blob: 00818b7a20ee318a59ca8a8edbff9182a0233047 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
|
#ifndef TYPEASVALUE_SRC_FUNCTION_DETAIL_PLACEHOLDER_H_
#define TYPEASVALUE_SRC_FUNCTION_DETAIL_PLACEHOLDER_H_
#include <type_traits>
#include "list/list.h"
#include "list/operation/nth.h"
#include "list/operation/higher/query.h"
namespace tav {
namespace detail {
struct placeholder_tag { };
template <std::size_t Index>
struct placeholder : placeholder_tag { };
template <typename Type>
using is_placeholder = Eval<std::is_base_of<placeholder_tag, Type>>;
template <typename... Arguments>
using count_placeholders = Count<is_placeholder, List<Arguments...>>;
template <typename, typename Argument>
struct resolve_placeholder {
typedef Argument type;
};
template <
typename Partials,
std::size_t Index
>
struct resolve_placeholder<Partials, placeholder<Index>> {
typedef Nth<Size<Index>, Partials> type;
};
}
}
#endif // TYPEASVALUE_SRC_FUNCTION_DETAIL_PLACEHOLDER_H_
|
