CODEWITHSUNDEEP
c++variadic-templatesvariadic-functionsvariadic
Silverlan
Silverlan

Reputation: 2911

Forward a specific range of arguments in a variadic function

Is there a way to std::forward a specific range of arguments in a variadic function? For example:

#include <iostream>

template<typename T>
    void test_simple(T v0,T v1)
{
    std::cout<<v0<<","<<v1<<std::endl;
}

template<typename... TARGS>
    void test_variadic(TARGS ...args)
{
    test_simple(std::forward<TARGS>(args)...); // Forward all arguments except for the first one?
}

int main(int argc,char *argv[])
{
    test_variadic(5.f,2.f,7.f);
    return EXIT_SUCCESS;
}

I want test_variadic to forward only the last two arguments to test_simple, so that the output would be "2.0,7.0".

Upvotes: 2

Views: 214

Answers (1)

Rakete1111
Rakete1111

Reputation: 48938

Use an additional template parameter:

template <typename T, typename... Ts>
void test_variadic(T&& arg, Ts&&... args) {
    test_simple(std::forward<Ts>(args)...);
}

That way, the first parameter is not part of the variadic.

Upvotes: 5

Related Questions