> On 12 sept. 2015, at 10:19, Till Oliver Knoll <till.oliver.kn...@gmail.com>
> wrote:
>
>
>> Am 11.09.2015 um 19:59 schrieb Matthew Woehlke <mwoehlke.fl...@gmail.com>:
>>
>>> On 2015-09-11 13:41, Till Oliver Knoll wrote:
>>> You can further reduce the "dependency tree" of your sources by
>>> making use of the private "d-pointer" pattern (there is a name for
>>> it which currently escapes me)
>>
>> PIMPL? ;-)
>>
>> https://en.wikipedia.org/wiki/Pimpl
>
> Exactly :) Even though I had the term "Cheshire Cat" in mind :) (I yet have
> to google why that pattern is named after a cat).
>
> But while we're there, quoting from that article:
>
> "One type of opaque pointer commonly used in C++ class declarations is the
> d-pointer. The d-pointer is the only private data member of the class and
> points to an instance of a struct. Named by Arnt Gulbrandsen of Trolltech,
> this method allows class declarations to omit private data members, except
> for the d-pointer itself.[6] The result: (a) more of the class implementation
> is hidden from view; (b) adding new data members to the private struct does
> not affect binary compatibility; (c) the header file containing the class
> declaration only needs to #include those other files needed for the class
> interface, rather than for its implementation. One side benefit is that
> compilations are faster because the header file changes less often. The
> d-pointer is heavily used in the Qt and KDE libraries."
>
>
> Couldn't have explained it better :) Oh and yes, Trolltech is the initial
> company(*) that brought us Qt! ;)
>
> Cheers,
> Oliver
>
>
> (*) IIRC they did have (slightly) different names before that
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Hi,
Because the d pointer is the equivalent of the smile of the Cheshire Cat, the
only visible part: d => D
Cheers
Samuel
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