81 lines
3.5 KiB
C++
81 lines
3.5 KiB
C++
|
/*
|
||
|
|
Copyright (c) Marshall Clow 2014.
|
||
|
|
|
||
|
|
Distributed under the Boost Software License, Version 1.0. (See accompanying
|
||
|
|
file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
||
|
|
*/
|
||
|
|
|
||
|
|
/// \file is_permutation.hpp
|
||
|
|
/// \brief Is a sequence a permutation of another sequence (four iterator versions)
|
||
|
|
/// \author Marshall Clow
|
||
|
|
|
||
|
|
#ifndef BOOST_ALGORITHM_IS_PERMUTATION14_HPP
|
||
|
|
#define BOOST_ALGORITHM_IS_PERMUTATION14_HPP
|
||
|
|
|
||
|
|
#include <utility> // for std::pair
|
||
|
|
#include <functional> // for std::equal_to
|
||
|
|
#include <iterator>
|
||
|
|
|
||
|
|
#include <boost/config.hpp>
|
||
|
|
#include <boost/algorithm/cxx11/is_permutation.hpp>
|
||
|
|
#include <boost/algorithm/cxx14/mismatch.hpp>
|
||
|
|
|
||
|
|
namespace boost { namespace algorithm {
|
||
|
|
|
||
|
|
/// \fn is_permutation ( ForwardIterator1 first, ForwardIterator1 last,
|
||
|
|
/// ForwardIterator2 first2, ForwardIterator2 last2 )
|
||
|
|
/// \brief Tests to see if the sequence [first,last) is a permutation of the sequence starting at first2
|
||
|
|
///
|
||
|
|
/// \param first1 The start of the input sequence
|
||
|
|
/// \param last2 One past the end of the input sequence
|
||
|
|
/// \param first2 The start of the second sequence
|
||
|
|
/// \param last1 One past the end of the second sequence
|
||
|
|
/// \note This function is part of the C++2014 standard library.
|
||
|
|
template< class ForwardIterator1, class ForwardIterator2 >
|
||
|
|
bool is_permutation ( ForwardIterator1 first1, ForwardIterator1 last1,
|
||
|
|
ForwardIterator2 first2, ForwardIterator2 last2 )
|
||
|
|
{
|
||
|
|
// How should I deal with the idea that ForwardIterator1::value_type
|
||
|
|
// and ForwardIterator2::value_type could be different? Define my own comparison predicate?
|
||
|
|
std::pair<ForwardIterator1, ForwardIterator2> eq = boost::algorithm::mismatch
|
||
|
|
( first1, last1, first2, last2 );
|
||
|
|
if ( eq.first == last1 && eq.second == last2)
|
||
|
|
return true;
|
||
|
|
return boost::algorithm::detail::is_permutation_tag (
|
||
|
|
eq.first, last1, eq.second, last2,
|
||
|
|
std::equal_to<typename std::iterator_traits<ForwardIterator1>::value_type> (),
|
||
|
|
typename std::iterator_traits<ForwardIterator1>::iterator_category (),
|
||
|
|
typename std::iterator_traits<ForwardIterator2>::iterator_category ());
|
||
|
|
}
|
||
|
|
|
||
|
|
/// \fn is_permutation ( ForwardIterator1 first, ForwardIterator1 last,
|
||
|
|
/// ForwardIterator2 first2, ForwardIterator2 last2,
|
||
|
|
/// BinaryPredicate p )
|
||
|
|
/// \brief Tests to see if the sequence [first,last) is a permutation of the sequence starting at first2
|
||
|
|
///
|
||
|
|
/// \param first1 The start of the input sequence
|
||
|
|
/// \param last1 One past the end of the input sequence
|
||
|
|
/// \param first2 The start of the second sequence
|
||
|
|
/// \param last2 One past the end of the second sequence
|
||
|
|
/// \param pred The predicate to compare elements with
|
||
|
|
///
|
||
|
|
/// \note This function is part of the C++2014 standard library.
|
||
|
|
template< class ForwardIterator1, class ForwardIterator2, class BinaryPredicate >
|
||
|
|
bool is_permutation ( ForwardIterator1 first1, ForwardIterator1 last1,
|
||
|
|
ForwardIterator2 first2, ForwardIterator2 last2,
|
||
|
|
BinaryPredicate pred )
|
||
|
|
{
|
||
|
|
std::pair<ForwardIterator1, ForwardIterator2> eq = boost::algorithm::mismatch
|
||
|
|
( first1, last1, first2, last2, pred );
|
||
|
|
if ( eq.first == last1 && eq.second == last2)
|
||
|
|
return true;
|
||
|
|
return boost::algorithm::detail::is_permutation_tag (
|
||
|
|
first1, last1, first2, last2, pred,
|
||
|
|
typename std::iterator_traits<ForwardIterator1>::iterator_category (),
|
||
|
|
typename std::iterator_traits<ForwardIterator2>::iterator_category ());
|
||
|
|
}
|
||
|
|
|
||
|
|
}}
|
||
|
|
|
||
|
|
#endif // BOOST_ALGORITHM_IS_PERMUTATION14_HPP
|