLIBCXX_STD_A::equal(__begin1, __end1, __begin2, __end2, __pred); } // Parallel equal for random access iterators template<typename _RAIter1, typename _RAIter2, typename _Predicate> inline bool __equal_switch(_RAIter1 __begin1, _RAIter1 __end1, _RAIter2 __begin2, _RAIter2 __end2, _Predicate __pred, random_access_iterator_tag, random_access_iterator_tag) { if (_GLIBCXX_PARALLEL_CONDITION(true)) { if (std::distance(__begin1, __end1) != std::distance(__begin2, __end2)) return false; return __gnu_parallel::mismatch(__begin1, __end1, __begin2, __end2, __pred).first == __end1; } else return _GLIBCXX_STD_A::equal(__begin1, __end1, __begin2, __end2, __pred); } template<typename _IIter1, typename _IIter2> inline bool equal(_IIter1 __begin1, _IIter1 __end1, _IIter2 __begin2, _IIter2 __end2) { typedef __gnu_parallel::_EqualTo< typename std::iterator_traits<_IIter1>::value_type, typename std::iterator_traits<_IIter2>::value_type> _EqualTo; return __equal_switch(__begin1, __end1, __begin2, __end2, _EqualTo(), std::__iterator_category(__begin1), std::__iterator_category(__begin2)); } template<typename _IIter1, typename _IIter2, typename _BinaryPredicate> inline bool equal(_IIter1 __begin1, _IIter1 __end1, _IIter2 __begin2, _IIter2 __end2, _BinaryPredicate __binary_pred) { return __equal_switch(__begin1, __end1, __begin2, __end2, __binary_pred, std::__iterator_category(__begin1), std::__iterator_category(__begin2)); } #endif // Sequential fallback template<typename _IIter1, typename _IIter2> inline bool lexicographical_compare(_IIter1 __begin1, _IIter1 __end1, _IIter2 __begin2, _IIter2 __end2, __gnu_parallel::sequential_tag) { return _GLIBCXX_STD_A::lexicographical_compare(__begin1, __end1, __begin2, __end2); } // Sequential fallback template<typename _IIter1, typename _IIter2, typename _Predicate> inline bool lexicographical_compare(_IIter1 __begin1, _IIter1 __end1, _IIter2 __begin2, _IIter2 __end2, _Predicate __pred, __gnu_parallel::sequential_tag) { return _GLIBCXX_STD_A::lexicographical_compare( __begin1, __end1, __begin2, __end2, __pred); } // Sequential fallback for input iterator case template<typename _IIter1, typename _IIter2, typename _Predicate, typename _IteratorTag1, typename _IteratorTag2> inline bool __lexicographical_compare_switch(_IIter1 __begin1, _IIter1 __end1, _IIter2 __begin2, _IIter2 __end2, _Predicate __pred, _IteratorTag1, _IteratorTag2) { return _GLIBCXX_STD_A::lexicographical_compare( __begin1, __end1, __begin2, __end2, __pred); } // Parallel lexicographical_compare for random access iterators // Limitation: Both valuetypes must be the same template<typename _RAIter1, typename _RAIter2, typename _Predicate> bool __lexicographical_compare_switch(_RAIter1 __begin1, _RAIter1 __end1, _RAIter2 __begin2, _RAIter2 __end2, _Predicate __pred, random_access_iterator_tag, random_access_iterator_tag) { if (_GLIBCXX_PARALLEL_CONDITION(true)) { typedef iterator_traits<_RAIter1> _TraitsType1; typedef typename _TraitsType1::value_type _ValueType1; typedef iterator_traits<_RAIter2> _TraitsType2; typedef typename _TraitsType2::value_type _ValueType2; typedef __gnu_parallel:: _EqualFromLess<_ValueType1, _ValueType2, _Predicate> _EqualFromLessCompare; // Longer sequence in first place. if ((__end1 - __begin1) < (__end2 - __begin2)) { typedef pair<_RAIter1, _RAIter2> _SpotType; _SpotType __mm = __mismatch_switch(__begin1, __end1, __begin2, _EqualFromLessCompare(__pred), random_access_iterator_tag(), random_access_iterator_tag()); return (__mm.first == __end1) || bool(__pred(*__mm.first, *__mm.second)); } else { typedef pair<_RAIter2, _RAIter1> _SpotType; _SpotType __mm = __mismatch_switch(__begin2, __end2, __begin1, _EqualFromLessCompare(__pred), random_access_iterator_tag(), random_access_iterator_tag()); return (__mm.first != __end2) && bool(__pred(*__mm.second, *__mm.first)); } } else return _GLIBCXX_STD_A::lexicographical_compare( __begin1, __end1, __begin2, __end2, __pred); } // Public interface template<typename _IIter1, typename _IIter2> inline bool lexicographical_compare(_IIter1 __begin1, _IIter1 __end1, _IIter2 __begin2, _IIter2 __end2) { typedef iterator_traits<_IIter1> _TraitsType1; typedef typename _TraitsType1::value_type _ValueType1; typedef typename _TraitsType1::iterator_category _IteratorCategory1; typedef iterator_traits<_IIter2> _TraitsType2; typedef typename _TraitsType2::value_type _ValueType2; typedef typename _TraitsType2::iterator_category _IteratorCategory2; typedef __gnu_parallel::_Less<_ValueType1, _ValueType2> _LessType; return __lexicographical_compare_switch( __begin1, __end1, __begin2, __end2, _LessType(), _IteratorCategory1(), _IteratorCategory2()); } // Public interface template<typename _IIter1, typename _IIter2, typename _Predicate> inline bool lexicographical_compare(_IIter1 __begin1, _IIter1 __end1, _IIter2 __begin2, _IIter2 __end2, _Predicate __pred) { typedef iterator_traits<_IIter1> _TraitsType1; typedef typename _TraitsType1::iterator_category _IteratorCategory1; typedef iterator_traits<_IIter2> _TraitsType2; typedef typename _TraitsType2::iterator_category _IteratorCategory2; return __lexicographical_compare_switch( __begin1, __end1, __begin2, __end2, __pred, _IteratorCategory1(), _IteratorCategory2()); } } // end namespace } // end namespace #endif /* _GLIBCXX_PARALLEL_ALGOBASE_H */
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