BTW, raising an NSException inside a C++
try{}
catch(...){}
block also seems to work OK. It does get caught.
Casey McDermott
--------------------------------------------
On Sat, 6/16/18, Alastair Houghton <alast...@alastairs-place.net> wrote:
Subject: Re: Exception handling
To: "Jens Alfke" <j...@mooseyard.com>
Cc: "Quincey Morris" <quinceymor...@rivergatesoftware.com>, "Casey McDermott"
<supp...@turtlesoft.com>, "cocoa-dev list" <cocoa-dev@lists.apple.com>
Date: Saturday, June 16, 2018, 10:25 AM
On 15 Jun 2018, at 19:30, Jens
Alfke <j...@mooseyard.com>
wrote:
>
>> On Jun 14, 2018,
at 5:58 PM, Quincey Morris <quinceymor...@rivergatesoftware.com>
wrote:
>>
>> as
someone already mentioned, NSExceptions can’t successfully
cross dylib/framework boundaries.
>
> They can, actually; there is no problem
with this at the ABI/runtime level.
>
> I think what you mean is that most
libraries/frameworks don't make guarantees about
properly handling exceptions thrown into them, i.e. from a
call into external code. Some C++ libraries do guarantee
this (especially libc++), and even without guarantees a
typical C++ lib using RAII will be relatively safe, but
Objective-C code usually isn't written to be
exception-safe, and C code of course can't be.
Quite, though in principle
there’s no reason C code couldn’t be exception safe,
it’s just that there’s no language support for it
(except on Windows where there are extensions to support
SEH), so the C code would have to know about the relevant
runtime data structures and associated behaviour. In
practice, it’s very unlikely you’d ever find
exception-safe C code, except in a language runtime or -
rarely - on Windows when it’s been written to use SEH.
Kind regards,
Alastair.
--
http://alastairs-place.net
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