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47 lines
1.1 KiB
47 lines
1.1 KiB
// Copyright Daniel Wallin 2006. 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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#ifndef BOOST_PARAMETER_TEMPLATE_KEYWORD_060203_HPP |
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# define BOOST_PARAMETER_TEMPLATE_KEYWORD_060203_HPP |
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# include <boost/mpl/and.hpp> |
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# include <boost/mpl/not.hpp> |
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# include <boost/type_traits/is_convertible.hpp> |
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# include <boost/type_traits/is_reference.hpp> |
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namespace boost { namespace parameter { |
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namespace aux |
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{ |
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struct template_keyword_tag {}; |
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template <class T, class U> |
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struct is_pointer_convertible |
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: is_convertible<T*, U*> |
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{}; |
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template <class T> |
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struct is_template_keyword |
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: mpl::and_< |
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mpl::not_<is_reference<T> > |
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, is_pointer_convertible<T, template_keyword_tag> |
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> |
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{}; |
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} // namespace aux |
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template <class Tag, class T> |
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struct template_keyword |
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: aux::template_keyword_tag |
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{ |
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typedef Tag key_type; |
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typedef T value_type; |
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typedef value_type reference; |
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}; |
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}} // namespace boost::parameter |
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#endif // BOOST_PARAMETER_TEMPLATE_KEYWORD_060203_HPP |
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