(C++) operator+

 

operator+ is the operator for adding.

 

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

 

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const int x = 3 + 4;

 

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

 

 

 

 

 

Example function to overload operator+

 

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#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); }