Hello i'm trying to create a function which will make a call to function provided as a parameter with some provided arguments and return its value, my current approach is as follows
#include <functional>
#include <iostream>
#include <type_traits>
template <typename Res,typename... T>
auto func(typename std::common_type<std::function<Res(T...)>>::type f, T... values) -> decltype(f(values...)) {
f(values...);
}
int fx(int x,int y){return x+y; }
int main() {
>> func([](int x, int y, int z) { std::cout << (x*y*z) << std::endl; }, 3, 6, 8);
return 0;
}
if i replace Res with void and remove the auto&&decltype it works, but somehow i'm not able to get the proper return type.
Best and simplest way is to accept any functor, not just std::function:
template <typename F,typename... T>
auto func(F f, T... values) -> decltype(f(values...)) {
return f(values...);
}
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