Does Class template argument deduction works with std::map?

Question

I tried to get CTAD to work with std::map, but I can not get it to work.

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

using namespace std;
using namespace std::string_literals;

int main() {
    std::vector v{1,2,3}; // ok
    std::map m{{4, "four"s},{7,"seven"s},{1,"one"s},{5,"five"s}}; // error
}

Is there a way to make it work, or is std::map to complicated for it to work?

Answer 1

The problem is that this std::map m{{4, "four"s},{7,"seven"s},{1,"one"s},{5,"five"s}}; // error is an {} of {}s, and CTAD doesn't do that.

If you do std::map m{std::pair{4, "four"s},{7,"seven"s},{1,"one"s},{5,"five"s}}; it becomes an initializer list, which CTAD works on.