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58 lines
1.4 KiB
C++
58 lines
1.4 KiB
C++
#ifndef POINTEE_DWA200415_HPP
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#define POINTEE_DWA200415_HPP
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//
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// Copyright David Abrahams 2004. Use, modification and distribution is
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// subject to the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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// typename pointee<P>::type provides the pointee type of P.
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//
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// For example, it is T for T* and X for shared_ptr<X>.
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//
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// http://www.boost.org/libs/iterator/doc/pointee.html
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//
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#include <boost/detail/is_incrementable.hpp>
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#include <boost/iterator/iterator_traits.hpp>
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#include <iterator>
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#include <type_traits>
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namespace boost {
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namespace detail {
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template< typename P >
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struct smart_ptr_pointee
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{
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using type = typename P::element_type;
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};
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template< typename Iterator, typename = typename std::remove_reference<decltype(*std::declval<Iterator&>())>::type >
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struct iterator_pointee
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{
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using type = typename std::iterator_traits<Iterator>::value_type;
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};
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template< typename Iterator, typename Reference >
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struct iterator_pointee< Iterator, const Reference >
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{
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using type = typename std::add_const<typename std::iterator_traits<Iterator>::value_type>::type;
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};
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} // namespace detail
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template< typename P >
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struct pointee :
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public std::conditional<
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detail::is_incrementable<P>::value,
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detail::iterator_pointee<P>,
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detail::smart_ptr_pointee<P>
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>::type
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{
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};
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} // namespace boost
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#endif // POINTEE_DWA200415_HPP
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