forked from boostorg/fusion
fusion: merge of associative iterators/views and the new fold interface
[SVN r58618]
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42
example/extension/detail/key_of_impl.hpp
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42
example/extension/detail/key_of_impl.hpp
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/*=============================================================================
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Copyright (c) 2009 Christopher Schmidt
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Distributed under 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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#ifndef BOOST_FUSION_EXAMPLE_EXTENSION_DETAIL_KEY_OF_IMPL_HPP
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#define BOOST_FUSION_EXAMPLE_EXTENSION_DETAIL_KEY_OF_IMPL_HPP
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#include <boost/mpl/if.hpp>
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namespace fields
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{
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struct name;
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struct age;
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}
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namespace example
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{
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struct example_struct_iterator_tag;
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}
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namespace boost { namespace fusion {
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namespace extension
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{
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template<typename Tag>
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struct key_of_impl;
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template<>
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struct key_of_impl<example::example_struct_iterator_tag>
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{
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template<typename It>
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struct apply
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: mpl::if_c<!It::index::value, fields::name, fields::age>
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{};
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};
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}
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}}
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#endif
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