Chris@16: //  Copyright Neil Groves 2009. Use, modification and
Chris@16: //  distribution is subject to the Boost Software License, Version
Chris@16: //  1.0. (See accompanying file LICENSE_1_0.txt or copy at
Chris@16: //  http://www.boost.org/LICENSE_1_0.txt)
Chris@16: //
Chris@16: //
Chris@16: // For more information, see http://www.boost.org/libs/range/
Chris@16: //
Chris@16: #ifndef BOOST_RANGE_ALGORITHM_COUNT_IF_HPP_INCLUDED
Chris@16: #define BOOST_RANGE_ALGORITHM_COUNT_IF_HPP_INCLUDED
Chris@16: 
Chris@16: #include <boost/concept_check.hpp>
Chris@16: #include <boost/range/begin.hpp>
Chris@16: #include <boost/range/end.hpp>
Chris@16: #include <boost/range/concepts.hpp>
Chris@16: #include <boost/range/difference_type.hpp>
Chris@16: #include <algorithm>
Chris@16: 
Chris@16: namespace boost
Chris@16: {
Chris@16:     namespace range
Chris@16:     {
Chris@16: 
Chris@16: /// \brief template function count_if
Chris@16: ///
Chris@16: /// range-based version of the count_if std algorithm
Chris@16: ///
Chris@16: /// \pre SinglePassRange is a model of the SinglePassRangeConcept
Chris@16: /// \pre UnaryPredicate is a model of the UnaryPredicateConcept
Chris@16: template< class SinglePassRange, class UnaryPredicate >
Chris@16: inline BOOST_DEDUCED_TYPENAME boost::range_difference<SinglePassRange>::type
Chris@16: count_if(SinglePassRange& rng, UnaryPredicate pred)
Chris@16: {
Chris@16:     BOOST_RANGE_CONCEPT_ASSERT(( SinglePassRangeConcept<SinglePassRange> ));
Chris@16:     return std::count_if(boost::begin(rng), boost::end(rng), pred);
Chris@16: }
Chris@16: 
Chris@16: /// \overload
Chris@16: template< class SinglePassRange, class UnaryPredicate >
Chris@16: inline BOOST_DEDUCED_TYPENAME boost::range_difference<const SinglePassRange>::type
Chris@16: count_if(const SinglePassRange& rng, UnaryPredicate pred)
Chris@16: {
Chris@16:     BOOST_RANGE_CONCEPT_ASSERT(( SinglePassRangeConcept<const SinglePassRange> ));
Chris@16:     return std::count_if(boost::begin(rng), boost::end(rng), pred);
Chris@16: }
Chris@16: 
Chris@16:     } // namespace range
Chris@16:     using range::count_if;
Chris@16: } // namespace boost
Chris@16: 
Chris@16: #endif // include guard