Is it impossible to use an STL map together with a struct as key?

Question

I have the following code:

struct Node
{
  int a;
  int b;
};

Node node;
node.a = 2;
node.b = 3;

map aa;
aa[1]=1; // OK.

map

        

Answer 1

Could you please post the compiler error - They're intended to tell you, what's wrong.

I guess your error occurs since Node doesn't implement a comparison operator which is required by the map in order to identify it's elements.