range/algorithm/count.hpp

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_HPP_INCLUDED
0010 #define BOOST_RANGE_ALGORITHM_COUNT_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
0025 ///
0026 /// range-based version of the count std algorithm
0027 ///
0028 /// \pre SinglePassRange is a model of the SinglePassRangeConcept
0029 template< class SinglePassRange, class Value >
0030 inline BOOST_DEDUCED_TYPENAME range_difference<SinglePassRange>::type
0031 count(SinglePassRange& rng, const Value& val)
0032 {
0033     BOOST_RANGE_CONCEPT_ASSERT(( SinglePassRangeConcept<SinglePassRange> ));
0034     return std::count(boost::begin(rng), boost::end(rng), val);
0035 }
0036
0037 /// \overload
0038 template< class SinglePassRange, class Value >
0039 inline BOOST_DEDUCED_TYPENAME range_difference<SinglePassRange const>::type
0040 count(const SinglePassRange& rng, const Value& val)
0041 {
0042     BOOST_RANGE_CONCEPT_ASSERT(( SinglePassRangeConcept<const SinglePassRange> ));
0043     return std::count(boost::begin(rng), boost::end(rng), val);
0044 }
0045
0046     } // namespace range
0047     using range::count;
0048 } // namespace boost
0049
0050 #endif // include guard