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one_of.hpp
/* Copyright (c) Marshall Clow 2008-2012. Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) */ /// \file one_of.hpp /// \brief Test ranges to see if only one element matches a value or predicate. /// \author Marshall Clow #ifndef BOOST_ALGORITHM_ONE_OF_HPP #define BOOST_ALGORITHM_ONE_OF_HPP #include <boost/config.hpp> #include <boost/range/begin.hpp> #include <boost/range/end.hpp> #include <boost/algorithm/cxx11/none_of.hpp> namespace boost { namespace algorithm { /// \fn one_of ( InputIterator first, InputIterator last, Predicate p ) /// \return true if the predicate 'p' is true for exactly one item in [first, last). /// /// \param first The start of the input sequence /// \param last One past the end of the input sequence /// \param p A predicate for testing the elements of the sequence /// template<typename InputIterator, typename Predicate> BOOST_CXX14_CONSTEXPR bool one_of ( InputIterator first, InputIterator last, Predicate p ) { // find_if for (; first != last; ++first) if (p(*first)) break; if (first == last) return false; // Didn't occur at all return boost::algorithm::none_of (++first, last, p); } /// \fn one_of ( const Range &r, Predicate p ) /// \return true if the predicate 'p' is true for exactly one item in the range. /// /// \param r The input range /// \param p A predicate for testing the elements of the range /// template<typename Range, typename Predicate> BOOST_CXX14_CONSTEXPR bool one_of ( const Range &r, Predicate p ) { return boost::algorithm::one_of ( boost::begin (r), boost::end (r), p ); } /// \fn one_of_equal ( InputIterator first, InputIterator last, const V &val ) /// \return true if the value 'val' exists only once in [first, last). /// /// \param first The start of the input sequence /// \param last One past the end of the input sequence /// \param val A value to compare against /// template<typename InputIterator, typename V> BOOST_CXX14_CONSTEXPR bool one_of_equal ( InputIterator first, InputIterator last, const V &val ) { // find for (; first != last; ++first) if (*first == val) break; if (first == last) return false; // Didn't occur at all return boost::algorithm::none_of_equal (++first, last, val); } /// \fn one_of_equal ( const Range &r, const V &val ) /// \return true if the value 'val' exists only once in the range. /// /// \param r The input range /// \param val A value to compare against /// template<typename Range, typename V> BOOST_CXX14_CONSTEXPR bool one_of_equal ( const Range &r, const V &val ) { return boost::algorithm::one_of_equal ( boost::begin (r), boost::end (r), val ); } }} // namespace boost and algorithm #endif // BOOST_ALGORITHM_ALL_HPP