Overloading is to redefine a standard operator. The example below shows how to overload operator<<.


#include <iostream>



struct MyClass

{

  MyClass(const int value) : mValue(value) {}

  private:

  const int mValue;

  friend std::ostream& operator<<(std::ostream& os, const MyClass& myClass);

  friend std::ostream& operator<<(std::ostream& os, const MyClass& myClass);

};



std::ostream& operator<<(std::ostream& os, const MyClass& myClass)

{

  os << "MyClass.value: " << myClass.mValue;

  return os;

}



int main()

{

  const MyClass myClass(13);

  std::cout << myClass << '\n';

}

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(C++) Overloading