C++在std :: unordered_map中设置std :: tuple值

Question

我有一个带有字符串键的无序映射和一个包含三个字符串和一个int的元组.如何访问单个元组来设置它们.

鉴于:

std::unordered_map<string,std::tuple<string, string, string,int>> foo_data_by_username;

如何设置say的单个元组值 foo_data_by_username[some_user];

Answer 1

std::get<0>(foo_data_by_username[some_user]) = "new string";

哪个0是您感兴趣的元组索引.