ceph/src/boost/libs/range/include/boost/range/algorithm/count_if.hpp

   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_IF_HPP_INCLUDED
  10 #define BOOST_RANGE_ALGORITHM_COUNT_IF_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_if
  25 ///
  26 /// range-based version of the count_if std algorithm
  27 ///
  28 /// \pre SinglePassRange is a model of the SinglePassRangeConcept
  29 /// \pre UnaryPredicate is a model of the UnaryPredicateConcept
  30 template< class SinglePassRange, class UnaryPredicate >
  31 inline BOOST_DEDUCED_TYPENAME boost::range_difference<SinglePassRange>::type
  32 count_if(SinglePassRange& rng, UnaryPredicate pred)
  33 {
  34     BOOST_RANGE_CONCEPT_ASSERT(( SinglePassRangeConcept<SinglePassRange> ));
  35     return std::count_if(boost::begin(rng), boost::end(rng), pred);
  36 }
  37
  38 /// \overload
  39 template< class SinglePassRange, class UnaryPredicate >
  40 inline BOOST_DEDUCED_TYPENAME boost::range_difference<const SinglePassRange>::type
  41 count_if(const SinglePassRange& rng, UnaryPredicate pred)
  42 {
  43     BOOST_RANGE_CONCEPT_ASSERT(( SinglePassRangeConcept<const SinglePassRange> ));
  44     return std::count_if(boost::begin(rng), boost::end(rng), pred);
  45 }
  46
  47     } // namespace range
  48     using range::count_if;
  49 } // namespace boost
  50
  51 #endif // include guard