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Is it OK to pass to function a reference to the value of map element, and to modify it there?
foo(string & s) { s = 'xyz'; } map<int, string> m; m[1] = 'abc'; foo(m[1]); // <-- Is it ok? Will m[1] be 'xyz' after this call? Thank you.
The answer is Yes.
(operator [] returns a reference)