#include <cstdarg>
#include <iostream>
#include <vector>
 
void SendMsg(int x, std::string format, ...)
{
    va_list vl;
    va_start(vl, format);
    vprintf(format.c_str(), vl);
    va_end(vl);
    std::cout << std::endl;
};
 
template <typename... Ts>
void FOO(int x, const std::string& format, Ts... args)
{
    SendMsg(x, format + "%s %d", args..., "xyz", 123);
}
 
void FOO(int x)
{
    SendMsg(x, "%s %d", "xyz", 123);
}
 
int main()
{
    FOO(42, "prefix %f ", 4.2f);
    FOO(42);
}
 

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