C++ map详解

    map<string, int> m1;
    m1["def"] = 2;

    map<string, int> m2;
    m2.insert({ "abc", 1 });    //使用这种就可以了
    //其他形式和方式
    m2.insert(make_pair(string("def"), 2));
    m2.insert(pair<string, int>(string("ghi"), 3));
    map<int, string> mapStudent;
    mapStudent.insert(map<int, string>::value_type (1,"student_one"));

    map<string,int> m3 = {
    {"string",1}, {"sec",2}, {"trd",3}
    };
    map<string,string> m4 = {
    {"first","second"}, {"third","fourth"},
    {"fifth","sixth"}, {"begin","end"}
    };

map<string,int> a;    //a是string到int的空map
a["new"];             //"new"是新增的key