[cfe-dev] searching for an empty string in an empty string

[Vladimir Voskresensky]

Hello Tomek,

your code is in C++11 style.
C++11 is supported in Studio compiler starting from 12.4.
with -std=c++11 gnu's C++ library is used by studio and pos is 0.

Thanks,
Vladimir.

On 04.06.2015 00:16, Tomasz Mikolajczyk wrote:
> Hi Vladimir,
>
> It is already a few years that I do not work for that company and I do 
> not remember the exact version of the product. I think it was sunpro 
> either 11 or 12. Also it may depend on the underlying std library you 
> use. I remember that the default one - the rogue wave implementation 
> (http://docs.roguewave.com/legacy-hpp/stdref/ 
> <https://urldefense.proofpoint.com/v2/url?u=http-3A__docs.roguewave.com_legacy-2Dhpp_stdref_&d=AwMFaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=CnzuN65ENJ1H9py9XLiRvC_UQz6u3oG6GUNn7_wosSM&m=K8vZq7WuwzH66QRihbkqouP0EHefzINWsPOh4D77KYw&s=AGcTc_IIa4IjjQ4aDI5bx3oWksF_a3KhS71uTw3Aods&e=>) 
> had some serious issues and it was necessary to switch to stlport 
> (there was a dedicated compiler flag). I think that stlport was 
> returning npos as a result of such searching.
>
> Regards,
> Tomek
>
> On Wed, Jun 3, 2015 at 8:38 PM, Vladimir Voskresensky - Oracle 
> <vladimir.voskresensky at oracle.com 
> <mailto:vladimir.voskresensky at oracle.com>> wrote:
>
>
>     On 06/ 2/15 05:51 PM, Tomasz Mikolajczyk wrote:
>>     Hi,
>>
>>     What should be the value of a pos variable in the following piece
>>     of code?
>>
>>     auto pos = std::string().find("");
>>
>>     I couldn't find answer to that and noticed it varies between
>>     standard library implementations. For most I've checked pos is 0
>>     (libstdc++, libcxx, msvc). I noticed it is npos for Oracle
>>     Solaris SunPRO. I think that both results are explainable. Is it
>>     an UB?
>     In the latest SunPRO 12.4 pos is 0 as well.
>
>     Vladimir.
>
>>
>>     Regards,
>>     Tomek
>>
>>
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