trouble inserting a struct into a set C++

Question

I am working on an A* pathfinding algorithm, but am having trouble with an error I receive when i insert a struct called node into a set. The error reads: \"Error 1 erro

Answer 1

You need to create operator<or specialize std::less for your struct. Another solution could be to use std::array:

struct node : std::array<5,int> {
    int &f() { return data()[0]; }
    int &g() { return data()[1]; }
    int &h() { return data()[2]; }
    int &x() { return data()[3]; }
    int &y() { return data()[4]; }
};

and you will inherit operator< from it. Another benefit - you can access underlying data as array, which would simplify serializing etc.