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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_LEXICOGRAPHICAL_COMPARE_HPP_INCLUDED
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10 #define BOOST_RANGE_ALGORITHM_LEXICOGRAPHICAL_COMPARE_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 <algorithm>
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17
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18 namespace boost
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19 {
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20 namespace range
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21 {
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22
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23 /// \brief template function lexicographic_compare
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24 ///
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25 /// range-based version of the lexicographic_compare std algorithm
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26 ///
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27 /// \pre SinglePassRange1 is a model of the SinglePassRangeConcept
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28 /// \pre SinglePassRange2 is a model of the SinglePassRangeConcept
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29 template<class SinglePassRange1, class SinglePassRange2>
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30 inline bool lexicographical_compare(const SinglePassRange1& rng1,
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31 const SinglePassRange2& rng2)
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32 {
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33 BOOST_RANGE_CONCEPT_ASSERT(( SinglePassRangeConcept<const SinglePassRange1> ));
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34 BOOST_RANGE_CONCEPT_ASSERT(( SinglePassRangeConcept<const SinglePassRange2> ));
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35 return std::lexicographical_compare(
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36 boost::begin(rng1), boost::end(rng1),
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37 boost::begin(rng2), boost::end(rng2));
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38 }
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39
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40 /// \overload
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41 template<class SinglePassRange1, class SinglePassRange2,
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42 class BinaryPredicate>
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43 inline bool lexicographical_compare(const SinglePassRange1& rng1,
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44 const SinglePassRange2& rng2,
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45 BinaryPredicate pred)
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46 {
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47 BOOST_RANGE_CONCEPT_ASSERT(( SinglePassRangeConcept<const SinglePassRange1> ));
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48 BOOST_RANGE_CONCEPT_ASSERT(( SinglePassRangeConcept<const SinglePassRange2> ));
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49 return std::lexicographical_compare(
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50 boost::begin(rng1), boost::end(rng1),
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51 boost::begin(rng2), boost::end(rng2), pred);
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52 }
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53
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54 } // namespace range
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55 using range::lexicographical_compare;
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56 } // namespace boost
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57
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58 #endif // include guard
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