Variadic Template的一个例子

//main.cpp
#include 
#include 
#include 

template
void print(const T& ... args)
{
    (void)std::initializer_list{ (std::cout << args << ' ', 0)... };
    std::cout << '\n';
}

template
auto sum(const T& ... args)
{
    using T_t = std::common_type_t;
    auto arg_list = {args...};
    return std::accumulate(std::begin(arg_list), std::end(arg_list), 0, std::plus());
}

int main()
{
    print("1", 2, 3.3f);
    print(sum(1, 2, 3));
}

//output
1 2 3.3 
6