Is it possible to use 'enable_if' and 'is_same' with variadic function templates?

Question

These two non-variadic function templates do compile:

template 
typename std::enable_if::value, v         


        

Answer 1

Or you could simply make use of additional variadic pack to test if all template arguments are the same and equal to a given type (C++11):

#include 
#include 

template 
struct pack { };

template 
typename std::enable_if, pack>::value, void>::
type testFunction(T a, U... bs) {
    std::cout << "bs are integers\n";
}

template 
typename std::enable_if, pack>::value, void>::
type testFunction(T a, U... bs) {
    std::cout << "bs are floats\n";
}

int main() {
    testFunction(1, 2, 3, 4, 5);
    testFunction(1, 2.0f, 3.5f, 4.4f, 5.3f);
}

[live demo]

Output:

bs are integers
bs are floats