514d48903b
[SVN r58549]
43 lines
1.0 KiB
C++
43 lines
1.0 KiB
C++
/*=============================================================================
|
|
Copyright (c) 2009 Christopher Schmidt
|
|
|
|
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)
|
|
==============================================================================*/
|
|
|
|
#ifndef BOOST_FUSION_EXAMPLE_EXTENSION_DETAIL_KEY_OF_IMPL_HPP
|
|
#define BOOST_FUSION_EXAMPLE_EXTENSION_DETAIL_KEY_OF_IMPL_HPP
|
|
|
|
#include <boost/mpl/if.hpp>
|
|
|
|
namespace fields
|
|
{
|
|
struct name;
|
|
struct age;
|
|
}
|
|
|
|
namespace example
|
|
{
|
|
struct example_struct_iterator_tag;
|
|
}
|
|
|
|
namespace boost { namespace fusion {
|
|
|
|
namespace extension
|
|
{
|
|
template<typename Tag>
|
|
struct key_of_impl;
|
|
|
|
template<>
|
|
struct key_of_impl<example::example_struct_iterator_tag>
|
|
{
|
|
template<typename It>
|
|
struct apply
|
|
: mpl::if_c<!It::index::value, fields::name, fields::age>
|
|
{};
|
|
};
|
|
}
|
|
}}
|
|
|
|
#endif
|