[K42-discussion] virtual destructors

[Donour Sizemore]

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