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1 // Copyright Neil Groves 2009. Use, modification and
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2 // distribution is subject to the Boost Software License, Version
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3 // 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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4 // http://www.boost.org/LICENSE_1_0.txt)
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5 //
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6 //
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7 // For more information, see http://www.boost.org/libs/range/
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8 //
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9 #ifndef BOOST_RANGE_ALGORITHM_FIND_HPP_INCLUDED
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10 #define BOOST_RANGE_ALGORITHM_FIND_HPP_INCLUDED
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11
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12 #include <boost/concept_check.hpp>
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13 #include <boost/range/begin.hpp>
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14 #include <boost/range/end.hpp>
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15 #include <boost/range/concepts.hpp>
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16 #include <boost/range/detail/range_return.hpp>
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17 #include <algorithm>
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18
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19 namespace boost
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20 {
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21 namespace range
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22 {
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23
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24 /// \brief template function find
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25 ///
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26 /// range-based version of the find std algorithm
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27 ///
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28 /// \pre SinglePassRange is a model of the SinglePassRangeConcept
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29 template< class SinglePassRange, class Value >
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30 inline BOOST_DEDUCED_TYPENAME disable_if<
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31 is_const<SinglePassRange>,
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32 BOOST_DEDUCED_TYPENAME range_iterator<SinglePassRange>::type
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33 >::type
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34 find( SinglePassRange& rng, const Value& val )
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35 {
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36 BOOST_RANGE_CONCEPT_ASSERT(( SinglePassRangeConcept<SinglePassRange> ));
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37 return std::find(boost::begin(rng), boost::end(rng), val);
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38 }
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39
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40 /// \overload
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41 template< class SinglePassRange, class Value >
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42 inline BOOST_DEDUCED_TYPENAME range_iterator<const SinglePassRange>::type
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43 find( const SinglePassRange& rng, const Value& val )
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44 {
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45 BOOST_RANGE_CONCEPT_ASSERT(( SinglePassRangeConcept<const SinglePassRange> ));
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46 return std::find(boost::begin(rng), boost::end(rng), val);
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47 }
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48
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49 // range_return overloads
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50
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51 /// \overload
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52 template< range_return_value re, class SinglePassRange, class Value >
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53 inline BOOST_DEDUCED_TYPENAME disable_if<
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54 is_const<SinglePassRange>,
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55 BOOST_DEDUCED_TYPENAME range_return<SinglePassRange,re>::type
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56 >::type
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57 find( SinglePassRange& rng, const Value& val )
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58 {
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59 BOOST_RANGE_CONCEPT_ASSERT(( SinglePassRangeConcept<SinglePassRange> ));
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60 return range_return<SinglePassRange,re>::
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61 pack(std::find(boost::begin(rng), boost::end(rng), val),
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62 rng);
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63 }
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64
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65 /// \overload
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66 template< range_return_value re, class SinglePassRange, class Value >
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67 inline BOOST_DEDUCED_TYPENAME range_return<const SinglePassRange,re>::type
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68 find( const SinglePassRange& rng, const Value& val )
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69 {
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70 BOOST_RANGE_CONCEPT_ASSERT(( SinglePassRangeConcept<const SinglePassRange> ));
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71 return range_return<const SinglePassRange,re>::
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72 pack(std::find(boost::begin(rng), boost::end(rng), val),
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73 rng);
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74 }
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75
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76 } // namespace range
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77 using range::find;
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78 }
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79
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80 #endif // include guard
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