Thinking about the C + + overloaded operator

Thinking about the C + + overloaded operator

#include <iostream>using namespace std;class Imaginary{public:  Imaginary():real(0), imag(0){    cout << "c:" << this << endl;  }  Imaginary(int real, int imag):real(real), imag(imag){    cout << "c:" << this << endl;  }  Imaginary operator+ (const Imaginary &m){    return Imaginary (real + m.real, imag + m.imag);  }  ~Imaginary(){    cout << this << endl;  }private:  int real;  int imag;};int main(){  Imaginary m1(10, 20);  Imaginary m2(1, 2);  Imaginary m3;  printf("m3 : %p\n",&m3);  m3 = m1 + m2;  cout << 1 << endl;  return 0;}

Execution Result:

Analysis: Execute m3 = m1 + m2 point in time, because the M3 space has been created, so immediatelyReleased the object created in operator+, printed 1 out, and finally released the remaining 3 objects. If the code is changed to: imaginary M3 = m1 + m2; Because M3 has not been created yet, the objects created in operator+ are not released.

Thinking about the C + + overloaded operator