Checking type of parameter pack using enable_if

Question

Since there is a restriction on allowed non-type variadic templates, I am trying to write a function taking an arbitrary number of doubles using enable_if. In essen

Answer 1

You could use fold expression in c++17 to do the same thing as other answers posted here but without the hassle of creating templates.

#include 

template ),
        void
    >::type
>
constexpr auto foo(T...) noexcept {
        // your code 
}