[Interest] Why QString and not std::string?

Constantin Makshin cmakshin at gmail.com
Fri Jun 15 14:12:55 CEST 2012


On 06/15/2012 02:55 PM, Konstantin Tokarev wrote:
> 15.06.2012, 14:50, "Rui Maciel" <rui.maciel at gmail.com>:
>> Does anyone know what's the rationale for relying on Qt's custom QString
>> instead of simply using C++'s standard and omnipresent std::string?
> 1. Historical reasons - STL was not implemented on the same level in all compilers
> in the past.
> 2. std::string does not hadle UTF16 strings, and std::wstring is non-standard
3. std::string's behavior (e.g. use of the copy-on-write technique) is
implementation-dependent while QString is the same everywhere.
4. QString has more features (formatting, regular expressions, cheap
substring extraction through QStringRef, etc.).

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