Re: How can i force my derivers to call a base function

"Alf P. Steinbach" <>
Wed, 19 Dec 2007 09:18:40 +0100
* ManicQin:

Hi lets say I have the next situation
class base
pubic: ;)
  base() {}
  virtual ~base(){}
  virtual init()
    {//do init }

now i want that every deriver will call MY init function before he
init his class...
for some reasons I cannot put those calls in the cTor...

one thing that I thought of is
class base
          //do base's init
      virtual secondPahseInit() = 0;

and then the deriver can only override secondPhaseInit and he needs to
go through my init .
But it's still not an idiot proof method... is there a way?

Your question is extremely unclear.

If it's just about how to achieve two-phase construction, the best is
probably to read up on class invariants in order to understand why that
is a generally a Bad Idea.

Otherwise, have a look at the FAQ, e.g. <url:>.

Cheers, & hth.,

- Alf

A: Because it messes up the order in which people normally read text.
Q: Why is it such a bad thing?
A: Top-posting.
Q: What is the most annoying thing on usenet and in e-mail?

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