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61 lines
1.4 KiB
C++
61 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 <boost/mpl/eval_if.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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{
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template <class P>
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struct smart_ptr_pointee
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{
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typedef typename P::element_type type;
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};
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template <class Iterator>
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struct iterator_pointee
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{
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typedef typename std::iterator_traits<Iterator>::value_type value_type;
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typedef typename std::conditional<
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std::is_const<
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typename std::remove_reference<decltype(*std::declval<Iterator&>())>::type
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>::value
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, typename std::add_const<value_type>::type
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, value_type
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>::type type;
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};
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}
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template <class P>
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struct pointee
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: mpl::eval_if<
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detail::is_incrementable<P>
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, detail::iterator_pointee<P>
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, detail::smart_ptr_pointee<P>
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>
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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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