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Added pointee_t alias.

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This commit is contained in:
Andrey Semashev 2025-02-07 01:26:33 +03:00
parent d35869cd25
commit 8998179e9d
1 changed files with 17 additions and 12 deletions
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29
include/boost/pointee.hpp
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@ -1,5 +1,5 @@
#ifndef POINTEE_DWA200415_HPP #ifndef BOOST_POINTEE_DWA200415_HPP
#define POINTEE_DWA200415_HPP #define BOOST_POINTEE_DWA200415_HPP
// //
// Copyright David Abrahams 2004. Use, modification and distribution is // Copyright David Abrahams 2004. Use, modification and distribution is
@ -13,12 +13,11 @@
// http://www.boost.org/libs/iterator/doc/pointee.html // http://www.boost.org/libs/iterator/doc/pointee.html
// //
#include <boost/detail/is_incrementable.hpp>
#include <boost/iterator/iterator_traits.hpp>
#include <iterator> #include <iterator>
#include <type_traits> #include <type_traits>
#include <boost/detail/is_incrementable.hpp>
namespace boost { namespace boost {
namespace detail { namespace detail {
@ -28,16 +27,19 @@ struct smart_ptr_pointee
using type = typename P::element_type; using type = typename P::element_type;
}; };
template< typename Iterator, typename = typename std::remove_reference<decltype(*std::declval<Iterator&>())>::type > template<
typename Iterator,
typename = typename std::remove_reference< decltype(*std::declval< Iterator& >()) >::type
>
struct iterator_pointee struct iterator_pointee
{ {
using type = typename std::iterator_traits<Iterator>::value_type; using type = typename std::iterator_traits< Iterator >::value_type;
}; };
template< typename Iterator, typename Reference > template< typename Iterator, typename Reference >
struct iterator_pointee< Iterator, const Reference > struct iterator_pointee< Iterator, const Reference >
{ {
using type = typename std::add_const<typename std::iterator_traits<Iterator>::value_type>::type; using type = typename std::add_const< typename std::iterator_traits< Iterator >::value_type >::type;
}; };
} // namespace detail } // namespace detail
@ -45,13 +47,16 @@ struct iterator_pointee< Iterator, const Reference >
template< typename P > template< typename P >
struct pointee : struct pointee :
public std::conditional< public std::conditional<
detail::is_incrementable<P>::value, detail::is_incrementable< P >::value,
detail::iterator_pointee<P>, detail::iterator_pointee< P >,
detail::smart_ptr_pointee<P> detail::smart_ptr_pointee< P >
>::type >::type
{ {
}; };
template< typename P >
using pointee_t = typename pointee< P >::type;
} // namespace boost } // namespace boost
#endif // POINTEE_DWA200415_HPP #endif // BOOST_POINTEE_DWA200415_HPP