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Use a separate template parameter for distance in advance().

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This follows std::advance interface and also allows to use distance types
other than iterator's difference_type (if the iterator supports that).
This commit is contained in:
Andrey Semashev
2017-07-10 14:51:07 +03:00
parent af5f6e49e0
commit 5bfbfb7716
1 changed files with 8 additions and 9 deletions
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17
include/boost/iterator/advance.hpp
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@ -9,17 +9,16 @@
#include <boost/config.hpp>
#include <boost/iterator/iterator_categories.hpp>
#include <boost/iterator/iterator_traits.hpp>
namespace boost {
namespace iterators {
namespace detail {
template <typename InputIterator>
template <typename InputIterator, typename Distance>
inline BOOST_CXX14_CONSTEXPR void
advance_impl(
InputIterator& it
, typename iterator_difference<InputIterator>::type n
, Distance n
, incrementable_traversal_tag
)
{
@ -29,11 +28,11 @@ namespace iterators {
}
}
template <typename BidirectionalIterator>
template <typename BidirectionalIterator, typename Distance>
inline BOOST_CXX14_CONSTEXPR void
advance_impl(
BidirectionalIterator& it
, typename iterator_difference<BidirectionalIterator>::type n
, Distance n
, bidirectional_traversal_tag
)
{
@ -51,11 +50,11 @@ namespace iterators {
}
}
template <typename RandomAccessIterator>
template <typename RandomAccessIterator, typename Distance>
inline BOOST_CXX14_CONSTEXPR void
advance_impl(
RandomAccessIterator& it
, typename iterator_difference<RandomAccessIterator>::type n
, Distance n
, random_access_traversal_tag
)
{
@ -64,9 +63,9 @@ namespace iterators {
}
namespace advance_adl_barrier {
template <typename InputIterator>
template <typename InputIterator, typename Distance>
inline BOOST_CXX14_CONSTEXPR void
advance(InputIterator& it, typename iterator_difference<InputIterator>::type n)
advance(InputIterator& it, Distance n)
{
detail::advance_impl(
it, n, typename iterator_traversal<InputIterator>::type()