Edit: numeric
// -*- 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/numeric * * @brief Parallel STL function calls corresponding to stl_numeric.h. * 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_NUMERIC_H #define _GLIBCXX_PARALLEL_NUMERIC_H 1 #include <numeric> #include <bits/stl_function.h> #include <parallel/numericfwd.h> #include <parallel/iterator.h> #include <parallel/for_each.h> #include <parallel/for_each_selectors.h> #include <parallel/partial_sum.h> namespace std _GLIBCXX_VISIBILITY(default) { namespace __parallel { // Sequential fallback. template<typename _IIter, typename _Tp> inline _Tp accumulate(_IIter __begin, _IIter __end, _Tp __init, __gnu_parallel::sequential_tag) { return _GLIBCXX_STD_A::accumulate(__begin, __end, __init); } template<typename _IIter, typename _Tp, typename _BinaryOperation> inline _Tp accumulate(_IIter __begin, _IIter __end, _Tp __init, _BinaryOperation __binary_op, __gnu_parallel::sequential_tag) { return _GLIBCXX_STD_A::accumulate(__begin, __end, __init, __binary_op); } // Sequential fallback for input iterator case. template<typename _IIter, typename _Tp, typename _IteratorTag> inline _Tp __accumulate_switch(_IIter __begin, _IIter __end, _Tp __init, _IteratorTag) { return accumulate(__begin, __end, __init, __gnu_parallel::sequential_tag()); } template<typename _IIter, typename _Tp, typename _BinaryOperation, typename _IteratorTag> inline _Tp __accumulate_switch(_IIter __begin, _IIter __end, _Tp __init, _BinaryOperation __binary_op, _IteratorTag) { return accumulate(__begin, __end, __init, __binary_op, __gnu_parallel::sequential_tag()); } // Parallel algorithm for random access iterators. template<typename __RAIter, typename _Tp, typename _BinaryOperation> _Tp __accumulate_switch(__RAIter __begin, __RAIter __end, _Tp __init, _BinaryOperation __binary_op, random_access_iterator_tag, __gnu_parallel::_Parallelism __parallelism_tag) { if (_GLIBCXX_PARALLEL_CONDITION( static_cast<__gnu_parallel::_SequenceIndex>(__end - __begin) >= __gnu_parallel::_Settings::get().accumulate_minimal_n && __gnu_parallel::__is_parallel(__parallelism_tag))) { _Tp __res = __init; __gnu_parallel::__accumulate_selector<__RAIter> __my_selector; __gnu_parallel:: __for_each_template_random_access_ed(__begin, __end, __gnu_parallel::_Nothing(), __my_selector, __gnu_parallel:: __accumulate_binop_reduct <_BinaryOperation>(__binary_op), __res, __res, -1); return __res; } else return accumulate(__begin, __end, __init, __binary_op, __gnu_parallel::sequential_tag()); } // Public interface. template<typename _IIter, typename _Tp> inline _Tp accumulate(_IIter __begin, _IIter __end, _Tp __init, __gnu_parallel::_Parallelism __parallelism_tag) { typedef std::iterator_traits<_IIter> _IteratorTraits; typedef typename _IteratorTraits::value_type _ValueType; typedef typename _IteratorTraits::iterator_category _IteratorCategory; return __accumulate_switch(__begin, __end, __init, __gnu_parallel::_Plus<_Tp, _ValueType>(), _IteratorCategory(), __parallelism_tag); } template<typename _IIter, typename _Tp> inline _Tp accumulate(_IIter __begin, _IIter __end, _Tp __init) { typedef std::iterator_traits<_IIter> _IteratorTraits; typedef typename _IteratorTraits::value_type _ValueType; typedef typename _IteratorTraits::iterator_category _IteratorCategory; return __accumulate_switch(__begin, __end, __init, __gnu_parallel::_Plus<_Tp, _ValueType>(), _IteratorCategory()); } template<typename _IIter, typename _Tp, typename _BinaryOperation> inline _Tp accumulate(_IIter __begin, _IIter __end, _Tp __init, _BinaryOperation __binary_op, __gnu_parallel::_Parallelism __parallelism_tag) { typedef iterator_traits<_IIter> _IteratorTraits; typedef typename _IteratorTraits::iterator_category _IteratorCategory; return __accumulate_switch(__begin, __end, __init, __binary_op, _IteratorCategory(), __parallelism_tag); } template<typename _IIter, typename _Tp, typename _BinaryOperation> inline _Tp accumulate(_IIter __begin, _IIter __end, _Tp __init, _BinaryOperation __binary_op) { typedef iterator_traits<_IIter> _IteratorTraits; typedef typename _IteratorTraits::iterator_category _IteratorCategory; return __accumulate_switch(__begin, __end, __init, __binary_op, _IteratorCategory()); } // Sequential fallback. template<typename _IIter1, typename _IIter2, typename _Tp> inline _Tp inner_product(_IIter1 __first1, _IIter1 __last1, _IIter2 __first2, _Tp __init, __gnu_parallel::sequential_tag) { return _GLIBCXX_STD_A::inner_product( __first1, __last1, __first2, __init); } template<typename _IIter1, typename _IIter2, typename _Tp, typename _BinaryFunction1, typename _BinaryFunction2> inline _Tp inner_product(_IIter1 __first1, _IIter1 __last1, _IIter2 __first2, _Tp __init, _BinaryFunction1 __binary_op1, _BinaryFunction2 __binary_op2, __gnu_parallel::sequential_tag) { return _GLIBCXX_STD_A::inner_product(__first1, __last1, __first2, __init, __binary_op1, __binary_op2); } // Parallel algorithm for random access iterators. template<typename _RAIter1, typename _RAIter2, typename _Tp, typename _BinaryFunction1, typename _BinaryFunction2> _Tp __inner_product_switch(_RAIter1 __first1, _RAIter1 __last1, _RAIter2 __first2, _Tp __init, _BinaryFunction1 __binary_op1, _BinaryFunction2 __binary_op2, random_access_iterator_tag, random_access_iterator_tag, __gnu_parallel::_Parallelism __parallelism_tag) { if (_GLIBCXX_PARALLEL_CONDITION((__last1 - __first1) >= __gnu_parallel::_Settings::get(). accumulate_minimal_n && __gnu_parallel:: __is_parallel(__parallelism_tag))) { _Tp __res = __init; __gnu_parallel:: __inner_product_selector<_RAIter1, _RAIter2, _Tp> __my_selector(__first1, __first2); __gnu_parallel:: __for_each_template_random_access_ed( __first1, __last1, __binary_op2, __my_selector, __binary_op1, __res, __res, -1); return __res; } else return inner_product(__first1, __last1, __first2, __init, __gnu_parallel::sequential_tag()); } // No parallelism for input iterators. template<typename _IIter1, typename _IIter2, typename _Tp, typename _BinaryFunction1, typename _BinaryFunction2, typename _IteratorTag1, typename _IteratorTag2> inline _Tp __inner_product_switch(_IIter1 __first1, _IIter1 __last1, _IIter2 __first2, _Tp __init, _BinaryFunction1 __binary_op1, _BinaryFunction2 __binary_op2, _IteratorTag1, _IteratorTag2) { return inner_product(__first1, __last1, __first2, __init, __binary_op1, __binary_op2, __gnu_parallel::sequential_tag()); } template<typename _IIter1, typename _IIter2, typename _Tp, typename _BinaryFunction1, typename _BinaryFunction2> inline _Tp inner_product(_IIter1 __first1, _IIter1 __last1, _IIter2 __first2, _Tp __init, _BinaryFunction1 __binary_op1, _BinaryFunction2 __binary_op2, __gnu_parallel::_Parallelism __parallelism_tag) { typedef iterator_traits<_IIter1> _TraitsType1; typedef typename _TraitsType1::iterator_category _IteratorCategory1; typedef iterator_traits<_IIter2> _TraitsType2; typedef typename _TraitsType2::iterator_category _IteratorCategory2; return __inner_product_switch(__first1, __last1, __first2, __init, __binary_op1, __binary_op2, _IteratorCategory1(), _IteratorCategory2(), __parallelism_tag); } template<typename _IIter1, typename _IIter2, typename _Tp, typename _BinaryFunction1, typename _BinaryFunction2> inline _Tp inner_product(_IIter1 __first1, _IIter1 __last1, _IIter2 __first2, _Tp __init, _BinaryFunction1 __binary_op1, _BinaryFunction2 __binary_op2) { typedef iterator_traits<_IIter1> _TraitsType1; typedef typename _TraitsType1::iterator_category _IteratorCategory1; typedef iterator_traits<_IIter2> _TraitsType2; typedef typename _TraitsType2::iterator_category _IteratorCategory2; return __inner_product_switch(__first1, __last1, __first2, __init, __binary_op1, __binary_op2, _IteratorCategory1(), _IteratorCategory2()); } template<typename _IIter1, typename _IIter2, typename _Tp> inline _Tp inner_product(_IIter1 __first1, _IIter1 __last1, _IIter2 __first2, _Tp __init, __gnu_parallel::_Parallelism __parallelism_tag) { typedef iterator_traits<_IIter1> _TraitsType1; typedef typename _TraitsType1::value_type _ValueType1; typedef iterator_traits<_IIter2> _TraitsType2; typedef typename _TraitsType2::value_type _ValueType2; typedef typename __gnu_parallel::_Multiplies<_ValueType1, _ValueType2>::result_type _MultipliesResultType; return __gnu_parallel::inner_product(__first1, __last1, __first2, __init, __gnu_parallel::_Plus<_Tp, _MultipliesResultType>(), __gnu_parallel:: _Multiplies<_ValueType1, _ValueType2>(), __parallelism_tag); } template<typename _IIter1, typename _IIter2, typename _Tp> inline _Tp inner_product(_IIter1 __first1, _IIter1 __last1, _IIter2 __first2, _Tp __init) { typedef iterator_traits<_IIter1> _TraitsType1; typedef typename _TraitsType1::value_type _ValueType1; typedef iterator_traits<_IIter2> _TraitsType2; typedef typename _TraitsType2::value_type _ValueType2; typedef typename __gnu_parallel::_Multiplies<_ValueType1, _ValueType2>::result_type _MultipliesResultType; return __gnu_parallel::inner_product(__first1, __last1, __first2, __init, __gnu_parallel::_Plus<_Tp, _MultipliesResultType>(), __gnu_parallel:: _Multiplies<_ValueType1, _ValueType2>()); } // Sequential fallback. template<typename _IIter, typename _OutputIterator> inline _OutputIterator partial_sum(_IIter __begin, _IIter __end, _OutputIterator __result, __gnu_parallel::sequential_tag) { return _GLIBCXX_STD_A::partial_sum(__begin, __end, __result); } // Sequential fallback. template<typename _IIter, typename _OutputIterator, typename _BinaryOperation> inline _OutputIterator partial_sum(_IIter __begin, _IIter __end, _OutputIterator __result, _BinaryOperation __bin_op, __gnu_parallel::sequential_tag) { return _GLIBCXX_STD_A::partial_sum(__begin, __end, __result, __bin_op); } // Sequential fallback for input iterator case. template<typename _IIter, typename _OutputIterator, typename _BinaryOperation, typename _IteratorTag1, typename _IteratorTag2> inline _OutputIterator __partial_sum_switch(_IIter __begin, _IIter __end, _OutputIterator __result, _BinaryOperation __bin_op, _IteratorTag1, _IteratorTag2) { return _GLIBCXX_STD_A::partial_sum(__begin, __end, __result, __bin_op); } // Parallel algorithm for random access iterators. template<typename _IIter, typename _OutputIterator, typename _BinaryOperation> _OutputIterator __partial_sum_switch(_IIter __begin, _IIter __end, _OutputIterator __result, _BinaryOperation __bin_op, random_access_iterator_tag, random_access_iterator_tag) { if (_GLIBCXX_PARALLEL_CONDITION( static_cast<__gnu_parallel::_SequenceIndex>(__end - __begin) >= __gnu_parallel::_Settings::get().partial_sum_minimal_n)) return __gnu_parallel::__parallel_partial_sum(__begin, __end, __result, __bin_op); else return partial_sum(__begin, __end, __result, __bin_op, __gnu_parallel::sequential_tag()); } // Public interface. template<typename _IIter, typename _OutputIterator> inline _OutputIterator partial_sum(_IIter __begin, _IIter __end, _OutputIterator __result) { typedef typename iterator_traits<_IIter>::value_type _ValueType; return __gnu_parallel::partial_sum(__begin, __end, __result, std::plus<_ValueType>()); } // Public interface template<typename _IIter, typename _OutputIterator, typename _BinaryOperation> inline _OutputIterator partial_sum(_IIter __begin, _IIter __end, _OutputIterator __result, _BinaryOperation __binary_op) { typedef iterator_traits<_IIter> _ITraitsType; typedef typename _ITraitsType::iterator_category _IIteratorCategory; typedef iterator_traits<_OutputIterator> _OTraitsType; typedef typename _OTraitsType::iterator_category _OIterCategory; return __partial_sum_switch(__begin, __end, __result, __binary_op, _IIteratorCategory(), _OIterCategory()); } // Sequential fallback. template<typename _IIter, typename _OutputIterator> inline _OutputIterator adjacent_difference(_IIter __begin, _IIter __end, _OutputIterator __result, __gnu_parallel::sequential_tag) { return _GLIBCXX_STD_A::adjacent_difference(__begin, __end, __result); } // Sequential fallback. template<typename _IIter, typename _OutputIterator, typename _BinaryOperation> inline _OutputIterator adjacent_difference(_IIter __begin, _IIter __end, _OutputIterator __result, _BinaryOperation __bin_op, __gnu_parallel::sequential_tag) { return _GLIBCXX_STD_A::adjacent_difference(__begin, __end, __result, __bin_op); } // Sequential fallback for input iterator case. template<typename _IIter, typename _OutputIterator, typename _BinaryOperation, typename _IteratorTag1, typename _IteratorTag2> inline _OutputIterator __adjacent_difference_switch(_IIter __begin, _IIter __end, _OutputIterator __result, _BinaryOperation __bin_op, _IteratorTag1, _IteratorTag2) { return adjacent_difference(__begin, __end, __result, __bin_op, __gnu_parallel::sequential_tag()); } // Parallel algorithm for random access iterators. template<typename _IIter, typename _OutputIterator, typename _BinaryOperation> _OutputIterator __adjacent_difference_switch(_IIter __begin, _IIter __end, _OutputIterator __result, _BinaryOperation __bin_op, random_access_iterator_tag, random_access_iterator_tag, __gnu_parallel::_Parallelism __parallelism_tag) { if (_GLIBCXX_PARALLEL_CONDITION( static_cast<__gnu_parallel::_SequenceIndex>(__end - __begin) >= __gnu_parallel::_Settings::get().adjacent_difference_minimal_n && __gnu_parallel::__is_parallel(__parallelism_tag))) { bool __dummy = true; typedef __gnu_parallel::_IteratorPair<_IIter, _OutputIterator, random_access_iterator_tag> _ItTrip; *__result = *__begin; _ItTrip __begin_pair(__begin + 1, __result + 1), __end_pair(__end, __result + (__end - __begin)); __gnu_parallel::__adjacent_difference_selector<_ItTrip> __functionality; __gnu_parallel:: __for_each_template_random_access_ed( __begin_pair, __end_pair, __bin_op, __functionality, __gnu_parallel::_DummyReduct(), __dummy, __dummy, -1); return __functionality._M_finish_iterator; } else return adjacent_difference(__begin, __end, __result, __bin_op, __gnu_parallel::sequential_tag()); } // Public interface. template<typename _IIter, typename _OutputIterator> inline _OutputIterator adjacent_difference(_IIter __begin, _IIter __end, _OutputIterator __result, __gnu_parallel::_Parallelism __parallelism_tag) { typedef iterator_traits<_IIter> _TraitsType; typedef typename _TraitsType::value_type _ValueType; return adjacent_difference(__begin, __end, __result, std::minus<_ValueType>(), __parallelism_tag); } template<typename _IIter, typename _OutputIterator> inline _OutputIterator adjacent_difference(_IIter __begin, _IIter __end, _OutputIterator __result) { typedef iterator_traits<_IIter> _TraitsType; typedef typename _TraitsType::value_type _ValueType; return adjacent_difference(__begin, __end, __result, std::minus<_ValueType>()); } template<typename _IIter, typename _OutputIterator, typename _BinaryOperation> inline _OutputIterator adjacent_difference(_IIter __begin, _IIter __end, _OutputIterator __result, _BinaryOperation __binary_op, __gnu_parallel::_Parallelism __parallelism_tag) { typedef iterator_traits<_IIter> _ITraitsType; typedef typename _ITraitsType::iterator_category _IIteratorCategory; typedef iterator_traits<_OutputIterator> _OTraitsType; typedef typename _OTraitsType::iterator_category _OIterCategory; return __adjacent_difference_switch(__begin, __end, __result, __binary_op, _IIteratorCategory(), _OIterCategory(), __parallelism_tag); } template<typename _IIter, typename _OutputIterator, typename _BinaryOperation> inline _OutputIterator adjacent_difference(_IIter __begin, _IIter __end, _OutputIterator __result, _BinaryOperation __binary_op) { typedef iterator_traits<_IIter> _ITraitsType; typedef typename _ITraitsType::iterator_category _IIteratorCategory; typedef iterator_traits<_OutputIterator> _OTraitsType; typedef typename _OTraitsType::iterator_category _OIterCategory; return __adjacent_difference_switch(__begin, __end, __result, __binary_op, _IIteratorCategory(), _OIterCategory()); } } // end namespace } // end namespace #endif /* _GLIBCXX_NUMERIC_H */
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