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84 lines
2.3 KiB
84 lines
2.3 KiB
// Boost.Range library
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//
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// Copyright Neil Groves 2010. Use, modification and
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// distribution is subject to the Boost Software License, Version
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// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// For more information, see http://www.boost.org/libs/range/
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//
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// Acknowledgments:
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// Ticket #8341: Arno Schoedl - improved handling of has_range_iterator upon
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// use-cases where T was const.
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#ifndef BOOST_RANGE_HAS_ITERATOR_HPP_INCLUDED
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#define BOOST_RANGE_HAS_ITERATOR_HPP_INCLUDED
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#include <boost/mpl/bool.hpp>
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#include <boost/mpl/eval_if.hpp>
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#include <boost/mpl/has_xxx.hpp>
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#include <boost/range/iterator.hpp>
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#include <boost/type_traits/remove_reference.hpp>
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#include <boost/utility/enable_if.hpp>
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namespace boost
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{
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namespace range_detail
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{
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BOOST_MPL_HAS_XXX_TRAIT_DEF(type)
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template<class T, class Enabler = void>
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struct has_range_iterator_impl
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: boost::mpl::false_
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{
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};
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template<class T>
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struct has_range_iterator_impl<
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T,
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BOOST_DEDUCED_TYPENAME ::boost::enable_if<
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BOOST_DEDUCED_TYPENAME mpl::eval_if<is_const<T>,
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has_type<boost::range_const_iterator<
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BOOST_DEDUCED_TYPENAME remove_const<T>::type> >,
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has_type<boost::range_mutable_iterator<T> >
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>::type
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>::type
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>
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: boost::mpl::true_
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{
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};
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template<class T, class Enabler = void>
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struct has_range_const_iterator_impl
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: boost::mpl::false_
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{
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};
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template<class T>
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struct has_range_const_iterator_impl<
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T,
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BOOST_DEDUCED_TYPENAME ::boost::enable_if<
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has_type<boost::range_const_iterator<T> >
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>::type
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>
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: boost::mpl::true_
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{
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};
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} // namespace range_detail
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template<class T>
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struct has_range_iterator
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: range_detail::has_range_iterator_impl<
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BOOST_DEDUCED_TYPENAME remove_reference<T>::type>
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{};
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template<class T>
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struct has_range_const_iterator
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: range_detail::has_range_const_iterator_impl<
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BOOST_DEDUCED_TYPENAME remove_reference<T>::type>
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{};
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} // namespace boost
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#endif // include guard
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