forked from boostorg/fusion
94 lines
2.0 KiB
C++
94 lines
2.0 KiB
C++
/*=============================================================================
|
|
Copyright (c) 2001-2006 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_LOOKUP_KEY_09162005_1111)
|
|
#define FUSION_LOOKUP_KEY_09162005_1111
|
|
|
|
#include <boost/mpl/int.hpp>
|
|
#include <boost/type_traits/add_const.hpp>
|
|
#include <boost/type_traits/add_reference.hpp>
|
|
#include <boost/fusion/support/detail/unknown_key.hpp>
|
|
|
|
namespace boost { namespace fusion
|
|
{
|
|
struct void_;
|
|
}}
|
|
|
|
namespace boost { namespace fusion { namespace detail
|
|
{
|
|
template <typename T>
|
|
struct set_data_type
|
|
{
|
|
typedef typename add_reference<T>::type type;
|
|
};
|
|
|
|
template <>
|
|
struct set_data_type<void_>
|
|
{
|
|
typedef void_& type;
|
|
};
|
|
|
|
template <typename T>
|
|
struct set_const_data_type
|
|
{
|
|
typedef typename
|
|
add_reference<
|
|
typename add_const<T>::type
|
|
>::type
|
|
type;
|
|
};
|
|
|
|
template <>
|
|
struct set_const_data_type<void_>
|
|
{
|
|
typedef void_ const& type;
|
|
};
|
|
|
|
template <typename T>
|
|
struct set_value_type
|
|
{
|
|
typedef T type;
|
|
};
|
|
|
|
template <>
|
|
struct set_value_type<void_>
|
|
{
|
|
typedef void_ type;
|
|
};
|
|
|
|
template <typename T, int index>
|
|
struct set_key_type
|
|
{
|
|
typedef T type;
|
|
};
|
|
|
|
template <int index>
|
|
struct set_key_type<void_, index>
|
|
{
|
|
typedef unknown_key<index> type;
|
|
};
|
|
|
|
template <int index, typename RT, typename Key, typename Vector>
|
|
struct set_lookup_key
|
|
{
|
|
static RT
|
|
call(Vector& vec)
|
|
{
|
|
return vec.at_impl(mpl::int_<index>());
|
|
}
|
|
};
|
|
|
|
template <int index, typename Vector>
|
|
struct set_lookup_key<index, void_&, unknown_key<index>, Vector>
|
|
{
|
|
static void_&
|
|
call(Vector& vec); // intentionally undefined
|
|
};
|
|
}}}
|
|
|
|
#endif
|
|
|