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 <iostream>
#include <tuple>
#include <string>
int main()
{// Creating and Initializing a tuplestd::tuple<int, double, std::string> 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_tupleauto result2 = std::make_tuple( 7, 9.8, "text" );// std::make_tuple automatically deduced the type and created tuple// Print valuesstd::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;
}