operator+ is the operator for adding.

The following line of code calls operator+ to add the values of two integers:


const int x = 3 + 4;

operator+ is encapsulated by the functor std::plus.

Example function to overload operator+


#include <cassert>

 

struct Test

{

  Test(const int x = 0) : mX(x) {}

  int mX;

};

 

const Test operator+(const Test& lhs, const Test& rhs)

{

  return Test( lhs.mX + rhs.mX );

}

 

int main()

{

  const Test t1(3);

  const Test t2(4);

  const Test t3 = t1 + t2;

  assert(t3.mX == 7);

}

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(C++) operator+

Example function to overload operator+