515 lines
20 KiB
C++
515 lines
20 KiB
C++
// -*- C++ -*-
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// Copyright (C) 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the terms
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// of the GNU General Public License as published by the Free Software
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// Foundation; either version 3, or (at your option) any later
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// version.
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// This library is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/**
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* @file parallel/numeric
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*
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* @brief Parallel STL function calls corresponding to stl_numeric.h.
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* The functions defined here mainly do case switches and
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* call the actual parallelized versions in other files.
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* Inlining policy: Functions that basically only contain one function call,
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* are declared inline.
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* This file is a GNU parallel extension to the Standard C++ Library.
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*/
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// Written by Johannes Singler and Felix Putze.
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#ifndef _GLIBCXX_PARALLEL_NUMERIC_H
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#define _GLIBCXX_PARALLEL_NUMERIC_H 1
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#include <numeric>
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#include <bits/stl_function.h>
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#include <parallel/numericfwd.h>
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#include <parallel/iterator.h>
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#include <parallel/for_each.h>
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#include <parallel/for_each_selectors.h>
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#include <parallel/partial_sum.h>
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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namespace __parallel
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{
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// Sequential fallback.
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template<typename _IIter, typename _Tp>
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inline _Tp
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accumulate(_IIter __begin, _IIter __end, _Tp __init,
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__gnu_parallel::sequential_tag)
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{ return _GLIBCXX_STD_A::accumulate(__begin, __end, __init); }
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template<typename _IIter, typename _Tp, typename _BinaryOperation>
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inline _Tp
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accumulate(_IIter __begin, _IIter __end, _Tp __init,
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_BinaryOperation __binary_op, __gnu_parallel::sequential_tag)
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{ return _GLIBCXX_STD_A::accumulate(__begin, __end, __init, __binary_op); }
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// Sequential fallback for input iterator case.
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template<typename _IIter, typename _Tp, typename _IteratorTag>
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inline _Tp
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__accumulate_switch(_IIter __begin, _IIter __end,
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_Tp __init, _IteratorTag)
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{ return accumulate(__begin, __end, __init,
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__gnu_parallel::sequential_tag()); }
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template<typename _IIter, typename _Tp, typename _BinaryOperation,
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typename _IteratorTag>
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inline _Tp
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__accumulate_switch(_IIter __begin, _IIter __end, _Tp __init,
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_BinaryOperation __binary_op, _IteratorTag)
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{ return accumulate(__begin, __end, __init, __binary_op,
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__gnu_parallel::sequential_tag()); }
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// Parallel algorithm for random access iterators.
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template<typename __RAIter, typename _Tp, typename _BinaryOperation>
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_Tp
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__accumulate_switch(__RAIter __begin, __RAIter __end,
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_Tp __init, _BinaryOperation __binary_op,
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random_access_iterator_tag,
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__gnu_parallel::_Parallelism __parallelism_tag
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= __gnu_parallel::parallel_unbalanced)
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{
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if (_GLIBCXX_PARALLEL_CONDITION(
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static_cast<__gnu_parallel::_SequenceIndex>(__end - __begin)
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>= __gnu_parallel::_Settings::get().accumulate_minimal_n
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&& __gnu_parallel::__is_parallel(__parallelism_tag)))
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{
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_Tp __res = __init;
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__gnu_parallel::__accumulate_selector<__RAIter>
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__my_selector;
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__gnu_parallel::
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__for_each_template_random_access_ed(__begin, __end,
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__gnu_parallel::_Nothing(),
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__my_selector,
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__gnu_parallel::
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__accumulate_binop_reduct
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<_BinaryOperation>(__binary_op),
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__res, __res, -1);
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return __res;
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}
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else
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return accumulate(__begin, __end, __init, __binary_op,
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__gnu_parallel::sequential_tag());
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}
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// Public interface.
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template<typename _IIter, typename _Tp>
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inline _Tp
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accumulate(_IIter __begin, _IIter __end, _Tp __init,
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__gnu_parallel::_Parallelism __parallelism_tag)
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{
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typedef std::iterator_traits<_IIter> _IteratorTraits;
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typedef typename _IteratorTraits::value_type _ValueType;
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typedef typename _IteratorTraits::iterator_category _IteratorCategory;
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return __accumulate_switch(__begin, __end, __init,
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__gnu_parallel::_Plus<_Tp, _ValueType>(),
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_IteratorCategory(), __parallelism_tag);
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}
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template<typename _IIter, typename _Tp>
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inline _Tp
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accumulate(_IIter __begin, _IIter __end, _Tp __init)
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{
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typedef std::iterator_traits<_IIter> _IteratorTraits;
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typedef typename _IteratorTraits::value_type _ValueType;
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typedef typename _IteratorTraits::iterator_category _IteratorCategory;
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return __accumulate_switch(__begin, __end, __init,
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__gnu_parallel::_Plus<_Tp, _ValueType>(),
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_IteratorCategory());
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}
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template<typename _IIter, typename _Tp, typename _BinaryOperation>
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inline _Tp
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accumulate(_IIter __begin, _IIter __end, _Tp __init,
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_BinaryOperation __binary_op,
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__gnu_parallel::_Parallelism __parallelism_tag)
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{
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typedef iterator_traits<_IIter> _IteratorTraits;
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typedef typename _IteratorTraits::iterator_category _IteratorCategory;
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return __accumulate_switch(__begin, __end, __init, __binary_op,
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_IteratorCategory(), __parallelism_tag);
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}
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template<typename _IIter, typename _Tp, typename _BinaryOperation>
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inline _Tp
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accumulate(_IIter __begin, _IIter __end, _Tp __init,
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_BinaryOperation __binary_op)
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{
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typedef iterator_traits<_IIter> _IteratorTraits;
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typedef typename _IteratorTraits::iterator_category _IteratorCategory;
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return __accumulate_switch(__begin, __end, __init, __binary_op,
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_IteratorCategory());
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}
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// Sequential fallback.
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template<typename _IIter1, typename _IIter2, typename _Tp>
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inline _Tp
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inner_product(_IIter1 __first1, _IIter1 __last1,
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_IIter2 __first2, _Tp __init,
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__gnu_parallel::sequential_tag)
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{ return _GLIBCXX_STD_A::inner_product(
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__first1, __last1, __first2, __init); }
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template<typename _IIter1, typename _IIter2, typename _Tp,
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typename _BinaryFunction1, typename _BinaryFunction2>
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inline _Tp
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inner_product(_IIter1 __first1, _IIter1 __last1,
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_IIter2 __first2, _Tp __init, _BinaryFunction1 __binary_op1,
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_BinaryFunction2 __binary_op2,
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__gnu_parallel::sequential_tag)
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{ return _GLIBCXX_STD_A::inner_product(__first1, __last1, __first2, __init,
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__binary_op1, __binary_op2); }
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// Parallel algorithm for random access iterators.
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template<typename _RAIter1, typename _RAIter2,
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typename _Tp, typename _BinaryFunction1, typename _BinaryFunction2>
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_Tp
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__inner_product_switch(_RAIter1 __first1,
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_RAIter1 __last1,
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_RAIter2 __first2, _Tp __init,
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_BinaryFunction1 __binary_op1,
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_BinaryFunction2 __binary_op2,
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random_access_iterator_tag,
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random_access_iterator_tag,
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__gnu_parallel::_Parallelism __parallelism_tag
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= __gnu_parallel::parallel_unbalanced)
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{
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if (_GLIBCXX_PARALLEL_CONDITION((__last1 - __first1)
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>= __gnu_parallel::_Settings::get().
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accumulate_minimal_n
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&& __gnu_parallel::
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__is_parallel(__parallelism_tag)))
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{
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_Tp __res = __init;
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__gnu_parallel::
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__inner_product_selector<_RAIter1,
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_RAIter2, _Tp> __my_selector(__first1, __first2);
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__gnu_parallel::
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__for_each_template_random_access_ed(
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__first1, __last1, __binary_op2, __my_selector, __binary_op1,
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__res, __res, -1);
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return __res;
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}
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else
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return inner_product(__first1, __last1, __first2, __init,
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__gnu_parallel::sequential_tag());
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}
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// No parallelism for input iterators.
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template<typename _IIter1, typename _IIter2, typename _Tp,
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typename _BinaryFunction1, typename _BinaryFunction2,
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typename _IteratorTag1, typename _IteratorTag2>
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inline _Tp
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__inner_product_switch(_IIter1 __first1, _IIter1 __last1,
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_IIter2 __first2, _Tp __init,
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_BinaryFunction1 __binary_op1,
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_BinaryFunction2 __binary_op2,
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_IteratorTag1, _IteratorTag2)
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{ return inner_product(__first1, __last1, __first2, __init, __binary_op1,
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__binary_op2, __gnu_parallel::sequential_tag()); }
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template<typename _IIter1, typename _IIter2, typename _Tp,
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typename _BinaryFunction1, typename _BinaryFunction2>
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inline _Tp
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inner_product(_IIter1 __first1, _IIter1 __last1,
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_IIter2 __first2, _Tp __init, _BinaryFunction1 __binary_op1,
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_BinaryFunction2 __binary_op2,
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__gnu_parallel::_Parallelism __parallelism_tag)
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{
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typedef iterator_traits<_IIter1> _TraitsType1;
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typedef typename _TraitsType1::iterator_category _IteratorCategory1;
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typedef iterator_traits<_IIter2> _TraitsType2;
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typedef typename _TraitsType2::iterator_category _IteratorCategory2;
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return __inner_product_switch(__first1, __last1, __first2, __init,
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__binary_op1, __binary_op2,
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_IteratorCategory1(), _IteratorCategory2(),
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__parallelism_tag);
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}
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template<typename _IIter1, typename _IIter2, typename _Tp,
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typename _BinaryFunction1, typename _BinaryFunction2>
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inline _Tp
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inner_product(_IIter1 __first1, _IIter1 __last1,
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_IIter2 __first2, _Tp __init, _BinaryFunction1 __binary_op1,
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_BinaryFunction2 __binary_op2)
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{
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typedef iterator_traits<_IIter1> _TraitsType1;
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typedef typename _TraitsType1::iterator_category _IteratorCategory1;
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typedef iterator_traits<_IIter2> _TraitsType2;
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typedef typename _TraitsType2::iterator_category _IteratorCategory2;
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return __inner_product_switch(__first1, __last1, __first2, __init,
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__binary_op1, __binary_op2,
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_IteratorCategory1(),
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_IteratorCategory2());
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}
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template<typename _IIter1, typename _IIter2, typename _Tp>
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inline _Tp
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inner_product(_IIter1 __first1, _IIter1 __last1,
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_IIter2 __first2, _Tp __init,
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__gnu_parallel::_Parallelism __parallelism_tag)
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{
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typedef iterator_traits<_IIter1> _TraitsType1;
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typedef typename _TraitsType1::value_type _ValueType1;
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typedef iterator_traits<_IIter2> _TraitsType2;
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typedef typename _TraitsType2::value_type _ValueType2;
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typedef typename
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__gnu_parallel::_Multiplies<_ValueType1, _ValueType2>::result_type
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_MultipliesResultType;
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return __gnu_parallel::inner_product(__first1, __last1, __first2, __init,
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__gnu_parallel::_Plus<_Tp, _MultipliesResultType>(),
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__gnu_parallel::
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_Multiplies<_ValueType1, _ValueType2>(),
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__parallelism_tag);
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}
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template<typename _IIter1, typename _IIter2, typename _Tp>
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inline _Tp
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inner_product(_IIter1 __first1, _IIter1 __last1,
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_IIter2 __first2, _Tp __init)
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{
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typedef iterator_traits<_IIter1> _TraitsType1;
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typedef typename _TraitsType1::value_type _ValueType1;
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typedef iterator_traits<_IIter2> _TraitsType2;
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typedef typename _TraitsType2::value_type _ValueType2;
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typedef typename
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__gnu_parallel::_Multiplies<_ValueType1, _ValueType2>::result_type
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_MultipliesResultType;
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return __gnu_parallel::inner_product(__first1, __last1, __first2, __init,
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__gnu_parallel::_Plus<_Tp, _MultipliesResultType>(),
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__gnu_parallel::
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_Multiplies<_ValueType1, _ValueType2>());
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}
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// Sequential fallback.
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template<typename _IIter, typename _OutputIterator>
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inline _OutputIterator
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partial_sum(_IIter __begin, _IIter __end, _OutputIterator __result,
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__gnu_parallel::sequential_tag)
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{ return _GLIBCXX_STD_A::partial_sum(__begin, __end, __result); }
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// Sequential fallback.
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template<typename _IIter, typename _OutputIterator,
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typename _BinaryOperation>
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inline _OutputIterator
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partial_sum(_IIter __begin, _IIter __end, _OutputIterator __result,
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_BinaryOperation __bin_op, __gnu_parallel::sequential_tag)
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{ return _GLIBCXX_STD_A::partial_sum(__begin, __end, __result, __bin_op); }
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// Sequential fallback for input iterator case.
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template<typename _IIter, typename _OutputIterator,
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typename _BinaryOperation, typename _IteratorTag1,
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typename _IteratorTag2>
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inline _OutputIterator
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__partial_sum_switch(_IIter __begin, _IIter __end,
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_OutputIterator __result, _BinaryOperation __bin_op,
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_IteratorTag1, _IteratorTag2)
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{ return _GLIBCXX_STD_A::partial_sum(__begin, __end, __result, __bin_op); }
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// Parallel algorithm for random access iterators.
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template<typename _IIter, typename _OutputIterator,
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typename _BinaryOperation>
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_OutputIterator
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__partial_sum_switch(_IIter __begin, _IIter __end,
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_OutputIterator __result, _BinaryOperation __bin_op,
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random_access_iterator_tag,
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random_access_iterator_tag)
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{
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if (_GLIBCXX_PARALLEL_CONDITION(
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static_cast<__gnu_parallel::_SequenceIndex>(__end - __begin)
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>= __gnu_parallel::_Settings::get().partial_sum_minimal_n))
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return __gnu_parallel::__parallel_partial_sum(__begin, __end,
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__result, __bin_op);
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else
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return partial_sum(__begin, __end, __result, __bin_op,
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__gnu_parallel::sequential_tag());
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}
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// Public interface.
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template<typename _IIter, typename _OutputIterator>
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inline _OutputIterator
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partial_sum(_IIter __begin, _IIter __end, _OutputIterator __result)
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{
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typedef typename iterator_traits<_IIter>::value_type _ValueType;
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return __gnu_parallel::partial_sum(__begin, __end,
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__result, std::plus<_ValueType>());
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}
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// Public interface
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template<typename _IIter, typename _OutputIterator,
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typename _BinaryOperation>
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inline _OutputIterator
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partial_sum(_IIter __begin, _IIter __end, _OutputIterator __result,
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_BinaryOperation __binary_op)
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{
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typedef iterator_traits<_IIter> _ITraitsType;
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typedef typename _ITraitsType::iterator_category _IIteratorCategory;
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typedef iterator_traits<_OutputIterator> _OTraitsType;
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typedef typename _OTraitsType::iterator_category _OIterCategory;
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return __partial_sum_switch(__begin, __end, __result, __binary_op,
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_IIteratorCategory(), _OIterCategory());
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}
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// Sequential fallback.
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template<typename _IIter, typename _OutputIterator>
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inline _OutputIterator
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adjacent_difference(_IIter __begin, _IIter __end, _OutputIterator __result,
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__gnu_parallel::sequential_tag)
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{ return _GLIBCXX_STD_A::adjacent_difference(__begin, __end, __result); }
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// Sequential fallback.
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template<typename _IIter, typename _OutputIterator,
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typename _BinaryOperation>
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inline _OutputIterator
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adjacent_difference(_IIter __begin, _IIter __end,
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_OutputIterator __result, _BinaryOperation __bin_op,
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__gnu_parallel::sequential_tag)
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{ return _GLIBCXX_STD_A::adjacent_difference(__begin, __end,
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__result, __bin_op); }
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// Sequential fallback for input iterator case.
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template<typename _IIter, typename _OutputIterator,
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typename _BinaryOperation, typename _IteratorTag1,
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typename _IteratorTag2>
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inline _OutputIterator
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__adjacent_difference_switch(_IIter __begin, _IIter __end,
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_OutputIterator __result,
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_BinaryOperation __bin_op, _IteratorTag1,
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_IteratorTag2)
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{ return adjacent_difference(__begin, __end, __result, __bin_op,
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__gnu_parallel::sequential_tag()); }
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// Parallel algorithm for random access iterators.
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template<typename _IIter, typename _OutputIterator,
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typename _BinaryOperation>
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_OutputIterator
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__adjacent_difference_switch(_IIter __begin, _IIter __end,
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_OutputIterator __result,
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_BinaryOperation __bin_op,
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random_access_iterator_tag,
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random_access_iterator_tag,
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__gnu_parallel::_Parallelism
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__parallelism_tag
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= __gnu_parallel::parallel_balanced)
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{
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if (_GLIBCXX_PARALLEL_CONDITION(
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static_cast<__gnu_parallel::_SequenceIndex>(__end - __begin)
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>= __gnu_parallel::_Settings::get().adjacent_difference_minimal_n
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&& __gnu_parallel::__is_parallel(__parallelism_tag)))
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{
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bool __dummy = true;
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typedef __gnu_parallel::_IteratorPair<_IIter, _OutputIterator,
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random_access_iterator_tag> _ItTrip;
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*__result = *__begin;
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_ItTrip __begin_pair(__begin + 1, __result + 1),
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__end_pair(__end, __result + (__end - __begin));
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__gnu_parallel::__adjacent_difference_selector<_ItTrip>
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__functionality;
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__gnu_parallel::
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__for_each_template_random_access_ed(
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__begin_pair, __end_pair, __bin_op, __functionality,
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__gnu_parallel::_DummyReduct(), __dummy, __dummy, -1);
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return __functionality._M_finish_iterator;
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}
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else
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return adjacent_difference(__begin, __end, __result, __bin_op,
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__gnu_parallel::sequential_tag());
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}
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// Public interface.
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template<typename _IIter, typename _OutputIterator>
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inline _OutputIterator
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adjacent_difference(_IIter __begin, _IIter __end,
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_OutputIterator __result,
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__gnu_parallel::_Parallelism __parallelism_tag)
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{
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typedef iterator_traits<_IIter> _TraitsType;
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typedef typename _TraitsType::value_type _ValueType;
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return adjacent_difference(__begin, __end, __result,
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std::minus<_ValueType>(),
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__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 */
|