std::tuple

https://www.cnblogs.com/Galesaur-wcy/p/15589983.html

因此，基本上 std::make_tuple 有助于自动推导元组类型。

#include 
#include 
#include 
int main()
{
    // Creating and Initializing a tuple
    std::tuple result1 { 22, 19.28, "text" };
    // Compile error, as no way to deduce the types of elements in tuple
    //auto result { 22, 19.28, "text" }; // Compile error
    // Creating a tuple using std::make_tuple
    auto result2 = std::make_tuple( 7, 9.8, "text" );
    // std::make_tuple automatically deduced the type and created tuple
    // Print values
    std::cout << "int value = " << std::get < 0 > (result2) << std::endl;
    std::cout << "double value = " << std::get < 1 > (result2) << std::endl;
    std::cout << "string value = " << std::get < 2 > (result2) << std::endl;
    return 0;
}