Operator overloading for a set in c++

Question

So I've created a new class called Tuples where Tuples takes in a vector of strings known as tupleVector. I then create a set of Tuples, meaning I need to overload the operators necessary to order elements and disallow duplicates.

Two questions:

1. which operator overload is necessary? Do I overload < or ==?

2. Assuming I must perform this overload within my Tuples class (so I can use the set of Tuples in other classes), is the following code correct?

   include "Tuples.h"
   Tuples::Tuples(vector<string> tuple){
       tupleVector = tuple;
   }
   vector<string> Tuples::getStrings()
   {
       return tupleVector;
   }
   bool Tuples::operator<(Tuples& other){
       return this->tupleVector<other.tupleVector;
   }
   bool Tuples::operator==(const Tuples& other)const{
       return this->tupleVector==other.tupleVector;
   }
   Tuples::~Tuples() {
       // TODO Auto-generated destructor stub
   }
   

Answer 1

You only need to provide operator<. The container checks whether two items are equivalent by comparing them reflexively: they are equivalent if !(a<b) && !(b<a)