156 lines
3.7 KiB
C++
156 lines
3.7 KiB
C++
|
// Boost.Geometry (aka GGL, Generic Geometry Library)
|
||
|
|
|
||
|
|
// Copyright (c) 2014-2021, Oracle and/or its affiliates.
|
||
|
|
// Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
|
||
|
|
// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
|
||
|
|
|
||
|
|
// Licensed under the Boost Software License version 1.0.
|
||
|
|
// http://www.boost.org/users/license.html
|
||
|
|
|
||
|
|
#ifndef BOOST_GEOMETRY_ITERATORS_CONCATENATE_ITERATOR_HPP
|
||
|
|
#define BOOST_GEOMETRY_ITERATORS_CONCATENATE_ITERATOR_HPP
|
||
|
|
|
||
|
|
|
||
|
|
#include <type_traits>
|
||
|
|
|
||
|
|
#include <boost/iterator/iterator_facade.hpp>
|
||
|
|
#include <boost/iterator/iterator_categories.hpp>
|
||
|
|
|
||
|
|
|
||
|
|
namespace boost { namespace geometry
|
||
|
|
{
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
template
|
||
|
|
<
|
||
|
|
typename Iterator1,
|
||
|
|
typename Iterator2,
|
||
|
|
typename Value,
|
||
|
|
typename Reference = Value&
|
||
|
|
>
|
||
|
|
class concatenate_iterator
|
||
|
|
: public boost::iterator_facade
|
||
|
|
<
|
||
|
|
concatenate_iterator<Iterator1, Iterator2, Value, Reference>,
|
||
|
|
Value,
|
||
|
|
boost::bidirectional_traversal_tag,
|
||
|
|
Reference
|
||
|
|
>
|
||
|
|
{
|
||
|
|
private:
|
||
|
|
Iterator1 m_it1, m_end1;
|
||
|
|
Iterator2 m_begin2, m_it2;
|
||
|
|
|
||
|
|
public:
|
||
|
|
typedef Iterator1 first_iterator_type;
|
||
|
|
typedef Iterator2 second_iterator_type;
|
||
|
|
|
||
|
|
// default constructor
|
||
|
|
concatenate_iterator() = default;
|
||
|
|
|
||
|
|
// for begin
|
||
|
|
concatenate_iterator(Iterator1 it1, Iterator1 end1,
|
||
|
|
Iterator2 begin2, Iterator2 it2)
|
||
|
|
: m_it1(it1), m_end1(end1), m_begin2(begin2), m_it2(it2)
|
||
|
|
{}
|
||
|
|
|
||
|
|
// for end
|
||
|
|
concatenate_iterator(Iterator1 end1, Iterator2 begin2, Iterator2 end2)
|
||
|
|
: m_it1(end1), m_end1(end1), m_begin2(begin2), m_it2(end2)
|
||
|
|
{}
|
||
|
|
|
||
|
|
template
|
||
|
|
<
|
||
|
|
typename OtherIt1,
|
||
|
|
typename OtherIt2,
|
||
|
|
typename OtherValue,
|
||
|
|
typename OtherReference,
|
||
|
|
std::enable_if_t
|
||
|
|
<
|
||
|
|
std::is_convertible<OtherIt1, Iterator1>::value
|
||
|
|
&& std::is_convertible<OtherIt2, Iterator2>::value,
|
||
|
|
int
|
||
|
|
> = 0
|
||
|
|
>
|
||
|
|
concatenate_iterator(concatenate_iterator
|
||
|
|
<
|
||
|
|
OtherIt1,
|
||
|
|
OtherIt2,
|
||
|
|
OtherValue,
|
||
|
|
OtherReference
|
||
|
|
> const& other)
|
||
|
|
: m_it1(other.m_it1)
|
||
|
|
, m_end1(other.m_end1)
|
||
|
|
, m_begin2(other.m_begin2)
|
||
|
|
, m_it2(other.m_it2)
|
||
|
|
{}
|
||
|
|
|
||
|
|
concatenate_iterator(concatenate_iterator const& other) = default;
|
||
|
|
|
||
|
|
concatenate_iterator& operator=(concatenate_iterator const& other) = default;
|
||
|
|
|
||
|
|
private:
|
||
|
|
friend class boost::iterator_core_access;
|
||
|
|
|
||
|
|
template <typename It1, typename It2, typename V, typename R>
|
||
|
|
friend class concatenate_iterator;
|
||
|
|
|
||
|
|
inline Reference dereference() const
|
||
|
|
{
|
||
|
|
if ( m_it1 == m_end1 )
|
||
|
|
{
|
||
|
|
return *m_it2;
|
||
|
|
}
|
||
|
|
return *m_it1;
|
||
|
|
}
|
||
|
|
|
||
|
|
template
|
||
|
|
<
|
||
|
|
typename OtherIt1,
|
||
|
|
typename OtherIt2,
|
||
|
|
typename OtherValue,
|
||
|
|
typename OtherReference
|
||
|
|
>
|
||
|
|
inline bool equal(concatenate_iterator
|
||
|
|
<
|
||
|
|
OtherIt1,
|
||
|
|
OtherIt2,
|
||
|
|
OtherValue,
|
||
|
|
OtherReference
|
||
|
|
> const& other) const
|
||
|
|
{
|
||
|
|
return m_it1 == other.m_it1 && m_it2 == other.m_it2;
|
||
|
|
}
|
||
|
|
|
||
|
|
inline void increment()
|
||
|
|
{
|
||
|
|
if ( m_it1 == m_end1 )
|
||
|
|
{
|
||
|
|
++m_it2;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
++m_it1;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
inline void decrement()
|
||
|
|
{
|
||
|
|
if ( m_it2 == m_begin2 )
|
||
|
|
{
|
||
|
|
--m_it1;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
--m_it2;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
}} // namespace boost::geometry
|
||
|
|
|
||
|
|
#endif // BOOST_GEOMETRY_ITERATORS_CONCATENATE_ITERATOR_HPP
|