c++ map how to initialize code example

Example 1: how to initialize map in c++

std::map<std::string,std::string> my_map = {
  {"key1","value1"},
  {"key2","value2"}
};

Example 2: initialize map c++

std::map<std::string, int> mapOfMarks = {
		{"Riti",2},
		{"Jack",4}
};