blob: 481eb65205b347a200c0f42e836d66ddc2f46f55 (
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
|
#ifndef MAPBOX_UTIL_VARIANT_VISITOR_HPP
#define MAPBOX_UTIL_VARIANT_VISITOR_HPP
namespace mapbox {
namespace util {
template <typename... Fns>
struct visitor;
template <typename Fn>
struct visitor<Fn> : Fn
{
using type = Fn;
using Fn::operator();
visitor(Fn fn) : Fn(fn) {}
};
template <typename Fn, typename... Fns>
struct visitor<Fn, Fns...> : Fn, visitor<Fns...>
{
using type = visitor;
using Fn::operator();
using visitor<Fns...>::operator();
visitor(Fn fn, Fns... fns) : Fn(fn), visitor<Fns...>(fns...) {}
};
template <typename... Fns>
visitor<Fns...> make_visitor(Fns... fns)
{
return visitor<Fns...>(fns...);
}
} // namespace util
} // namespace mapbox
#endif // MAPBOX_UTIL_VARIANT_VISITOR_HPP
|
