How to fix my variadic function (constructor) implementation that is in a class template?

Question

Please help me fix this.
https://code.sololearn.com/cnwvvfBgWab6/?ref=app

Answer 1

https://code.sololearn.com/c7Jw4Bcb1RRA/?ref=app

If statements with initializer -> https://en.cppreference.com/w/cpp/language/if#If_statements_with_initializer
common_type -> https://en.cppreference.com/w/cpp/types/common_type

Answer 2

https://code.sololearn.com/c7Jw4Bcb1RRA/?ref=app

Answer 3

MO ELomari Great . Thanks a lot.

Answer 4

you're welcome

Answer 5

MO ELomari can you DM me or resend your first link again? I don't know, Sololearn sometimes doesn't work, I tap on the first link but nothing happens.

Answer 6

MO ELomari thank you. I think you saw my comment : other functions may not be variadic. But you used a variadic template for the class. Can I use non variadic templates for non variadic functions?
i.e.
template<typename T>
void A<T>::func()
{
// some code
}