range/algorithm/lexicographical_compare.hpp

0001 //  Copyright Neil Groves 2009. Use, modification and
0002 //  distribution is subject to the Boost Software License, Version
0003 //  1.0. (See accompanying file LICENSE_1_0.txt or copy at
0004 //  http://www.boost.org/LICENSE_1_0.txt)
0005 //
0006 //
0007 // For more information, see http://www.boost.org/libs/range/
0008 //
0009 #ifndef BOOST_RANGE_ALGORITHM_LEXICOGRAPHICAL_COMPARE_HPP_INCLUDED
0010 #define BOOST_RANGE_ALGORITHM_LEXICOGRAPHICAL_COMPARE_HPP_INCLUDED
0011
0012 #include <boost/concept_check.hpp>
0013 #include <boost/range/begin.hpp>
0014 #include <boost/range/end.hpp>
0015 #include <boost/range/concepts.hpp>
0016 #include <algorithm>
0017
0018 namespace boost
0019 {
0020     namespace range
0021     {
0022
0023 /// \brief template function lexicographic_compare
0024 ///
0025 /// range-based version of the lexicographic_compare std algorithm
0026 ///
0027 /// \pre SinglePassRange1 is a model of the SinglePassRangeConcept
0028 /// \pre SinglePassRange2 is a model of the SinglePassRangeConcept
0029 template<class SinglePassRange1, class SinglePassRange2>
0030 inline bool lexicographical_compare(const SinglePassRange1& rng1,
0031                                     const SinglePassRange2& rng2)
0032 {
0033     BOOST_RANGE_CONCEPT_ASSERT(( SinglePassRangeConcept<const SinglePassRange1> ));
0034     BOOST_RANGE_CONCEPT_ASSERT(( SinglePassRangeConcept<const SinglePassRange2> ));
0035     return std::lexicographical_compare(
0036         boost::begin(rng1), boost::end(rng1),
0037         boost::begin(rng2), boost::end(rng2));
0038 }
0039
0040 /// \overload
0041 template<class SinglePassRange1, class SinglePassRange2,
0042          class BinaryPredicate>
0043 inline bool lexicographical_compare(const SinglePassRange1& rng1,
0044                                     const SinglePassRange2& rng2,
0045                                     BinaryPredicate pred)
0046 {
0047     BOOST_RANGE_CONCEPT_ASSERT(( SinglePassRangeConcept<const SinglePassRange1> ));
0048     BOOST_RANGE_CONCEPT_ASSERT(( SinglePassRangeConcept<const SinglePassRange2> ));
0049     return std::lexicographical_compare(
0050         boost::begin(rng1), boost::end(rng1),
0051         boost::begin(rng2), boost::end(rng2), pred);
0052 }
0053
0054     } // namespace range
0055     using range::lexicographical_compare;
0056 } // namespace boost
0057
0058 #endif // include guard