How to have a set of structs in C++

Question

I have a struct which has a unique key. I want to insert instances of these structs into a set. I know that to do this the < operator has to be overloaded so that set can mak

Answer 1

The problem isn't in your set; it's in your test object. You're using Java style there. In C++, we just write:

set bar;

int main()
{
    foo test; // Local variable, goes out of scope at }
    test.key = 0;
    bar.insert(test); // Insert _a copy of test_ in bar.
}