63 lines
1.8 KiB
Plaintext
63 lines
1.8 KiB
Plaintext
/*=============================================================================
|
|
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_CONSTEXPR BOOST_FUSION_GPU_ENABLED
|
|
static T const&
|
|
call(T const& x, mpl::true_)
|
|
{
|
|
return x;
|
|
}
|
|
|
|
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
|
|
static mpl_iterator<T>
|
|
call(T const& /*x*/, mpl::false_)
|
|
{
|
|
return mpl_iterator<T>();
|
|
}
|
|
|
|
BOOST_CONSTEXPR 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
|