forked from boostorg/fusion
71 lines
1.8 KiB
C++
71 lines
1.8 KiB
C++
|
/*=============================================================================
|
||
|
|
Copyright (c) 2001-2006 Joel de Guzman
|
||
|
|
Copyright (c) 2005-2006 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(BOOST_FUSION_AT_KEY_IMPL_20060223_2017)
|
||
|
|
#define BOOST_FUSION_AT_KEY_IMPL_20060223_2017
|
||
|
|
|
||
|
|
#include <string>
|
||
|
|
#include <boost/mpl/if.hpp>
|
||
|
|
#include <boost/type_traits/is_const.hpp>
|
||
|
|
|
||
|
|
namespace fields
|
||
|
|
{
|
||
|
|
struct name;
|
||
|
|
struct age;
|
||
|
|
}
|
||
|
|
|
||
|
|
namespace boost { namespace fusion {
|
||
|
|
|
||
|
|
struct example_sequence_tag;
|
||
|
|
|
||
|
|
namespace extension
|
||
|
|
{
|
||
|
|
template<typename Tag>
|
||
|
|
struct at_key_impl;
|
||
|
|
|
||
|
|
template<>
|
||
|
|
struct at_key_impl<example_sequence_tag>
|
||
|
|
{
|
||
|
|
template<typename Sequence, typename Key>
|
||
|
|
struct apply;
|
||
|
|
|
||
|
|
template<typename Sequence>
|
||
|
|
struct apply<Sequence, fields::name>
|
||
|
|
{
|
||
|
|
typedef typename mpl::if_<
|
||
|
|
is_const<Sequence>,
|
||
|
|
std::string const&,
|
||
|
|
std::string&>::type type;
|
||
|
|
|
||
|
|
static type
|
||
|
|
call(Sequence& seq)
|
||
|
|
{
|
||
|
|
return seq.name;
|
||
|
|
};
|
||
|
|
};
|
||
|
|
|
||
|
|
template<typename Sequence>
|
||
|
|
struct apply<Sequence, fields::age>
|
||
|
|
{
|
||
|
|
typedef typename mpl::if_<
|
||
|
|
is_const<Sequence>,
|
||
|
|
int const&,
|
||
|
|
int&>::type type;
|
||
|
|
|
||
|
|
static type
|
||
|
|
call(Sequence& seq)
|
||
|
|
{
|
||
|
|
return seq.age;
|
||
|
|
};
|
||
|
|
};
|
||
|
|
};
|
||
|
|
}
|
||
|
|
}}
|
||
|
|
|
||
|
|
#endif
|