Wednesday, November 7, 2018

Digest for comp.lang.c++@googlegroups.com - 19 updates in 6 topics

JiiPee <no@notvalid.com>: Nov 07 05:48PM

(sorry this is only 50% C++ issue but did not find any active group so
posted here)
 
Just a simple question regarding what am working with now. Its using
OpenGL with MFC (window programming, using views... view is one type of
window, dialog could be another type of window etc).
 
In View's (which is a window) draw function I could do:
1)
void MyView::OnDraw(CDC* pView)
{
    // do all opengl drawing calls here - could be 10-20 lines of code
}
 
or another approach (also recomended by some):
2)
void MyView::OnDraw(CDC* pView)
{
    m_openGLRenderer.Render(pView); // or just openGLRenderer.Render();
as the renderer knows the window already
}
 
So would have a member variable COpenGLRenderer m_openGLRenderer; and
just let this object do the opengl stuff. So view basically having no
(or only few) opengl related things in it.
Which way is better? If I do 1) the opengl code is bound with View-type
of Window (so could not re-use with other type of windowses for example,
like dialog window etc).
 
Does 1) break the "Single Responsibility Principle" rule because then
MyView is doing View-specific things and also OpenGL specific things? Or
can we think that view and opengl are both drawing issues so still
single responsibility?
So should the View just call opengl as much as possible via a
openGLrenderer object and keep View implementation as small as possible
and independent of the opengl? Or could just put all opengl
functionality inside view class?
Paavo Helde <myfirstname@osa.pri.ee>: Nov 07 09:10PM +0200

On 7.11.2018 19:48, JiiPee wrote:
> m_openGLRenderer.Render(pView); // or just openGLRenderer.Render();
> as the renderer knows the window already
> }
 
In my experience, whenever you just have a vague feeling that asking
such a question might be justified, it means that the components should
be definitely separated.
 
> So would have a member variable COpenGLRenderer m_openGLRenderer; and
> just let this object do the opengl stuff. So view basically having no
> (or only few) opengl related things in it.
 
Seems fine, except that the name COpenGLRenderer is using the MS/MFC
name conventions. If this is a class written by yourself it should not
use the "C" prefix, to reduce confusion.
 
> like dialog window etc).
 
> Does 1) break the "Single Responsibility Principle" rule because then
> MyView is doing View-specific things and also OpenGL specific things? Or
 
Exactly.
 
> can we think that view and opengl are both drawing issues so still
> single responsibility?
 
Nope. MFC and openGL are two very different things.
JiiPee <no@notvalid.com>: Nov 07 07:23PM

Thanks very much, because I needed some experts comments. I actually
agree with you but I have to get others convinced :).
(my comments below)
 
On 07/11/2018 19:10, Paavo Helde wrote:
 
> In my experience, whenever you just have a vague feeling that asking
> such a question might be justified, it means that the components
> should be definitely separated.
 
I also feel this...
 
 
> Seems fine, except that the name COpenGLRenderer is using the MS/MFC
> name conventions. If this is a class written by yourself it should not
> use the "C" prefix, to reduce confusion.
 
sure, I also dont use C elsewhere.
 
 
>> Does 1) break the "Single Responsibility Principle" rule because then
>> MyView is doing View-specific things and also OpenGL specific things? Or
 
> Exactly.
 
I also thought so
 
 
>> can we think that view and opengl are both drawing issues so still
>> single responsibility?
 
> Nope. MFC and openGL are two very different things.
 
yeps! somebody agrees me , Bingo, hehe
 
legalize+jeeves@mail.xmission.com (Richard): Nov 07 08:01PM

[Please do not mail me a copy of your followup]
 
no@notvalid.com spake the secret code
 
>Does 1) break the "Single Responsibility Principle" rule because then
>MyView is doing View-specific things and also OpenGL specific things?
 
Yes.
 
>Or
>can we think that view and opengl are both drawing issues so still
>single responsibility?
 
Nope.
 
>So should the View just call opengl as much as possible via a
>openGLrenderer object and keep View implementation as small as possible
>and independent of the opengl?
 
Yes.
 
>Or could just put all opengl
>functionality inside view class?
 
Nope.
 
In addition to what you observed about violating SRP, combining these
two together makes it difficult to unit test these classes.
--
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The Terminals Wiki <http://terminals-wiki.org>
The Computer Graphics Museum <http://computergraphicsmuseum.org>
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JiiPee <no@notvalid.com>: Nov 07 08:37PM

On 07/11/2018 20:01, Richard wrote:
> In addition to what you observed about violating SRP, combining these
> two together makes it difficult to unit test these classes.
 
 
Thanks, good to hear second confirmation :).
 
Yes I sense there are many benefits lurking there... intuitively also.
Manfred <noname@add.invalid>: Nov 07 09:52PM +0100

On 11/7/2018 6:48 PM, JiiPee wrote:
> Or can we think that view and opengl are both drawing issues so still
> single responsibility?
 
As others have already answered, MFC and OpenGL are very different things.
More generally, the View class takes care of interfacing with the
display context, i.e. the windowing system.
The Renderer class takes care of... well, the rendering.
These are different things, also considering different alternatives -
e.g. X-Windows and DirectX. (the latter only works on Windows, but you
get the point)
 
Ideally the only overlap between the two should be mapping the HGLRC
onto the HDC.
"Rick C. Hodgin" <rick.c.hodgin@gmail.com>: Nov 07 08:34AM -0800

On Wednesday, November 7, 2018 at 6:32:22 AM UTC-5, Rick C. Hodgin wrote:
> Is neoGFX available for use? I have a production app I'd like to try
> neoGFX for. I am serious.
 
> I could help you debug it as it's tested by another set of eyes.
 
Never mind. I've found another product I can use.
 
--
Rick C. Hodgin
Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk>: Nov 07 06:03PM

On 07/11/2018 11:32, Rick C. Hodgin wrote:
> Is neoGFX available for use? I have a production app I'd like to try
> neoGFX for. I am serious.
 
> I could help you debug it as it's tested by another set of eyes.
 
I need help from you like I need a hole in the head.
 
/Flibble
 
--
"You won't burn in hell. But be nice anyway." – Ricky Gervais
 
"I see Atheists are fighting and killing each other again, over who
doesn't believe in any God the most. Oh, no..wait.. that never happens." –
Ricky Gervais
 
"Suppose it's all true, and you walk up to the pearly gates, and are
confronted by God," Bryne asked on his show The Meaning of Life. "What
will Stephen Fry say to him, her, or it?"
"I'd say, bone cancer in children? What's that about?" Fry replied.
"How dare you? How dare you create a world to which there is such misery
that is not our fault. It's not right, it's utterly, utterly evil."
"Why should I respect a capricious, mean-minded, stupid God who creates a
world that is so full of injustice and pain. That's what I would say."
Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk>: Nov 07 06:05PM

On 07/11/2018 16:34, Rick C. Hodgin wrote:
>> neoGFX for. I am serious.
 
>> I could help you debug it as it's tested by another set of eyes.
 
> Never mind. I've found another product I can use.
 
This is great news; I might even change my software's licence to deny
permission of use to proselytizing Christians.
 
And Satan invented fossils, yes?
 
/Flibble
 
--
"You won't burn in hell. But be nice anyway." – Ricky Gervais
 
"I see Atheists are fighting and killing each other again, over who
doesn't believe in any God the most. Oh, no..wait.. that never happens." –
Ricky Gervais
 
"Suppose it's all true, and you walk up to the pearly gates, and are
confronted by God," Bryne asked on his show The Meaning of Life. "What
will Stephen Fry say to him, her, or it?"
"I'd say, bone cancer in children? What's that about?" Fry replied.
"How dare you? How dare you create a world to which there is such misery
that is not our fault. It's not right, it's utterly, utterly evil."
"Why should I respect a capricious, mean-minded, stupid God who creates a
world that is so full of injustice and pain. That's what I would say."
"Rick C. Hodgin" <rick.c.hodgin@gmail.com>: Nov 07 11:18AM -0800

On Wednesday, November 7, 2018 at 1:03:35 PM UTC-5, Mr Flibble wrote:
> > neoGFX for. I am serious.
 
> > I could help you debug it as it's tested by another set of eyes.
 
> I need help from you like I need a hole in the head.
 
I need help from you, Leigh. Without your participation in my
life I am incomplete. As are you without mine. As are we all
without the participation of others in our lives ... but you have
mine ... if you'd receive it.
 
I would still like to evaluate neoGFX if it's ready. I have
found a nice GUI that I'll be using. It's the FOX toolkit at
http://www.fox-toolkit.org. Never heard of it before, but it's
nice. I downloaded the code and was able to get everything to
compile first time in Visual Studio out of the box (save the
need to setup some custom build tool paths to my local folder
use).
 
Screenshots:
 
http://www.fox-toolkit.org/screenshots/iims1.png
http://www.fox-toolkit.org/screenshots/iims2.png
http://www.fox-toolkit.org/screenshots/iims3.png
 
Looks easy enough to code in, and plenty of built-in abilities,
not all of which are shown on those screenshots.
 
--
Rick C. Hodgin
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IL CIUCCIA E PRENDI MEGA CAZZI A GO GO LUIGI BERLUSCONI (BACIO RICCHIONESCHISSIMO QUI
https://www.tuttouomini.it/images/2017/7/luigi-berlusconi-bacio-gay-estate-amico.jpg ) NATO IN FIGHETTINA ARLESHEIM (CH) IL 27.9.1988. SI, PROPRIO LUI: L'OMOSESSUALE ^OCCULTO^ LUIGI BERLUSCONI DI BASTARDAMENTE CRIMINALE ELIGOTECH AMSTERAM, BASTARDAMENTE CRIMINALE SOLDO LTD LONDON E BASTARDAMENTE CRIMINALE BANCA MEDIOLANUM (CHE RICICLANO MONTAGNE DI € MAFIOSI, ESATTAMENTE COME FACEVA LA CRIMINALISSIMA BANCA RASINI DI SUO NONNO, TOPO DI FOGNA LUIGI BERLUSCONI ....O COME FACEVA E FA ORA PIU' CHE MAI, LA FININVEST DEL PEDOFILO DILANIANTE FALCONE E BORSELLINO: SILVIO BERLUSCONI
http://www.vnews24.it/2014/05/29/borsellino-sentenza-choc-stragi-commissionate-berlusconi/






4
E DELLA CRIMINALISSIMA, HITLERIANA, ^OCCULTA" LESBICA MARINA BERLUSCONI
https://twitter.com/premolisimona/status/876055837420158976 )
INSIEME AL BERLUS-CO-RROTTO VERME MARCO CARRAI DI CGNAL, CREA NAZITECNOLOGICHE NUOVE OVRA E GHESTAPO! COL NOTO ANTI SEMITA, GIA' 3 VOLTE FINITO IN CARCERE, PAOLO BARRAI, NATO A MILANO IL 28.6.1965 ( FINITO IN CARCERE PURE IN BRASILE, ED ANCHE PER PEDOFILIA OMOSESSUALE: INCULAVA LI I BAMBINI, NE SCRIVEREMO PRESTO
http://www.rotadosertao.com/images/fotos/fotos_noticias/testao.jpg
https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjTiy_twjOPYIaKWznyd9HxfmJs8PmzhN3NL3zMDaQkn7GY2hkLpIt6RKb8T1JrsKlFYPlynZxgWy48xtZRmWsxBrjnB9i9yCPIFO5EzNDYaXqtLYgQZgjZrQrS-ICNslSnJx2Rne3CAV8/s1600/barrai+ind-pag01.jpg )!
COL TUTTO, PER FINIRE, UNITISSIMO ALL'ECONOMISTA NOTORIAMENTE MOLTO PEDOFILO, NAZISTA ED ASSASSINO PAOLO CARDENÀ DI SAN PAOLO INVEST E MALAVITOSA MEDIOLANUM STESSA.
http://www.py.cz/pipermail/python/2017-September/013036.html
https://a.mytrend.it/authors/1385.jpg

NATO A MACERATA IL 2.19.1971 E RESIDENTE A PENNA SAN GIOVANNI (MACERATA), VIA UMBERTO I, NUMERO 41. COME ANCHE IN VIA POZZO 105, 63837 FALERONE (FM) https://www.commoditiestrading.it/public/autori/635338392358575000_Cardena.jpg
STO MERDAIO MEGA OMICIDA ERA DIETRO LO STUPRO DI GRUPPO EFFETTUATO A PAMELA MASTROPIETRO.
http://nomassoneriamacerata.blogspot.com/2018/02/lomicidio-di-pamela-mastropietro.html
A CUI HA FATTO SEGUITO UN RITUALE MASSONICO NAZIFASCISTA, EFFETTUATO PROPRIO DAL SATANISTA ASSASSINO E PEDOFILO PAOLO CARDENA', PORTANTE ALLA DIVISIONE DEL CORPO DI PAMELA ( EFFETTUATA DA MEDICI LEGALI MASSONI SANGUINARI, COME AI TEMPI DEL MOSTRO DI FIRENZE: FRATELLI CRIMINALISSIMI DEI PAZZI OMICIDA PAOLO CARDENA' E STEFANO CARDENA' DI CRIMINALISSIME CARDENA' AND PARTNERS E CARDENA' CONSULTING).
QUESTO LINK QUADRA OGNI COSA, A PROPOSITO
http://m.dagospia.com/clamoroso-a-macerata-sospetti-su-un-giro-di-baby-squillo-dietro-l-omicidio-di-pamela-mastropietro-171763
HAN POI TROVATO 4 LORO SCUGNIZZI MALAVITOSI NIGERIANI PER GIRARE A LORO OGNI COLPA ( I QUALI, ORA, IN CARCERE, DALTRONDE, AVRANNO VITTO E ALLOGGIO PER UN TOT DI TEMPO, PIU' TANTI SOLDI QUA E LA, RICEVUTI DA QUESTI MASSONI ASSASSINI, PER STARE ZITTI.. COSI' CHE FRA QUALCHE ANNO USCIRANNO DALLE CELLE E SARANNO PURE BENESTANTI).
DI QUESTO NE SCRIVONO E DICONO NOTI MASSONI DI ESTREMA DESTRA STESSA, QUALI FABIO FRABETTI, PAOLO FRANCESCHETTI E SPECIALMENTE GIANFRANCO CARPEORO, IN REALTA', A LIVELLO DI VERO NOME E COGNOME, GIANFRANCO PECORARO, ( CHE, VIA MARI DI LOGGE MASSONICHE, SON ADDENTRO DA UNA VITA A QUESTO TIPO DI OMICIDI, QUINDI, SANNO ALLA PERFEZIONE OGNI COSA ED AMMIREVOLISSIMAMENTE CE NE FANNO SAPERE)
http://petalidiloto.com/2018/02/due-parole-sullomicidio-pamela-mastropietro.html
http://petalidiloto.com/2012/12/intervista-carpeoro-su-massoneria-e.html
QUESTO E' SONO UN ANTIPASTINO. I PIATTI FORTI ARRIVERANNO AL PIU' PRESTO POSSIBILE.
O IL PEDOFILO SPAPPOLA MAGISTRATI...
O IL NAZIMAFIOSO ASSASINO SILVIO BERLUSCONI..
O IL DITTATORE COCAINOMANE DISTRUGGI VITE ALTRUI SILVIO BERLUSCONI..
.. AMMETTE IL MALE INGIUSTIFICATISSIMO FATTO,
.. AMMETTE IL MALE DAVVERO INGIUSTISSIMO ED OMICIDA, FATTO ( SA' BENISSIMO A CHE E CHI MI RIFERISCO). E RISARCISCE. O LA GIUSTIZIA LA FARO' IO. NEI SUOI CONFRONTI E NEI CONFRONTI DI TUTTI I PORCI E VERMI CHE RADONO AL SUOLO VITE DI INNOCENTI, PER LUI! PER SUA BORIA, SATANAZIFASCISMO, COCAINA, SOLDI MAFIOSI, ARROGANZA, ORGE PEDOFILESCHE, SCORCIATOIE SOCIALI, PREPOTENZA, EGOCENTRISMO, ANTIDEMOCRAZIA, PERVERSIONE, CORRUZIONE, COSA NOSTRA, CAMORRA, NDRANGHETA, SACRA CORONA UNITA, VANITA', BRAMA DI CAMMINARE A MORTE SULLE ESISTENZE ALTRUI. O FATTI O CAZZI AMARI, DA ORA E PER SEMPRE, PER GLI ASSASSINI, STRAGISTI, NAZIMAFIOSI, EFFERATISSIMI CRIMINALI IN FIGHETTINA E RUBATA CRAVATTA: BERLUSCONI!
5
MA ORA VOGLIO PARLARE DI ME, SI, PROPRIO DI ME!
CIAO A TUTTI. SONO LA VICENTISSIMA PORNOSTAR, INSEGNANTE A MILANO, MASSONA DI ALTO GRADO, INFORMATRICE DI SERVIZI SEGRETI DI MEZZO MONDO: MARIA GRAZIA CRUPI. NATA IL 30.10.1969. NOTA IN TUTTO IL PIANETA TERRA PER ESSER STATA PER BEN 12 ANNI, LA PIU' FOCOSA FRA TANTISSIME AMANTI LESBICHE DI MARINA BERLUSCONI (
https://plus.google.com/108636656730606836659
https://plus.google.com/102103531009107965093
https://plus.google.com/100248419268040066274 )
ED ORA FATEMI URLARE CON TUTTE LE MIE FORZE, PLEASE....
L'IMMENSO PRENDI CAZZI IN CULO LUIGI BERLUSCONI (FIDANZATA-WIKIPEDIA-PADRE SPAPPOLA MAGISTRATI E SBAUSCIA TROIE POCO PIU' CHE BAMBINE, "SILVIO BERLUSCON PER SEMPRE FUORI DAI COGLIONI") DI CRIMINALISSIMA FININVEST ALIAS (MA)FI(A)NINVEST, CRIMINALISSIMA MOLMED SPA, CRIMINALISSIMA HOLDING ITALIANA QUATTORDICESIMA SPA ALIAS CRIMINALISSIMA H14 (GIA'
Bo Persson <bop@gmb.dk>: Nov 07 03:05PM +0100

On 2018-11-07 14:37, Queequeg wrote:
> in scope as long as the thread is accessing it -- fn3 will not return).
 
> This code works, but is it possible to implement fn2() it in one line,
> without creating a temporary variable?
 
Probably not.
 
You are not allowed to take the address of a temporary (an rvalue), so
yoy have to store the pointer somewhere first to get an lvalue. Like in
your example.
 
 
Bo Persson
Manfred <noname@add.invalid>: Nov 07 05:42PM +0100

On 11/7/2018 2:37 PM, Queequeg wrote:
 
> In other words, I want to reference (verb) the reference (noun), getting
> its pointer, and then pass this pointer as a stream of bytes to another
> function, which reads the `sz` bytes from area pointed to by `p`.
In C++ you cannot get a pointer to a reference. You get a pointer to the
referenced object instead - as Bjarne says, 'a reference is not an
object', so you can't take its address.
In your code:
> int *iptr(&iref);
 
iptr is not a pointer to iref, it is a pointer to 'i' inside fn3().
Moreover, when you pass &iptr to fn1() you are passing a pointer to
iptr, i.e. an object inside fn2(), so from your description it looks
like you are creating a dangling pointer as soon as you leave fn2().
 
I need
> it to pass the address of `i`
If you need to pass the address of `i` you should pass iptr, not &iptr,
unless I am missing something.
 
across threads over socket-based IPC, so
> in scope as long as the thread is accessing it -- fn3 will not return).
 
> This code works, but is it possible to implement fn2() it in one line,
> without creating a temporary variable?
 
Depending on how the receiving side uses the pointer, what would be
wrong with fn1(&i, sizeof(i)) ?
Ralf Fassel <ralfixx@gmx.de>: Nov 07 06:37PM +0100

* queequeg@trust.no1 (Queequeg)
--<snip-snip>--
| void fn2(int &iref)
| {
| int *iptr(&iref);
| fn1(&iptr, sizeof(iptr));
| }
--<snip-snip>--
 
| This code works, but is it possible to implement fn2() it in one line,
| without creating a temporary variable?
 
I'd say
 
void fn2(int &iref)
{
fn1(&iref, sizeof(int*));
}

should work...
 
In your fn2(), you are passing the address of the temporary _pointer_,
not the address of the pass-by-reference-variable, which seems wrong to
me. Instead it should be fn1(iptr, sizeof(iptr)).
 
R'
ram@zedat.fu-berlin.de (Stefan Ram): Nov 07 04:11PM

>This code works, but is it possible to implement fn2() it in one line,
>without creating a temporary variable?
 
Yesterday I had a related thought:
 
In the past, one was only able to create /named/ functions
in C++. Lambda functions then allowed one to create
/anonymous/ functions.
 
It's the same with automatic storage locations: They have to
be created using a /name/.
 
In theory, there could be a function called, say (wait, let
me invent a name ...), »alloca«, that returns an /anonymous/
automatic storage location.
 
You would need a variant of »alloca« that creates a new
object from a type and an initializer, so that you could
then use
 
fn1( &my_alloca( int *, &iref ), sizeof( int * ))
 
. Programming must be liberated from the tyranny of names!
ram@zedat.fu-berlin.de (Stefan Ram): Nov 07 04:17PM

>Distribution through any means other than regular usenet
 
Sorry! I am using a new version of my Usenet client.
It seems to have copied some of the headers into the body.
Still need to learn how to handle that Usenet client!
Stefan Ram <ram@zedat.fu-berlin.de>: Nov 07 04:17PM

cancel <remark-20181107171452@ram.dialup.fu-berlin.de> in newsgroup comp.lang.c++
 
This article was cancelled from within 6.7.3 (NOV)
Stefan Ram <ram@zedat.fu-berlin.de>: Nov 07 04:17PM

cancel <alloca-20181107171019@ram.dialup.fu-berlin.de> in newsgroup comp.lang.c++
 
This article was cancelled from within 6.7.3 (NOV)
Chris Vine <chris@cvine--nospam--.freeserve.co.uk>: Nov 07 02:28PM

On Wed, 7 Nov 2018 05:56:32 -0800 (PST)
 
> Yes. Apple has its modified version of unknown LLVM/clang
> Tried with "Apple LLVM version 10.0.0 (clang-1000.11.45.2)".
> That does not compile it either and is perhaps latest so ... bad news.
 
I imagine it probably compiles if 'if (flag)' is substituted for
'if constexpr (flag)' (I can't test here as I cannot reproduce the bug),
and I bet it still optimizes out the unreachable branch where 'flag' is
a constant expression evaluating to false. So the news may not be
completely bad.
 
Furthermore, with 'if (flag)' my versions of clang and gcc with default
warnings do not warn about the unreachable branch (which you wouldn't
want it to do in this case).
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