fn.h

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#ifndef NNGN_UTILS_FN_H
#define NNGN_UTILS_FN_H
 
#include <tuple>
 
#include "types.h"
#include "utils.h"
 
namespace nngn {
 
namespace detail {
 
template<typename T> struct fn_args;
 
template<typename R, typename ...A>
struct fn_args<R(*)(A...)> { using type = types<A...>; };
 
}
 
template<auto f>
using fn_args = typename detail::fn_args<decltype(f)>::type;
 
template<typename T>
struct to {
    constexpr T operator()(auto &&x) const { return static_cast<T>(FWD(x)); }
};
 
template<auto x>
struct constant {
    constexpr auto operator()(auto&&...) const { return x; }
};
 
}
 
#endif