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Class Function Overloading Problem

Started by ms291052 Apr 18, 2004 at 9:23 PM 3 replies 300+ views

Original Post

Apr 18, 2004 at 9:23 PM

Hello, I''m having a problem with overloading. I have a class like this

class Foo
{
void Bar(MyClass* a);
void Bar(DWORD a);
};

All runs fine and dandy, right? Until I get to the point where I call Bar(0), it gives me an ambiguous error. I want to direct that call to the DWORD version, but it doesn''t work. I''ve found I can hack through the problem by calling it like Bar((DWORD)0); but that''s just that: a hack. Is there any decent way of doing this?

SiCrane

Mod

473

SiCrane

Apr 18, 2004 at 9:28 PM

You can add an extra layer of indirection to your function parameter. Like:


class MyClass;

class MyClassPtr {
  public:
    MyClassPtr(MyClass * ptr) : ptr_(ptr) {}
    MyClass * ptr_;
};

class Foo {
  public:
    void Bar(MyClassPtr a);
    void Bar(DWORD a);
};

int main() {
  Foo f;
  MyClass * ptr;
  f.Bar(0);
  f.Bar(ptr);

  return 0;
}

It''s ugly, but it keeps the ugly localized.

ms291052

Author

ms291052

Apr 18, 2004 at 9:55 PM

Hmmm... Thanks for your response. Personally, however, I think that just casting to DWORD''s prettier. Thanks a lot anyway!

JohnBolton

132

JohnBolton

Apr 18, 2004 at 9:56 PM

quote:
Original post by ms291052
... I''ve found I can hack through the problem by calling it like Bar((DWORD)0); but that''s just that: a hack. Is there any decent way of doing this?

Perhaps you could use a reference instead of a pointer. Other than that, "(DWORD)0" is the simplest and most straightforward.

fallenang3l

Apr 18, 2004 at 10:28 PM

You just violated a good design principle: never overload on a numeric type and a pointer (read up Effective C++). Either scrap this design, or hack it with a cast.

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