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// -*- C++ -*- // Copyright (C) 2007-2013 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/find_selectors.h * @brief _Function objects representing different tasks to be plugged * into the parallel find algorithm. * This file is a GNU parallel extension to the Standard C++ Library. */ // Written by Felix Putze. #ifndef _GLIBCXX_PARALLEL_FIND_SELECTORS_H #define _GLIBCXX_PARALLEL_FIND_SELECTORS_H 1 #include <parallel/tags.h> #include <parallel/basic_iterator.h> #include <bits/stl_pair.h> namespace __gnu_parallel { /** @brief Base class of all __gnu_parallel::__find_template selectors. */ struct __generic_find_selector { }; /** * @brief Test predicate on a single element, used for std::find() * and std::find_if (). */ struct __find_if_selector : public __generic_find_selector { /** @brief Test on one position. * @param __i1 _Iterator on first sequence. * @param __i2 _Iterator on second sequence (unused). * @param __pred Find predicate. */ template<typename _RAIter1, typename _RAIter2, typename _Pred> bool operator()(_RAIter1 __i1, _RAIter2 __i2, _Pred __pred) { return __pred(*__i1); } /** @brief Corresponding sequential algorithm on a sequence. * @param __begin1 Begin iterator of first sequence. * @param __end1 End iterator of first sequence. * @param __begin2 Begin iterator of second sequence. * @param __pred Find predicate. */ template<typename _RAIter1, typename _RAIter2, typename _Pred> std::pair<_RAIter1, _RAIter2> _M_sequential_algorithm(_RAIter1 __begin1, _RAIter1 __end1, _RAIter2 __begin2, _Pred __pred) { return std::make_pair(find_if(__begin1, __end1, __pred, sequential_tag()), __begin2); } }; /** @brief Test predicate on two adjacent elements. */ struct __adjacent_find_selector : public __generic_find_selector { /** @brief Test on one position. * @param __i1 _Iterator on first sequence. * @param __i2 _Iterator on second sequence (unused). * @param __pred Find predicate. */ template<typename _RAIter1, typename _RAIter2, typename _Pred> bool operator()(_RAIter1 __i1, _RAIter2 __i2, _Pred __pred) { // Passed end iterator is one short. return __pred(*__i1, *(__i1 + 1)); } /** @brief Corresponding sequential algorithm on a sequence. * @param __begin1 Begin iterator of first sequence. * @param __end1 End iterator of first sequence. * @param __begin2 Begin iterator of second sequence. * @param __pred Find predicate. */ template<typename _RAIter1, typename _RAIter2, typename _Pred> std::pair<_RAIter1, _RAIter2> _M_sequential_algorithm(_RAIter1 __begin1, _RAIter1 __end1, _RAIter2 __begin2, _Pred __pred) { // Passed end iterator is one short. _RAIter1 __spot = adjacent_find(__begin1, __end1 + 1, __pred, sequential_tag()); if (__spot == (__end1 + 1)) __spot = __end1; return std::make_pair(__spot, __begin2); } }; /** @brief Test inverted predicate on a single element. */ struct __mismatch_selector : public __generic_find_selector { /** * @brief Test on one position. * @param __i1 _Iterator on first sequence. * @param __i2 _Iterator on second sequence (unused). * @param __pred Find predicate. */ template<typename _RAIter1, typename _RAIter2, typename _Pred> bool operator()(_RAIter1 __i1, _RAIter2 __i2, _Pred __pred) { return !__pred(*__i1, *__i2); } /** * @brief Corresponding sequential algorithm on a sequence. * @param __begin1 Begin iterator of first sequence. * @param __end1 End iterator of first sequence. * @param __begin2 Begin iterator of second sequence. * @param __pred Find predicate. */ template<typename _RAIter1, typename _RAIter2, typename _Pred> std::pair<_RAIter1, _RAIter2> _M_sequential_algorithm(_RAIter1 __begin1, _RAIter1 __end1, _RAIter2 __begin2, _Pred __pred) { return mismatch(__begin1, __end1, __begin2, __pred, sequential_tag()); } }; /** @brief Test predicate on several elements. */ template<typename _FIterator> struct __find_first_of_selector : public __generic_find_selector { _FIterator _M_begin; _FIterator _M_end; explicit __find_first_of_selector(_FIterator __begin, _FIterator __end) : _M_begin(__begin), _M_end(__end) { } /** @brief Test on one position. * @param __i1 _Iterator on first sequence. * @param __i2 _Iterator on second sequence (unused). * @param __pred Find predicate. */ template<typename _RAIter1, typename _RAIter2, typename _Pred> bool operator()(_RAIter1 __i1, _RAIter2 __i2, _Pred __pred) { for (_FIterator __pos_in_candidates = _M_begin; __pos_in_candidates != _M_end; ++__pos_in_candidates) if (__pred(*__i1, *__pos_in_candidates)) return true; return false; } /** @brief Corresponding sequential algorithm on a sequence. * @param __begin1 Begin iterator of first sequence. * @param __end1 End iterator of first sequence. * @param __begin2 Begin iterator of second sequence. * @param __pred Find predicate. */ template<typename _RAIter1, typename _RAIter2, typename _Pred> std::pair<_RAIter1, _RAIter2> _M_sequential_algorithm(_RAIter1 __begin1, _RAIter1 __end1, _RAIter2 __begin2, _Pred __pred) { return std::make_pair(find_first_of(__begin1, __end1, _M_begin, _M_end, __pred, sequential_tag()), __begin2); } }; } #endif /* _GLIBCXX_PARALLEL_FIND_SELECTORS_H */