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// -*- C++ -*-
// Copyright (C) 2007-2023 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 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 */
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