201 lines
9.0 KiB
Plaintext
201 lines
9.0 KiB
Plaintext
|
// Boost.Range library
|
||
|
|
//
|
||
|
|
// Copyright Neil Groves 2009.
|
||
|
|
// Use, modification and distribution is subject to 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)
|
||
|
|
//
|
||
|
|
// For more information, see http://www.boost.org/libs/range/
|
||
|
|
//
|
||
|
|
#ifndef BOOST_RANGE_ALGORITHM_EQUAL_HPP_INCLUDED
|
||
|
|
#define BOOST_RANGE_ALGORITHM_EQUAL_HPP_INCLUDED
|
||
|
|
|
||
|
|
#include <boost/config.hpp>
|
||
|
|
#include <boost/range/concepts.hpp>
|
||
|
|
#include <iterator>
|
||
|
|
|
||
|
|
namespace boost
|
||
|
|
{
|
||
|
|
namespace range_detail
|
||
|
|
{
|
||
|
|
// An implementation of equality comparison that is optimized for iterator
|
||
|
|
// traversal categories less than RandomAccessTraversal.
|
||
|
|
template< class SinglePassTraversalReadableIterator1,
|
||
|
|
class SinglePassTraversalReadableIterator2,
|
||
|
|
class IteratorCategoryTag1,
|
||
|
|
class IteratorCategoryTag2 >
|
||
|
|
inline bool equal_impl( SinglePassTraversalReadableIterator1 first1,
|
||
|
|
SinglePassTraversalReadableIterator1 last1,
|
||
|
|
SinglePassTraversalReadableIterator2 first2,
|
||
|
|
SinglePassTraversalReadableIterator2 last2,
|
||
|
|
IteratorCategoryTag1,
|
||
|
|
IteratorCategoryTag2 )
|
||
|
|
{
|
||
|
|
for (;;)
|
||
|
|
{
|
||
|
|
// If we have reached the end of the left range then this is
|
||
|
|
// the end of the loop. They are equal if and only if we have
|
||
|
|
// simultaneously reached the end of the right range.
|
||
|
|
if (first1 == last1)
|
||
|
|
return first2 == last2;
|
||
|
|
|
||
|
|
// If we have reached the end of the right range at this line
|
||
|
|
// it indicates that the right range is shorter than the left
|
||
|
|
// and hence the result is false.
|
||
|
|
if (first2 == last2)
|
||
|
|
return false;
|
||
|
|
|
||
|
|
// continue looping if and only if the values are equal
|
||
|
|
if (*first1 != *first2)
|
||
|
|
break;
|
||
|
|
|
||
|
|
++first1;
|
||
|
|
++first2;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Reaching this line in the algorithm indicates that a value
|
||
|
|
// inequality has been detected.
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
template< class SinglePassTraversalReadableIterator1,
|
||
|
|
class SinglePassTraversalReadableIterator2,
|
||
|
|
class IteratorCategoryTag1,
|
||
|
|
class IteratorCategoryTag2,
|
||
|
|
class BinaryPredicate >
|
||
|
|
inline bool equal_impl( SinglePassTraversalReadableIterator1 first1,
|
||
|
|
SinglePassTraversalReadableIterator1 last1,
|
||
|
|
SinglePassTraversalReadableIterator2 first2,
|
||
|
|
SinglePassTraversalReadableIterator2 last2,
|
||
|
|
BinaryPredicate pred,
|
||
|
|
IteratorCategoryTag1,
|
||
|
|
IteratorCategoryTag2 )
|
||
|
|
{
|
||
|
|
for (;;)
|
||
|
|
{
|
||
|
|
// If we have reached the end of the left range then this is
|
||
|
|
// the end of the loop. They are equal if and only if we have
|
||
|
|
// simultaneously reached the end of the right range.
|
||
|
|
if (first1 == last1)
|
||
|
|
return first2 == last2;
|
||
|
|
|
||
|
|
// If we have reached the end of the right range at this line
|
||
|
|
// it indicates that the right range is shorter than the left
|
||
|
|
// and hence the result is false.
|
||
|
|
if (first2 == last2)
|
||
|
|
return false;
|
||
|
|
|
||
|
|
// continue looping if and only if the values are equal
|
||
|
|
if (!pred(*first1, *first2))
|
||
|
|
break;
|
||
|
|
|
||
|
|
++first1;
|
||
|
|
++first2;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Reaching this line in the algorithm indicates that a value
|
||
|
|
// inequality has been detected.
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
// An implementation of equality comparison that is optimized for
|
||
|
|
// random access iterators.
|
||
|
|
template< class RandomAccessTraversalReadableIterator1,
|
||
|
|
class RandomAccessTraversalReadableIterator2 >
|
||
|
|
inline bool equal_impl( RandomAccessTraversalReadableIterator1 first1,
|
||
|
|
RandomAccessTraversalReadableIterator1 last1,
|
||
|
|
RandomAccessTraversalReadableIterator2 first2,
|
||
|
|
RandomAccessTraversalReadableIterator2 last2,
|
||
|
|
std::random_access_iterator_tag,
|
||
|
|
std::random_access_iterator_tag )
|
||
|
|
{
|
||
|
|
return ((last1 - first1) == (last2 - first2))
|
||
|
|
&& std::equal(first1, last1, first2);
|
||
|
|
}
|
||
|
|
|
||
|
|
template< class RandomAccessTraversalReadableIterator1,
|
||
|
|
class RandomAccessTraversalReadableIterator2,
|
||
|
|
class BinaryPredicate >
|
||
|
|
inline bool equal_impl( RandomAccessTraversalReadableIterator1 first1,
|
||
|
|
RandomAccessTraversalReadableIterator1 last1,
|
||
|
|
RandomAccessTraversalReadableIterator2 first2,
|
||
|
|
RandomAccessTraversalReadableIterator2 last2,
|
||
|
|
BinaryPredicate pred,
|
||
|
|
std::random_access_iterator_tag,
|
||
|
|
std::random_access_iterator_tag )
|
||
|
|
{
|
||
|
|
return ((last1 - first1) == (last2 - first2))
|
||
|
|
&& std::equal(first1, last1, first2, pred);
|
||
|
|
}
|
||
|
|
|
||
|
|
template< class SinglePassTraversalReadableIterator1,
|
||
|
|
class SinglePassTraversalReadableIterator2 >
|
||
|
|
inline bool equal( SinglePassTraversalReadableIterator1 first1,
|
||
|
|
SinglePassTraversalReadableIterator1 last1,
|
||
|
|
SinglePassTraversalReadableIterator2 first2,
|
||
|
|
SinglePassTraversalReadableIterator2 last2 )
|
||
|
|
{
|
||
|
|
BOOST_DEDUCED_TYPENAME std::iterator_traits< SinglePassTraversalReadableIterator1 >::iterator_category tag1;
|
||
|
|
BOOST_DEDUCED_TYPENAME std::iterator_traits< SinglePassTraversalReadableIterator2 >::iterator_category tag2;
|
||
|
|
|
||
|
|
return equal_impl(first1, last1, first2, last2, tag1, tag2);
|
||
|
|
}
|
||
|
|
|
||
|
|
template< class SinglePassTraversalReadableIterator1,
|
||
|
|
class SinglePassTraversalReadableIterator2,
|
||
|
|
class BinaryPredicate >
|
||
|
|
inline bool equal( SinglePassTraversalReadableIterator1 first1,
|
||
|
|
SinglePassTraversalReadableIterator1 last1,
|
||
|
|
SinglePassTraversalReadableIterator2 first2,
|
||
|
|
SinglePassTraversalReadableIterator2 last2,
|
||
|
|
BinaryPredicate pred )
|
||
|
|
{
|
||
|
|
BOOST_DEDUCED_TYPENAME std::iterator_traits< SinglePassTraversalReadableIterator1 >::iterator_category tag1;
|
||
|
|
BOOST_DEDUCED_TYPENAME std::iterator_traits< SinglePassTraversalReadableIterator2 >::iterator_category tag2;
|
||
|
|
|
||
|
|
return equal_impl(first1, last1, first2, last2, pred, tag1, tag2);
|
||
|
|
}
|
||
|
|
|
||
|
|
} // namespace range_detail
|
||
|
|
|
||
|
|
namespace range
|
||
|
|
{
|
||
|
|
|
||
|
|
/// \brief template function equal
|
||
|
|
///
|
||
|
|
/// range-based version of the equal std algorithm
|
||
|
|
///
|
||
|
|
/// \pre SinglePassRange1 is a model of the SinglePassRangeConcept
|
||
|
|
/// \pre SinglePassRange2 is a model of the SinglePassRangeConcept
|
||
|
|
/// \pre BinaryPredicate is a model of the BinaryPredicateConcept
|
||
|
|
template< class SinglePassRange1, class SinglePassRange2 >
|
||
|
|
inline bool equal( const SinglePassRange1& rng1, const SinglePassRange2& rng2 )
|
||
|
|
{
|
||
|
|
BOOST_RANGE_CONCEPT_ASSERT(( SinglePassRangeConcept<const SinglePassRange1> ));
|
||
|
|
BOOST_RANGE_CONCEPT_ASSERT(( SinglePassRangeConcept<const SinglePassRange2> ));
|
||
|
|
|
||
|
|
return ::boost::range_detail::equal(
|
||
|
|
::boost::begin(rng1), ::boost::end(rng1),
|
||
|
|
::boost::begin(rng2), ::boost::end(rng2) );
|
||
|
|
}
|
||
|
|
|
||
|
|
/// \overload
|
||
|
|
template< class SinglePassRange1, class SinglePassRange2, class BinaryPredicate >
|
||
|
|
inline bool equal( const SinglePassRange1& rng1, const SinglePassRange2& rng2,
|
||
|
|
BinaryPredicate pred )
|
||
|
|
{
|
||
|
|
BOOST_RANGE_CONCEPT_ASSERT(( SinglePassRangeConcept<const SinglePassRange1> ));
|
||
|
|
BOOST_RANGE_CONCEPT_ASSERT(( SinglePassRangeConcept<const SinglePassRange2> ));
|
||
|
|
|
||
|
|
return ::boost::range_detail::equal(
|
||
|
|
::boost::begin(rng1), ::boost::end(rng1),
|
||
|
|
::boost::begin(rng2), ::boost::end(rng2),
|
||
|
|
pred);
|
||
|
|
}
|
||
|
|
|
||
|
|
} // namespace range
|
||
|
|
using ::boost::range::equal;
|
||
|
|
} // namespace boost
|
||
|
|
|
||
|
|
#endif // include guard
|