Equals operator c++ overlaod

  MyClass& MyClass::operator=(const MyClass &rhs) {

    // Only do assignment if RHS is a different object from this.
    if (this != &rhs) {
      ... // Deallocate, allocate new space, copy values...
    }

    return *this;
  }

Source: courses.cms.caltech.edu

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Mingw32/bin/ld.exe: C:\Users\mfrom\AppData\Local\Temp\ccSKcRks.o:PizzaPi.cpp:(.text$_ZN5PizzaC2Ev[__ZN5PizzaC2Ev]+0xa): undefined reference to `vtable for Pizza' collect2.exe: error: ld returned 1 exit status
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