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74 lines
1.8 KiB
74 lines
1.8 KiB
#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/type_traits/add_const.hpp> |
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# include <boost/type_traits/remove_cv.hpp> |
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# include <boost/mpl/if.hpp> |
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# include <boost/mpl/eval_if.hpp> |
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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 iterator_traits<Iterator>::value_type value_type; |
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struct impl |
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{ |
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template <class T> |
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static char test(T const&); |
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static char (& test(value_type&) )[2]; |
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static Iterator& x; |
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}; |
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BOOST_STATIC_CONSTANT(bool, is_constant = sizeof(impl::test(*impl::x)) == 1); |
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typedef typename mpl::if_c< |
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# if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551)) |
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::boost::detail::iterator_pointee<Iterator>::is_constant |
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# else |
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is_constant |
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# endif |
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, typename 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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