[K42-discussion] virtual destructors

[Bryan S Rosenburg]

We usually just declare the virtual destructor inline in the class 
declaration.  For example, in class BaseObj (lib/libc/cobj/BaseObj.H) we 
have:

    virtual ~BaseObj() { /* empty body */ }

I don't know if that will get rid of your mysterious undefined symbol, but 
I'd give it a try.

- Bryan




Donour Sizemore <donour at cs.unm.edu> 
Sent by: k42-discussion-bounces+rosnbrg=us.ibm.com at ozlabs.org
07/06/2006 04:15 PM
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[K42-discussion] virtual destructors






C++ requires that classes with virtual methods define a virtual 
destructor. Older versions of gcc allow you to get away without it, but 
gcc4 enforces it. I'm having trouble adding a destructor to the 
VAllocServices class. I want to declare a destructor like this:

VAllocServices{

public:

  ...

  ~VAllocServices() = 0;

}

I've read several places that even with a pure virtual destructor, you 
need to define a body for it. Such as:

VAllocServices::~VAllocServices() {}


When compiling the above example, a strange symbol is being referenced 
(_ZdlPv) but isn't defined and I can't figure out what it is or where it 
comes from. It doesn't appear to be a mangled version of anything I 
recognize. Does anybody have an idea what could be happening here?

thanks

donour
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