| /*============================================================================= | |
| Copyright (c) 2001-2006 Joel de Guzman | |
| Distributed under the Boost Software License, Version 1.0. (See accompanying | |
| file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
| ==============================================================================*/ | |
| #if !defined(FUSION_CONVERT_ITERATOR_05062005_1218) | |
| #define FUSION_CONVERT_ITERATOR_05062005_1218 | |
| #include <boost/fusion/support/is_iterator.hpp> | |
| #include <boost/mpl/if.hpp> | |
| #include <boost/mpl/bool.hpp> | |
| namespace boost { namespace fusion | |
| { | |
| template <typename Iterator> | |
| struct mpl_iterator; // forward declaration | |
| // Test T. If it is a fusion iterator, return a reference to it. | |
| // else, assume it is an mpl iterator. | |
| template <typename T> | |
| struct convert_iterator | |
| { | |
| typedef typename | |
| mpl::if_< | |
| is_fusion_iterator<T> | |
| , T | |
| , mpl_iterator<T> | |
| >::type | |
| type; | |
| static T const& | |
| call(T const& x, mpl::true_) | |
| { | |
| return x; | |
| } | |
| static mpl_iterator<T> | |
| call(T const& /*x*/, mpl::false_) | |
| { | |
| return mpl_iterator<T>(); | |
| } | |
| static typename | |
| mpl::if_< | |
| is_fusion_iterator<T> | |
| , T const& | |
| , mpl_iterator<T> | |
| >::type | |
| call(T const& x) | |
| { | |
| return call(x, is_fusion_iterator<T>()); | |
| } | |
| }; | |
| }} | |
| #endif |