ceph/src/boost/libs/range/include/boost/range/algorithm/find_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_FIND_IF_HPP_INCLUDED
  10 #define BOOST_RANGE_ALGORITHM_FIND_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/detail/range_return.hpp>
  17 #include <algorithm>
  18
  19 namespace boost
  20 {
  21     namespace range
  22     {
  23
  24 /// \brief template function find_if
  25 ///
  26 /// range-based version of the find_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 disable_if<
  32     is_const<SinglePassRange>,
  33     BOOST_DEDUCED_TYPENAME range_iterator<SinglePassRange>::type
  34 >::type
  35 find_if( SinglePassRange& rng, UnaryPredicate pred )
  36 {
  37     BOOST_RANGE_CONCEPT_ASSERT(( SinglePassRangeConcept<SinglePassRange> ));
  38     return std::find_if(boost::begin(rng), boost::end(rng), pred);
  39 }
  40
  41 /// \overload
  42 template< class SinglePassRange, class UnaryPredicate >
  43 inline BOOST_DEDUCED_TYPENAME range_iterator<const SinglePassRange>::type
  44 find_if( const SinglePassRange& rng, UnaryPredicate pred )
  45 {
  46     BOOST_RANGE_CONCEPT_ASSERT(( SinglePassRangeConcept<const SinglePassRange> ));
  47     return std::find_if(boost::begin(rng), boost::end(rng), pred);
  48 }
  49
  50 // range_return overloads
  51
  52 /// \overload
  53 template< range_return_value re, class SinglePassRange, class UnaryPredicate >
  54 inline BOOST_DEDUCED_TYPENAME disable_if<
  55     is_const<SinglePassRange>,
  56     BOOST_DEDUCED_TYPENAME range_return<SinglePassRange,re>::type
  57 >::type
  58 find_if( SinglePassRange& rng, UnaryPredicate pred )
  59 {
  60     BOOST_RANGE_CONCEPT_ASSERT(( SinglePassRangeConcept<SinglePassRange> ));
  61     return range_return<SinglePassRange,re>::
  62         pack(std::find_if(boost::begin(rng), boost::end(rng), pred),
  63              rng);
  64 }
  65
  66 /// \overload
  67 template< range_return_value re, class SinglePassRange, class UnaryPredicate >
  68 inline BOOST_DEDUCED_TYPENAME range_return<const SinglePassRange,re>::type
  69 find_if( const SinglePassRange& rng, UnaryPredicate pred )
  70 {
  71     BOOST_RANGE_CONCEPT_ASSERT(( SinglePassRangeConcept<const SinglePassRange> ));
  72     return range_return<const SinglePassRange,re>::
  73         pack(std::find_if(boost::begin(rng), boost::end(rng), pred),
  74              rng);
  75 }
  76
  77     } // namespace range
  78     using range::find_if;
  79 } // namespace boost
  80
  81 #endif // include guard