1 // Copyright Neil Groves 2009. Use, modification and
2 // distribution is subject to the Boost Software License, Version
3 // 1.0. (See accompanying file LICENSE_1_0.txt or copy at
4 // http://www.boost.org/LICENSE_1_0.txt)
5 //
6 //
7 // For more information, see http://www.boost.org/libs/range/
8 //
9 #ifndef BOOST_RANGE_ALGORITHM_COUNT_HPP_INCLUDED
10 #define BOOST_RANGE_ALGORITHM_COUNT_HPP_INCLUDED
11
12 #include <boost/concept_check.hpp>
13 #include <boost/range/begin.hpp>
14 #include <boost/range/end.hpp>
15 #include <boost/range/concepts.hpp>
16 #include <boost/range/difference_type.hpp>
17 #include <algorithm>
18
19 namespace boost
20 {
21 namespace range
22 {
23
24 /// \brief template function count
25 ///
26 /// range-based version of the count std algorithm
27 ///
28 /// \pre SinglePassRange is a model of the SinglePassRangeConcept
29 template< class SinglePassRange, class Value >
30 inline BOOST_DEDUCED_TYPENAME range_difference<SinglePassRange>::type
count(SinglePassRange & rng,const Value & val)31 count(SinglePassRange& rng, const Value& val)
32 {
33 BOOST_RANGE_CONCEPT_ASSERT(( SinglePassRangeConcept<SinglePassRange> ));
34 return std::count(boost::begin(rng), boost::end(rng), val);
35 }
36
37 /// \overload
38 template< class SinglePassRange, class Value >
39 inline BOOST_DEDUCED_TYPENAME range_difference<SinglePassRange const>::type
count(const SinglePassRange & rng,const Value & val)40 count(const SinglePassRange& rng, const Value& val)
41 {
42 BOOST_RANGE_CONCEPT_ASSERT(( SinglePassRangeConcept<const SinglePassRange> ));
43 return std::count(boost::begin(rng), boost::end(rng), val);
44 }
45
46 } // namespace range
47 using range::count;
48 } // namespace boost
49
50 #endif // include guard
51