Re: using C++ with Cocoa
Re: using C++ with Cocoa
- Subject: Re: using C++ with Cocoa
- From: Oscar Morales Vivo <email@hidden>
- Date: Thu, 24 May 2007 11:20:46 -0400
It's a warning you can safely ignore if you know what you're doing.
If you just want to kill the warnings and you're not going to use all
those 'magic' methods, something like the following would be advised
in your C++ class:
class MyCPPClass
{
public:
[...]
protected:
[...]
private:
MyObjCClass* ObjCDataMember;
// Undefined methods.
MyCPPClass(const MyCPPClass&);
MyCPPClass& operator=(const MyCPPClass&);
};
Don't define them (the linker won't complain since it's a sanctioned
technique for specifying that you want no stinking copy constructor or
assignment operator for your class).
You probably can find more information about this technique elsewhere,
it's pretty common and certainly not unique to dealing with Obj-C++.
On May 24, 2007, at 9:25 AM, Frank Weinstock wrote:
I have a Cocoa project going and, for various reasons, need to add a
number of C++ class (and I'm a newbie with C++). Those classes need
to refer to Cocoa objects, which of course come in the form of
pointers. But when I use pointers as data members in C++, Xcode
gives me the warning (actually 3 warnings): "class ClassName has
pointer data members but does not override 'ClassName(const
ClassName&)' or 'operator= (const ClassName&)' " (where ClassName
is, of course, the class I am defining). I know how to override
ClassName(const ClassName&), but I have no idea how to override
operator= (const ClassName&)', or what that even means in this
context.
I know the whole thing could be avoided by using C++ references
instead of pointers, but in this case I can't do that because the
data is not available when the class is first created. Also, I know
that warnings are not the end of the world, but I'd rather get rid
of them if possible...
Thanks for any ideas!
Best,
Frank
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