Understanding SIGSEGV issues

[Russel Winder]

On Sat, 2019-01-05 at 10:31 +0000, Nicholas Wilson via Digitalmars-d-learn
wrote:
[…]
> 
> Maybe it is a problem with copying a File_Ptr (e.g. missing a 
> increase of the reference count)? Like, `auto a = File_Ptr(); { 
> auto b = a; }` and b calls the destructor on scope exit.
> That would be consistent with having problems copying to object 
> to pass to writeln.

I found the problem and then two minutes later read your email and bingo we
have found the problem.

Previously I had used File_Ptr* and on this occasion I was using File_Ptr and
there was no copy constructor because I have @disable this(this). Except that
clearly copying a value is not copying a value in this case. Clearly this
situation is what is causing the destructor to be called on an unconstructed
value. But I have no idea why.

The question now, of course, is should I have been using File_Ptr instead of
File_Ptr* in the first place. I am beginning to think I should have been. More
thinking needed.

-- 
Russel.
===========================================
Dr Russel Winder      t: +44 20 7585 2200
41 Buckmaster Road    m: +44 7770 465 077
London SW11 1EN, UK   w: www.russel.org.uk

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