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To: Rowan Collins <rowan.collins@gmail.com>
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Date: Wed, 28 Oct 2015 23:56:26 +0100
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Subject: Re: [PHP-DEV] In a destructor, how to detect if an exception is
 currently in flight?
From: johannes@schlueters.de (Johannes =?ISO-8859-1?Q?Schl=FCter?=)

On Wed, 2015-10-28 at 16:45 +0000, Rowan Collins wrote:
> On the downside, it's worth noting that while PHP destructors are 
> technically deterministic, the language can actually prevent them 
> running on scope exit, because Exceptions hold references to everything 
> used as a parameter in their stack traces.
> 
> In the below very simple example, both err() and foo() have completed, 
> but the destructor fires only once the Exception is caught and 
> discarded. So if you passed your ScopeGuard object around at all, you 
> might find things executing in a surprising order.

That's an interesting case, I in fact didn't think about, but I believe
a scope guard / RAII object should not be passed to another scope.

johannes