mirror of https://github.com/procxx/kepka.git
44 lines
946 B
C++
44 lines
946 B
C++
#ifndef MAPBOX_UTIL_VARIANT_VISITOR_HPP
|
|
#define MAPBOX_UTIL_VARIANT_VISITOR_HPP
|
|
|
|
#include <utility>
|
|
|
|
namespace mapbox {
|
|
namespace util {
|
|
|
|
template <typename... Fns>
|
|
struct visitor;
|
|
|
|
template <typename Fn>
|
|
struct visitor<Fn> : Fn
|
|
{
|
|
using Fn::operator();
|
|
|
|
template<typename T>
|
|
visitor(T&& fn) : Fn(std::forward<T>(fn)) {}
|
|
};
|
|
|
|
template <typename Fn, typename... Fns>
|
|
struct visitor<Fn, Fns...> : Fn, visitor<Fns...>
|
|
{
|
|
using Fn::operator();
|
|
using visitor<Fns...>::operator();
|
|
|
|
template<typename T, typename... Ts>
|
|
visitor(T&& fn, Ts&&... fns)
|
|
: Fn(std::forward<T>(fn))
|
|
, visitor<Fns...>(std::forward<Ts>(fns)...) {}
|
|
};
|
|
|
|
template <typename... Fns>
|
|
visitor<typename std::decay<Fns>::type...> make_visitor(Fns&&... fns)
|
|
{
|
|
return visitor<typename std::decay<Fns>::type...>
|
|
(std::forward<Fns>(fns)...);
|
|
}
|
|
|
|
} // namespace util
|
|
} // namespace mapbox
|
|
|
|
#endif // MAPBOX_UTIL_VARIANT_VISITOR_HPP
|