This is the mail archive of the libstdc++@gcc.gnu.org mailing list for the libstdc++ project.

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]
Other format:	[Raw text]

Re: std::string<ThrowOnCopy> behavior

From: Ivan Baravy <i dot baravy at samsung dot com>
To: Tim Song <t dot canens dot cpp at gmail dot com>
Cc: libstdc++ <libstdc++ at gcc dot gnu dot org>
Date: Mon, 17 Apr 2017 15:40:35 +0300
Subject: Re: std::string<ThrowOnCopy> behavior
Authentication-results: sourceware.org; auth=none
Cms-type: 201P
References: <CGME20170414130729eucas1p1ad084f642d2a634d4137c3b89c9d5d8c@eucas1p1.samsung.com> <9fe24e89-20f6-3a7e-9178-5487ea7a6c75@samsung.com> <CAPQZVxuZ91KWYDPui523zaSwtmGY0NZUUAG8wxpBdaO_5y35bQ@mail.gmail.com>

Tim,

thank you for the answer, this helps me a lot.

Regards,
Ivan

On 04/14/2017 10:13 PM, Tim Song wrote:
> On Fri, Apr 14, 2017 at 9:07 AM, Ivan Baravy <i.baravy@samsung.com> wrote:
>> Hello,
>>
>> I attached an example where I expect an exception on the line 77, but
>> nothing happens. GDB reports that memmove is used and thus the
>> ThrowOnCopy objects are moved inside of a std::string and no exceptions
>> are thrown.
>>
>> Is this behavior intentional?
>>
>> Regards,
>> Ivan
> 
> [strings.general]/1:
> 
> This Clause describes components for manipulating sequences of any
> non-array POD type. Such types are called char-like types, and objects
> of char-like types are called char-like objects or simply characters.
> 
> Your ThrowOnCopy isn't a POD. PODs don't throw exceptions when copied.
> 
> 
>

References:
- std::string<ThrowOnCopy> behavior
  - From: Ivan Baravy
- Re: std::string<ThrowOnCopy> behavior
  - From: Tim Song

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]