[mythtv] regression with 7f00642b

[Jean-Yves Avenard]

The key is that they aren't nullptr. As such, the behaviour isn't undefined. 

As it's called with length set to 0, it is fine. 

Vector::data() is the one you would want to use though. 

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________________________________
From: Gary Buhrmaster
Sent: Friday, 11 May 2018 08:05
To: Development of MythTV
Subject: Re: [mythtv] regression with 7f00642b

On Fri, May 11, 2018 at 8:04 AM, Jean-Yves Avenard <jyavenard at gmail.com> wrote: 
> On 11 May 2018 at 09:53, Jean-Yves Avenard <jyavenard at gmail.com> wrote: 
>> reverse that change and pass &gdesc.front() instead 
>> 
>> (and &pdesc.front()) 
> 
> actually, &*gdesc.begin() may be better. 

My recollection (of the standard) is that if the 
vector is empty, neither begin() nor front() are 
defined and/or can be dereferenced.  And these 
are cases where the vector is empty. 

But I would certainly defer to someone who 
knows the standards better than I. 
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