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File indexing completed on 2025-01-18 09:51:14

0001 //  Copyright Neil Groves 2009. Use, modification and
0002 //  distribution is subject to the Boost Software License, Version
0003 //  1.0. (See accompanying file LICENSE_1_0.txt or copy at
0004 //  http://www.boost.org/LICENSE_1_0.txt)
0005 //
0006 //
0007 // For more information, see http://www.boost.org/libs/range/
0008 //
0009 #ifndef BOOST_RANGE_ALGORITHM_COUNT_IF_HPP_INCLUDED
0010 #define BOOST_RANGE_ALGORITHM_COUNT_IF_HPP_INCLUDED
0011 
0012 #include <boost/concept_check.hpp>
0013 #include <boost/range/begin.hpp>
0014 #include <boost/range/end.hpp>
0015 #include <boost/range/concepts.hpp>
0016 #include <boost/range/difference_type.hpp>
0017 #include <algorithm>
0018 
0019 namespace boost
0020 {
0021     namespace range
0022     {
0023 
0024 /// \brief template function count_if
0025 ///
0026 /// range-based version of the count_if std algorithm
0027 ///
0028 /// \pre SinglePassRange is a model of the SinglePassRangeConcept
0029 /// \pre UnaryPredicate is a model of the UnaryPredicateConcept
0030 template< class SinglePassRange, class UnaryPredicate >
0031 inline BOOST_DEDUCED_TYPENAME boost::range_difference<SinglePassRange>::type
0032 count_if(SinglePassRange& rng, UnaryPredicate pred)
0033 {
0034     BOOST_RANGE_CONCEPT_ASSERT(( SinglePassRangeConcept<SinglePassRange> ));
0035     return std::count_if(boost::begin(rng), boost::end(rng), pred);
0036 }
0037 
0038 /// \overload
0039 template< class SinglePassRange, class UnaryPredicate >
0040 inline BOOST_DEDUCED_TYPENAME boost::range_difference<const SinglePassRange>::type
0041 count_if(const SinglePassRange& rng, UnaryPredicate pred)
0042 {
0043     BOOST_RANGE_CONCEPT_ASSERT(( SinglePassRangeConcept<const SinglePassRange> ));
0044     return std::count_if(boost::begin(rng), boost::end(rng), pred);
0045 }
0046 
0047     } // namespace range
0048     using range::count_if;
0049 } // namespace boost
0050 
0051 #endif // include guard