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Convert boost::iterator traversal tags into std tags to avoid unneeded overloads that confuse some older compilers like MSVC 12

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This commit is contained in:
Ion Gaztañaga
2021-12-30 23:08:53 +01:00
parent 01b4f6264c
commit 0be2758375
1 changed files with 51 additions and 66 deletions
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117
include/boost/intrusive/detail/iterator.hpp
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@@ -63,26 +63,59 @@ struct iterator
typedef Reference reference;
};
////////////////////////////////////////
// iterator_[dis|en]able_if_boost_iterator
////////////////////////////////////////
template<class I>
struct is_boost_iterator
////////////////////////////////////////////////////////////////////////////////
// Conversion from boost::iterator traversals to std tags
////////////////////////////////////////////////////////////////////////////////
template<class Tag>
struct get_std_category_from_tag
{
static const bool value = false;
typedef Tag type;
};
template<class Category, class Traversal>
struct is_boost_iterator< boost::iterators::detail::iterator_category_with_traversal<Category, Traversal> >
template <class Category>
struct get_std_category_from_tag
<boost::iterators::detail::iterator_category_with_traversal
<Category, boost::iterators::incrementable_traversal_tag> >
{
static const bool value = true;
typedef std::input_iterator_tag type;
};
template<class I, class R = void>
struct iterator_enable_if_boost_iterator
: ::boost::move_detail::enable_if_c
< is_boost_iterator<typename boost::intrusive::iterator_traits<I>::iterator_category >::value
, R>
template <class Category>
struct get_std_category_from_tag
<boost::iterators::detail::iterator_category_with_traversal
<Category, boost::iterators::single_pass_traversal_tag> >
{
typedef std::input_iterator_tag type;
};
template <class Category>
struct get_std_category_from_tag
<boost::iterators::detail::iterator_category_with_traversal
<Category, boost::iterators::forward_traversal_tag> >
{
typedef std::input_iterator_tag type;
};
template <class Category>
struct get_std_category_from_tag
<boost::iterators::detail::iterator_category_with_traversal
<Category, boost::iterators::bidirectional_traversal_tag> >
{
typedef std::bidirectional_iterator_tag type;
};
template <class Category>
struct get_std_category_from_tag
<boost::iterators::detail::iterator_category_with_traversal
<Category, boost::iterators::random_access_traversal_tag> >
{
typedef std::random_access_iterator_tag type;
};
template<class It>
struct get_std_category_from_it
: get_std_category_from_tag< typename boost::intrusive::iterator_traits<It>::iterator_category >
{};
////////////////////////////////////////
@@ -92,7 +125,7 @@ template<class I, class Tag, class R = void>
struct iterator_enable_if_tag
: ::boost::move_detail::enable_if_c
< ::boost::move_detail::is_same
< typename boost::intrusive::iterator_traits<I>::iterator_category
< typename get_std_category_from_it<I>::type
, Tag
>::value
, R>
@@ -102,7 +135,7 @@ template<class I, class Tag, class R = void>
struct iterator_disable_if_tag
: ::boost::move_detail::enable_if_c
< !::boost::move_detail::is_same
< typename boost::intrusive::iterator_traits<I>::iterator_category
< typename get_std_category_from_it<I>::type
, Tag
>::value
, R>
@@ -115,11 +148,11 @@ template<class I, class Tag, class Tag2, class R = void>
struct iterator_enable_if_convertible_tag
: ::boost::move_detail::enable_if_c
< ::boost::move_detail::is_same_or_convertible
< typename boost::intrusive::iterator_traits<I>::iterator_category
< typename get_std_category_from_it<I>::type
, Tag
>::value &&
!::boost::move_detail::is_same_or_convertible
< typename boost::intrusive::iterator_traits<I>::iterator_category
< typename get_std_category_from_it<I>::type
, Tag2
>::value
, R>
@@ -175,54 +208,6 @@ BOOST_INTRUSIVE_FORCEINLINE typename iterator_enable_if_tag<InputIt, std::random
it += n;
}
template<class InputIt>
BOOST_INTRUSIVE_FORCEINLINE typename iterator_enable_if_convertible_tag
<InputIt, const boost::iterators::incrementable_traversal_tag&, const boost::iterators::single_pass_traversal_tag&>::type
iterator_advance(InputIt& it, typename iterator_traits<InputIt>::difference_type n)
{
while(n--)
++it;
}
template<class InputIt>
BOOST_INTRUSIVE_FORCEINLINE typename iterator_enable_if_convertible_tag
<InputIt, const boost::iterators::single_pass_traversal_tag &, const boost::iterators::forward_traversal_tag&>::type
iterator_advance(InputIt& it, typename iterator_traits<InputIt>::difference_type n)
{
while(n--)
++it;
}
template<class InputIt>
BOOST_INTRUSIVE_FORCEINLINE typename iterator_enable_if_convertible_tag
<InputIt, const boost::iterators::forward_traversal_tag&, const boost::iterators::bidirectional_traversal_tag&>::type
iterator_advance(InputIt& it, typename iterator_traits<InputIt>::difference_type n)
{
while(n--)
++it;
}
template<class InputIt>
BOOST_INTRUSIVE_FORCEINLINE typename iterator_enable_if_convertible_tag
<InputIt, const boost::iterators::bidirectional_traversal_tag&, const boost::iterators::random_access_traversal_tag&>::type
iterator_advance(InputIt& it, typename iterator_traits<InputIt>::difference_type n)
{
for (; 0 < n; --n)
++it;
for (; n < 0; ++n)
--it;
}
class fake{};
template<class InputIt>
BOOST_INTRUSIVE_FORCEINLINE typename iterator_enable_if_convertible_tag
<InputIt, const boost::iterators::random_access_traversal_tag&, const fake&>::type
iterator_advance(InputIt& it, typename iterator_traits<InputIt>::difference_type n)
{
it += n;
}
template<class It>
BOOST_INTRUSIVE_FORCEINLINE
void iterator_uadvance(It& it, typename iterator_traits<It>::size_type n)