A Google talk in 2008 by Kevlin Henney, "C++ Stylistics": http://www.youtube.com/watch?v=zh8W4ZglOlw

Some of the limits/problems of C++ he talks about are patched by Qt, like signals & slots, Q_FLAGS, Q_PROPERTY, Q_ENUMS:
http://doc.trolltech.com/latest/moc.html
GUIs have needs quite different from the features offered by standard C++: they don't need high speed processing, but they enjoy a good runtime reflection and few other things, most of them offered in some way by the Qt "Meta-Object Compiler".

Bye,
bearophile

bearophile wrote:
> A Google talk in 2008 by Kevlin Henney, "C++ Stylistics":
> http://www.youtube.com/watch?v=zh8W4ZglOlw
> 
> Some of the limits/problems of C++ he talks about are patched by Qt, like signals & slots, Q_FLAGS, Q_PROPERTY, Q_ENUMS:
> http://doc.trolltech.com/latest/moc.html
> GUIs have needs quite different from the features offered by standard C++: they don't need high speed processing, but they enjoy a good runtime reflection and few other things, most of them offered in some way by the Qt "Meta-Object Compiler".
> 
> Bye,
> bearophile

You may have missed it but I raised the topic of Qt, it's signals
and slots architecture and its meta object compiler, on this
newsgroup about two months ago under the subject

"Can D be cute (Qt)"

http://www.digitalmars.com/webnews/newsgroups.php?art_group=digitalmars.D&article_id=109832

Cheers
Justin Johansson

On 18/07/2010 11:42, Justin Johansson wrote:
> bearophile wrote:
>> A Google talk in 2008 by Kevlin Henney, "C++ Stylistics":
>> http://www.youtube.com/watch?v=zh8W4ZglOlw
>>
>> Some of the limits/problems of C++ he talks about are patched by Qt,
>> like signals & slots, Q_FLAGS, Q_PROPERTY, Q_ENUMS:
>> http://doc.trolltech.com/latest/moc.html
>> GUIs have needs quite different from the features offered by standard
>> C++: they don't need high speed processing, but they enjoy a good
>> runtime reflection and few other things, most of them offered in some
>> way by the Qt "Meta-Object Compiler".
>>
>> Bye,
>> bearophile
>
> You may have missed it but I raised the topic of Qt, it's signals
> and slots architecture and its meta object compiler, on this
> newsgroup about two months ago under the subject
>
> "Can D be cute (Qt)"
>
> http://www.digitalmars.com/webnews/newsgroups.php?art_group=digitalmars.D&article_id=109832
>
>
> Cheers
> Justin Johansson
>
>

I regret that this is such a silence discussion. In fact Lutger (sorry don't know your full name) has implemented a fine QT like thread safe Signal Slot library.

// Q_FLAGS, Q_PROPERTY, Q_ENUMS and GUI
Finally this means > we need more _traits() power.

--We have, afaik.  no support for isProperty(), and to make visual/interactive GUI development possible, isEvent() is also necessary.

-- Now that we know that Compile- to Run- time Reflection could be just a mixin template away we have another good reason to ask for more (meta)  _traits power.

--Uwe Salomon's Indigo library is also offering a lot of ideas in this regard .. one thing I would name here is internationalization.

--QT in D.... ?
D bindings to GUI APIs are already there, but wait ...

/
I think the point is to give a pure *D2 QT implementation* a go, and let's see WHERE the compiler/language is not good enough.

Like Andrei did it for his std.algorithm.
/
Bjoern

On Sun, 18 Jul 2010 23:21:14 +0200, BLS <windevguy@hotmail.de> wrote:

> On 18/07/2010 11:42, Justin Johansson wrote:
>> bearophile wrote:
>>> A Google talk in 2008 by Kevlin Henney, "C++ Stylistics":
>>> http://www.youtube.com/watch?v=zh8W4ZglOlw
>>>
>>> Some of the limits/problems of C++ he talks about are patched by Qt,
>>> like signals & slots, Q_FLAGS, Q_PROPERTY, Q_ENUMS:
>>> http://doc.trolltech.com/latest/moc.html
>>> GUIs have needs quite different from the features offered by standard
>>> C++: they don't need high speed processing, but they enjoy a good
>>> runtime reflection and few other things, most of them offered in some
>>> way by the Qt "Meta-Object Compiler".
>>>
>>> Bye,
>>> bearophile
>>
>> You may have missed it but I raised the topic of Qt, it's signals
>> and slots architecture and its meta object compiler, on this
>> newsgroup about two months ago under the subject
>>
>> "Can D be cute (Qt)"
>>
>> http://www.digitalmars.com/webnews/newsgroups.php?art_group=digitalmars.D&article_id=109832
>>
>>
>> Cheers
>> Justin Johansson
>>
>>
>
> I regret that this is such a silence discussion. In fact Lutger (sorry don't know your full name) has implemented a fine QT like thread safe Signal Slot library.
>
> // Q_FLAGS, Q_PROPERTY, Q_ENUMS and GUI
> Finally this means > we need more _traits() power.
>
> --We have, afaik.  no support for isProperty(), and to make visual/interactive GUI development possible, isEvent() is also necessary.

Copied from http://digitalmars.com/d/2.0/phobos/std_traits.html
isProperty can be implemented using:

functionAttributes!(foo.func) & FunctionAttribute.PROPERTY





>
> -- Now that we know that Compile- to Run- time Reflection could be just a mixin template away we have another good reason to ask for more (meta)   _traits power.
>
> --Uwe Salomon's Indigo library is also offering a lot of ideas in this regard .. one thing I would name here is internationalization.
>
> --QT in D.... ?
> D bindings to GUI APIs are already there, but wait ...
>
> /
> I think the point is to give a pure *D2 QT implementation* a go, and let's see WHERE the compiler/language is not good enough.
>
> Like Andrei did it for his std.algorithm.
> /
> Bjoern

On Mon, 19 Jul 2010 10:52:51 +0200, Rory McGuire <rmcguire@neonova.co.za> wrote:

> On Sun, 18 Jul 2010 23:21:14 +0200, BLS <windevguy@hotmail.de> wrote:
>
>> On 18/07/2010 11:42, Justin Johansson wrote:
>>> bearophile wrote:
>>>> A Google talk in 2008 by Kevlin Henney, "C++ Stylistics":
>>>> http://www.youtube.com/watch?v=zh8W4ZglOlw
>>>>
>>>> Some of the limits/problems of C++ he talks about are patched by Qt,
>>>> like signals & slots, Q_FLAGS, Q_PROPERTY, Q_ENUMS:
>>>> http://doc.trolltech.com/latest/moc.html
>>>> GUIs have needs quite different from the features offered by standard
>>>> C++: they don't need high speed processing, but they enjoy a good
>>>> runtime reflection and few other things, most of them offered in some
>>>> way by the Qt "Meta-Object Compiler".
>>>>
>>>> Bye,
>>>> bearophile
>>>
>>> You may have missed it but I raised the topic of Qt, it's signals
>>> and slots architecture and its meta object compiler, on this
>>> newsgroup about two months ago under the subject
>>>
>>> "Can D be cute (Qt)"
>>>
>>> http://www.digitalmars.com/webnews/newsgroups.php?art_group=digitalmars.D&article_id=109832
>>>
>>>
>>> Cheers
>>> Justin Johansson
>>>
>>>
>>
>> I regret that this is such a silence discussion. In fact Lutger (sorry don't know your full name) has implemented a fine QT like thread safe Signal Slot library.
>>
>> // Q_FLAGS, Q_PROPERTY, Q_ENUMS and GUI
>> Finally this means > we need more _traits() power.
>>
>> --We have, afaik.  no support for isProperty(), and to make visual/interactive GUI development possible, isEvent() is also necessary.
>
> Copied from http://digitalmars.com/d/2.0/phobos/std_traits.html
> isProperty can be implemented using:
>
> functionAttributes!(foo.func) & FunctionAttribute.PROPERTY
>
>
>
>
>
>>
>> -- Now that we know that Compile- to Run- time Reflection could be just a mixin template away we have another good reason to ask for more (meta)   _traits power.
>>
>> --Uwe Salomon's Indigo library is also offering a lot of ideas in this regard .. one thing I would name here is internationalization.
>>
>> --QT in D.... ?
>> D bindings to GUI APIs are already there, but wait ...
>>
>> /
>> I think the point is to give a pure *D2 QT implementation* a go, and let's see WHERE the compiler/language is not good enough.
>>
>> Like Andrei did it for his std.algorithm.
>> /
>> Bjoern




template isProperty(alias func) if (isCallable!(func)) {
	enum isProperty = (functionAttributes!(func) & FunctionAttribute.PROPERTY)==0 ? false : true;
}

On 19/07/2010 10:58, Rory McGuire wrote:
>
> template isProperty(alias func) if (isCallable!(func)) {
>      enum isProperty = (functionAttributes!(func) &
> FunctionAttribute.PROPERTY)==0 ? false : true;
> }


THANKS Rory

isProperty() should become part of phobos.

On Mon, 19 Jul 2010 20:33:59 +0200, BLS <windevguy@hotmail.de> wrote:

> On 19/07/2010 10:58, Rory McGuire wrote:
>>
>> template isProperty(alias func) if (isCallable!(func)) {
>>      enum isProperty = (functionAttributes!(func) &
>> FunctionAttribute.PROPERTY)==0 ? false : true;
>> }
>
>
> THANKS Rory
>
> isProperty() should become part of phobos.

I suppose so, currently one needs to make a wrapper for all the function attributes that you
might want to detect.