forked from boostorg/fusion
39 lines
1.1 KiB
C++
39 lines
1.1 KiB
C++
/*=============================================================================
|
|
Copyright (c) 2001-2006 Joel de Guzman
|
|
Copyright (c) 2006 Dan Marsden
|
|
|
|
Use, modification and distribution is subject to 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_VALUE_AT_KEY_05052005_0229)
|
|
#define FUSION_VALUE_AT_KEY_05052005_0229
|
|
|
|
#include <boost/mpl/int.hpp>
|
|
#include <boost/fusion/support/tag_of.hpp>
|
|
|
|
namespace boost { namespace fusion
|
|
{
|
|
namespace extension
|
|
{
|
|
template <typename Tag>
|
|
struct value_at_key_impl
|
|
{
|
|
template <typename Sequence, typename N>
|
|
struct apply;
|
|
};
|
|
}
|
|
|
|
namespace result_of
|
|
{
|
|
template <typename Sequence, typename N>
|
|
struct value_at_key
|
|
: extension::value_at_key_impl<typename detail::tag_of<Sequence>::type>::
|
|
template apply<Sequence, N>
|
|
{};
|
|
}
|
|
}}
|
|
|
|
#endif
|
|
|