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Modernized iterator_traits.hpp.

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Added *_t type traits and removed an oudated macro that was used with
ancient compilers.
This commit is contained in:
Andrey Semashev 2025-02-05 00:24:07 +03:00
parent 6e60ea7a88
commit baf6d06cc2
1 changed files with 24 additions and 17 deletions
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41
include/boost/iterator/iterator_traits.hpp
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@ -3,49 +3,56 @@
// accompanying file LICENSE_1_0.txt or copy at // accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt) // http://www.boost.org/LICENSE_1_0.txt)
#ifndef ITERATOR_TRAITS_DWA200347_HPP #ifndef ITERATOR_TRAITS_DWA200347_HPP
# define ITERATOR_TRAITS_DWA200347_HPP #define ITERATOR_TRAITS_DWA200347_HPP
# include <boost/detail/workaround.hpp>
#include <iterator> #include <iterator>
namespace boost { namespace boost {
namespace iterators { namespace iterators {
// Macro for supporting old compilers, no longer needed but kept template< typename Iterator >
// for backwards compatibility (it was documented). using iterator_value_t = typename std::iterator_traits< Iterator >::value_type;
#define BOOST_ITERATOR_CATEGORY iterator_category
template< typename Iterator >
template <class Iterator>
struct iterator_value struct iterator_value
{ {
typedef typename std::iterator_traits<Iterator>::value_type type; using type = iterator_value_t< Iterator >;
}; };
template <class Iterator> template< typename Iterator >
using iterator_reference_t = typename std::iterator_traits< Iterator >::reference;
template< typename Iterator >
struct iterator_reference struct iterator_reference
{ {
typedef typename std::iterator_traits<Iterator>::reference type; using type = iterator_reference_t< Iterator >;
}; };
template< typename Iterator >
using iterator_pointer_t = typename std::iterator_traits< Iterator >::pointer;
template <class Iterator> template< typename Iterator >
struct iterator_pointer struct iterator_pointer
{ {
typedef typename std::iterator_traits<Iterator>::pointer type; using type = iterator_pointer_t< Iterator >;
}; };
template <class Iterator> template< typename Iterator >
using iterator_difference_t = typename std::iterator_traits< Iterator >::difference_type;
template< typename Iterator >
struct iterator_difference struct iterator_difference
{ {
typedef typename std::iterator_traits<Iterator>::difference_type type; using type = iterator_difference_t< Iterator >;
}; };
template <class Iterator> template< typename Iterator >
using iterator_category_t = typename std::iterator_traits< Iterator >::iterator_category;
template< typename Iterator >
struct iterator_category struct iterator_category
{ {
typedef typename std::iterator_traits<Iterator>::iterator_category type; using type = iterator_category_t< Iterator >;
}; };
} // namespace iterators } // namespace iterators