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/*=============================================================================
Copyright (c) 2001-2011 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/config.hpp>
#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;
BOOST_FUSION_GPU_ENABLED
static T const&
call(T const& x, mpl::true_)
{
return x;
}
BOOST_FUSION_GPU_ENABLED
static mpl_iterator<T>
call(T const& /*x*/, mpl::false_)
{
return mpl_iterator<T>();
}
BOOST_FUSION_GPU_ENABLED
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
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