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Atmosphere/stratosphere/libstratosphere/include/meta_tools.hpp

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#pragma once
#include <functional>
namespace detail {
template<typename T>
struct class_of;
template<typename Ret, typename C>
struct class_of<Ret C::*> {
using type = C;
};
template<typename T>
using class_of_t = typename class_of<T>::type;
template<typename Mem, typename T, typename C = class_of_t<Mem>>
struct member_equals_fn_helper {
T ref;
Mem mem_fn;
bool operator()(const C& val) const {
return (std::mem_fn(mem_fn)(val) == ref);
}
bool operator()(C&& val) const {
return (std::mem_fn(mem_fn)(std::move(val)) == ref);
}
};
} // namespace detail
template<typename Mem, typename T>
auto member_equals_fn(Mem mem, T ref) {
return detail::member_equals_fn_helper<Mem, T>{std::move(ref), std::move(mem)};
}