forked from boostorg/algorithm
64 lines
2.5 KiB
C++
64 lines
2.5 KiB
C++
/*
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Copyright (c) Alexander Zaitsev <zamazan4ik@gmail.by>, 2017.
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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*/
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/// \file is_partitioned_until.hpp
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/// \brief Tell if a sequence is partitioned
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/// \author Alexander Zaitsev
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#ifndef BOOST_ALGORITHM_IS_PARTITIONED_UNTIL_HPP
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#define BOOST_ALGORITHM_IS_PARTITIONED_UNTIL_HPP
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#include <boost/range/begin.hpp>
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#include <boost/range/end.hpp>
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namespace boost { namespace algorithm {
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/// \fn is_partitioned_until ( InputIterator first, InputIterator last, UnaryPredicate p )
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/// \brief Tests to see if a sequence is partitioned according to a predicate.
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/// In other words, all the items in the sequence that satisfy the predicate are at the beginning of the sequence.
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///
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/// \param first The start of the input sequence
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/// \param last One past the end of the input sequence
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/// \param p The predicate to test the values with
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///
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/// \note Returns the first iterator 'it' in the sequence [first, last) for which is_partitioned(first, it, p) is false.
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/// Returns last if the entire sequence is partitioned.
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/// Complexity: O(N).
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template <typename InputIterator, typename UnaryPredicate>
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InputIterator is_partitioned_until ( InputIterator first, InputIterator last, UnaryPredicate p )
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{
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// Run through the part that satisfy the predicate
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for ( ; first != last; ++first )
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if ( !p (*first))
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break;
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// Now the part that does not satisfy the predicate
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for ( ; first != last; ++first )
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if ( p (*first))
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return first;
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return last;
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}
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/// \fn is_partitioned_until ( const Range &r, UnaryPredicate p )
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/// \brief Tests to see if a sequence is partitioned according to a predicate.
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/// In other words, all the items in the sequence that satisfy the predicate are at the beginning of the sequence.
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///
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/// \param r The input range
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/// \param p The predicate to test the values with
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///
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/// \note Returns the first iterator 'it' in the sequence [first, last) for which is_partitioned(first, it, p) is false.
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/// Returns last if the entire sequence is partitioned.
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/// Complexity: O(N).
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template <typename Range, typename UnaryPredicate>
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typename boost::range_iterator<const Range>::type is_partitioned_until ( const Range &r, UnaryPredicate p )
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{
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return boost::algorithm::is_partitioned_until (boost::begin(r), boost::end(r), p);
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}
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}}
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#endif // BOOST_ALGORITHM_IS_PARTITIONED_UNTIL_HPP
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