Re: [Firebird-devel] Reference counters in API - was Re: Providers, yvalve, external engines and object lifecycle

[Dimitry S. <sd...@ib...>]

30.03.2011 12:32, Vlad Khorsun wrote:
>>    There is no difference. Whether pointer was invalid from the beginning or become,
>> result is the same.
>
>      Your example is a crash in *user* code, not in ours.

   Only if called function is virtual and is called via reference to base class. Otherwise 
crash will occur in _your_ code as soon as it try to access any member variable.

>    Reference counting prevents MT races in most cases, it is already used by our code
> internally and allows user to not add additional locking layer for MT safety.

   Ok, here is a code:

Interface* a = new RefCountedClass;
Interface* b = NULL;
b = a;
delete a;
b->Anything();

   I don't understand how reference counting works here. Could you explain?

-- 
   SY, SD.