Re: How to void delete pointer by user

From:

Bart van Ingen Schenau <bart@ingen.ddns.info>

Newsgroups:

comp.lang.c++.moderated

Date:

Sat, 27 Dec 2008 14:45:53 CST

Message-ID:

<49221755.A2HMDjgkKJ@ingen.ddns.info>

zade wrote:

Hi,all
I want a special pointer in my system long live until the system
shutdown. So the user can not delete it.

You can declare the destructor as private or protected.

codes like below:

SpecialPointer* sp =......;

//user maybe do these
delete sp;//user call
delete sp;//user call

These are invalid when the destructor is private/protected.

// but user can use it later;
sp->mem_func();//user call

//until I delete it really

real_delete(sp) // system call

If this function is a member or a friend, then it can trigger the
destruction of sp.
As a member, it would be something like:
  void SpecialPointer::destroy()
  {
    delete this;
  }

As Singleton objects often have the same problem of having to live right
up to the end of the program, it might be worth the effort to research
the techniques that are used there.

Bart v Ingen Schenau
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