Push_back variadic function parameters into a vector?

Question

I am trying to push_back the parameters of a variadic function as shown below, but the compiler says there is a type mismatch (due to the parameters being a general type while the vector is int). What should I do to make the parameters compatible?

vector<int> x;
template<typename... Rest>
void foo(Rest... rest) {
    x.push_back(rest...);
}

Answer 1

In C++14 and before:

void foo(Rest... rest) {
    int a[] = {0, (x.push_back(rest), 0)...};
    static_cast<void>(a);  // unused
}

In C++17:

void foo(Rest... rest) {
    (x.push_back(rest), ...);
}