Is it possible to get names of template arguments without using macro?

Asked Oct 18 '22 at 10:39

Active Oct 18 '22 at 10:43

Viewed 32 times

I've got a simple macro

#define DESCRIBED(Class, ...) template<>\
struct TypeDescriptor<Class>\
{\
    static constexpr std::string_view memberString{#__VA_ARGS__};\
};\

but I'm wondering if there is a way to not use macro

something like this:

template<typename T, typename ... Args>
struct TypeDescriptor
{
    static constexpr std::string_view memberString{ /* some magic to cast args to string */ Args...};
};

is it possible?

I've seen C++ Get name of type in template but typeid(T).name() is not constexpr, so I cannot use static constexpr std::string_view

edited Oct 18 '22 at 10:43

asked Oct 18 '22 at 10:39

Edziju

Short answer: no it's not. – Sam Varshavchik Oct 18 '22 at 10:58
See this answer in the duplicate: https://stackoverflow.com/a/59522794 – HolyBlackCat Oct 18 '22 at 10:58
@SamVarshavchik Thanks, that's all I needed to know – Edziju Oct 18 '22 at 11:00
Nah, it is possible. – HolyBlackCat Oct 18 '22 at 11:00
@florestan alright, I gotta read about it. I see it's constexpr so it may be what I need – Edziju Oct 18 '22 at 13:15
@Edziju I've added an answer in the linked discussion, as this one here is closed, https://stackoverflow.com/a/74111449/8494588 – florestan Oct 18 '22 at 13:18
@florestan Uh, what not correct? My link uses the same trick, but with `__PRETTY_FUNCTION__`/`__FUNCSIG__` (which work basically everywhere). – HolyBlackCat Oct 18 '22 at 13:50
@HolyBlackCat, ahh, sorry, I meant your other comment :Nah, it is possible." which I misread as "is not possible", sorry, I just realised this now. Nothing is wrong with your answer, except that the question was about how to do it without macro. – florestan Oct 18 '22 at 14:36
@florestan None of those are macros, despite being named in all caps. The only macro in that answer is `#ifdef _MSC_VER`. – HolyBlackCat Oct 18 '22 at 14:45
1

@HolyBlackCat Oh, cool, I didn't know that. I always thought they were macros. Learning c++ seems to be a never ending adventure :) – florestan Oct 18 '22 at 14:55

Is it possible to get names of template arguments without using macro?

0 Answers0