Question

hello i am building a template in c++ ,and i need to overwrite the operator “<” inside the template for being able to compare between items inside my data structure.
could anyone please tell me how to overwrite it … should i send a pointer to a function inside the constructor of the template?
I got two templates, the first one is Node template which includes a pointer to the data that i am managing.
and the second is a Heap template which has an vector of nodes*.
in my implementation i should be able to compare between nodes*.

Answer 1

Will this do? I have purposely provided ‘operator <‘ in the namespace scope so that it is more generic, though it is shown in comments how to do so.

template<class T> struct A;

template<class T, class U>     // Remove U and modify accordingly, if f and s
                               // have to be of the same type.
bool operator < (A<T> const &f, A<U> const &s){
   // have the logic here
   return true;
}

template<class T> struct A{
   // template<class U>                // This is how you define inside a class.
   // bool operator < (A<U> const &s){
   //    have logic here
   //    return true;
   // }
};

int main(){
   A<int> a;
   A<double> d;

   bool b = a < d;
}