63 lines
1.8 KiB
Plaintext
63 lines
1.8 KiB
Plaintext
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/*=============================================================================
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Copyright (c) 2001-2011 Joel de Guzman
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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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#if !defined(FUSION_CONVERT_ITERATOR_05062005_1218)
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#define FUSION_CONVERT_ITERATOR_05062005_1218
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#include <boost/fusion/support/config.hpp>
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#include <boost/fusion/support/is_iterator.hpp>
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#include <boost/mpl/if.hpp>
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#include <boost/mpl/bool.hpp>
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namespace boost { namespace fusion
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{
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template <typename Iterator>
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struct mpl_iterator; // forward declaration
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// Test T. If it is a fusion iterator, return a reference to it.
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// else, assume it is an mpl iterator.
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template <typename T>
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struct convert_iterator
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{
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typedef typename
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mpl::if_<
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is_fusion_iterator<T>
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, T
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, mpl_iterator<T>
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>::type
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type;
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static T const&
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call(T const& x, mpl::true_)
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{
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return x;
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}
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static mpl_iterator<T>
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call(T const& /*x*/, mpl::false_)
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{
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return mpl_iterator<T>();
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}
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static typename
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mpl::if_<
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is_fusion_iterator<T>
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, T const&
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, mpl_iterator<T>
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>::type
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call(T const& x)
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{
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return call(x, is_fusion_iterator<T>());
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}
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};
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}}
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#endif
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