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
find_if(SinglePassRange & rng,UnaryPredicate pred)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
find_if(const SinglePassRange & rng,UnaryPredicate pred)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
find_if(SinglePassRange & rng,UnaryPredicate pred)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
find_if(const SinglePassRange & rng,UnaryPredicate pred)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
82