[TOC] ## 元組 關于元組的使用有三個核心的函數： 1. `std::make_tuple`: 構造元組 2. `std::get`: 獲得元組某個位置的值 3. `std::tie`: 元組拆包 ## 示例 ``` map<string, tuple<int, int, string>> student; student["a"] = make_tuple(1, 1, "aaa"); student["c"] = make_tuple(2, 2, "bbb"); for (auto [key,val] : student) { auto [i1, i2, s1] = val; cout << key << ":" << i1 << " " << i2 << " " << s1 << "\n"; } // output: // a:1 1 aaa // c:2 2 bbb ```