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This syntax is new to me:
/* POV-Ray Message Classes */
enum
{
kPOVMsgClass_RenderControl = 'Ctrl',
kPOVMsgClass_RenderOutput = 'Outp',
kPOVMsgClass_IniOptions = 'IniO',
kPOVMsgClass_Miscellaneous = 'Misc'
}; // How does this work ? --^^^^^
'Ctrl' is quite a bit different from what I'm used to using for enumeration,
and also looks a bit like a four-byte char?
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AngleWyrm wrote:
> This syntax is new to me:
>
> /* POV-Ray Message Classes */
> enum
> {
> kPOVMsgClass_RenderControl = 'Ctrl',
> kPOVMsgClass_RenderOutput = 'Outp',
> kPOVMsgClass_IniOptions = 'IniO',
> kPOVMsgClass_Miscellaneous = 'Misc'
> }; // How does this work ? --^^^^^
>
> 'Ctrl' is quite a bit different from what I'm used to using for enumeration,
> and also looks a bit like a four-byte char?
>
These are multicharacter character constants but they do not need to
bother you.
Christoph
--
POV-Ray tutorials, include files, Sim-POV,
HCR-Edit and more: http://www.tu-bs.de/~y0013390/
Last updated 11 Jan. 2004 _____./\/^>_*_<^\/\.______
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On Sat, 31 Jan 2004 12:42:19 -0800, "AngleWyrm"
<no_### [at] hotmail com> wrote:
> 'Ctrl' is quite a bit different from what I'm used to using for enumeration,
> and also looks a bit like a four-byte char?
'Ctrl' is alternative notation for 32-bit integers here.
ABX
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AngleWyrm <no_### [at] hotmailcom> wrote:
> kPOVMsgClass_RenderControl = 'Ctrl',
> 'Ctrl' is quite a bit different from what I'm used to using for enumeration,
> and also looks a bit like a four-byte char?
'Ctrl' is the value 1131704940.
(If you can't deduce why, I can explain that as well.)
--
#macro M(A,N,D,L)plane{-z,-9pigment{mandel L*9translate N color_map{[0rgb x]
[1rgb 9]}scale<D,D*3D>*1e3}rotate y*A*8}#end M(-3<1.206434.28623>70,7)M(
-1<.7438.1795>1,20)M(1<.77595.13699>30,20)M(3<.75923.07145>80,99)// - Warp -
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"Warp" <war### [at] tagpovrayorg> wrote in message
news:401e2be7@news.povray.org...
> AngleWyrm <no_### [at] hotmailcom> wrote:
> > kPOVMsgClass_RenderControl = 'Ctrl',
> 'Ctrl' is the value 1131704940.
> (If you can't deduce why, I can explain that as well.)
'C'<<32|'t'<<16|'r'<<8|'l'
What I can't deduce is where/how the value of the enum is used.
I've seen some lines using if(cur->handledclass == hclass) type statements,
but this is just normal enum handling.
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"ABX" <abx### [at] abxartpl> wrote in message
news:t58s1015437i6sh8q0jv9m16sm6eomafna@4ax.com...
> On Sat, 31 Jan 2004 12:42:19 -0800, "AngleWyrm"
> <no_### [at] hotmailcom> wrote:
> > 'Ctrl' is quite a bit different from what I'm used to using for
enumeration,
> > and also looks a bit like a four-byte char?
>
> 'Ctrl' is alternative notation for 32-bit integers here.
So this would be saying the same thing sleightly differently:
#define CTRL 1131704940
enum { kPOVMsgClass_RenderControl = CTRL }
Is this numerical encoding used as an error catching mechanism during code
construction? I haven't been able to find further references to 'Ctrl'
outside the enum declaration.
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On Wed, 4 Feb 2004 23:21:28 -0800, "AngleWyrm" <no_### [at] hotmailcom>
wrote:
> Is this numerical encoding used as an error catching mechanism during code
> construction? I haven't been able to find further references to 'Ctrl'
> outside the enum declaration.
Are you looking references to 'Ctrl' or to kPOVMsgClass_RenderControl?
ABX
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"ABX" <abx### [at] abxartpl> wrote in message
news:60t320p8r7lpgepjg2nplk9ptkkgskioq9@4ax.com...
> On Wed, 4 Feb 2004 23:21:28 -0800, "AngleWyrm"
<no_### [at] hotmailcom>
> wrote:
> > Is this numerical encoding used as an error catching mechanism during
code
> > construction? I haven't been able to find further references to 'Ctrl'
> > outside the enum declaration.
>
> Are you looking references to 'Ctrl' or to kPOVMsgClass_RenderControl?
'Ctrl'
If the enums were given specific values, it was my guess that at some point
in the program a comparison to, or usage of those specific values would take
place. Makes sense?
Thus I surmized that there must be more than one occurance of the term 'Ctl'
within the source files, so I went looking for this. I only found the one
occurance, and this got me wondering if it was an exception to a norm. Hey
maybe the rest of them or even just some of them are used in some
comparison.
So I did a grep search on '\(....\)' to find all single quoted four-letter
blocks. The only code (besides comments) that came back were the
enumerations themselves. (www.textpad.com, nice notepad replacement)
Thus far, it seems that my guess may be in error; perhaps those values
aren't used anywhere else?
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Some possible reasons:
* It may have applied to old code that is no longer a part of the program
* It may have applied to an old plan that was never implemented
* It may have been a method of creating a 'sparse' enum set, to avoid
accidentally refererencing with the wrong kind--But there's a better ways to
catch that mishap:
enum animals {CAT, DOG, MOUSE};
enum colors {RED,GREEN,BLUE};
void MyAnimalFunc( animals eInput ){}; // enum type specified
int main(void)
MyAnimalFunc( CAT ); // works fine
MyAnimalFunc( RED ); // compiler gets it: cannot convert 'colors' to
'animals'
}
* It might apply to tools/utilities that reside outside the program
* I've overlooked something totally obvious, and should go get another cup
of coffee
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In article <40222523@news.povray.org> , "AngleWyrm"
<no_### [at] hotmailcom> wrote:
> If the enums were given specific values, it was my guess that at some point
> in the program a comparison to, or usage of those specific values would take
> place. Makes sense?
No, nobody would define enums and then not use them. Enums are given
"names" because those mean more to a human when debugging. Otherwise you
would always have to manually count which value you are currently dealing
with, which is insane if you are dealing with more than just a handful of
value.
Thorsten
____________________________________________________
Thorsten Froehlich, Duisburg, Germany
e-mail: tho### [at] trfde
Visit POV-Ray on the web: http://mac.povray.org
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