for each support ？

[Another7]

int main()
{
    map<string, int> mymap;
    mymap["surrender"] = 1;
    for (auto [key, value] : mymap)
    {
        cout << key << "---" << value << endl;
    }
    return 0;
}

Can compile successfully but prompt undefined identifier

[Colengms]

Hi @Another7 . I do not get errors with the following code:

#include <iostream>
#include <string>
#include <map>

using namespace std;

int main()
{
    map<string, int> mymap;
    mymap["surrender"] = 1;
    for (auto [key, value] : mymap)
    {
        cout << key << "---" << value << endl;
    }
    return 0;
}

I suspect you will need to provide a cppStandard setting of c++17 or c++20, for this code to be considered valid. If you have not set cppStandard, it would be the default used by the specified or detected compiler, which likely is not c++17 or c++20.

[Another7]

Got it, Sorry for this question and thanks for you.