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std::forward If arg is an lvalue reference, the function returns arg without modifying its type. This is a helper function to allow perfect forwarding of arguments taken as rvalue references to deduced types, preserving any potential move semantics involved.
A variadic function allows you to accept any arbitrary number of arguments in a function.
A function with a parameter that is preceded with a set of ellipses ( ... ) is considered a variadic function. The ellipsis means that the parameter provided can be zero, one, or more values. For the fmt. Println package, it is stating that the parameter a is variadic.
You would do:
template <typename ...Params>
void f(Params&&... params)
{
y(std::forward<Params>(params)...);
}
The ... pretty much says "take what's on the left, and for each template parameter, unpack it accordingly."
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