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A very basic computing question, which I don't know the answer to, sorry to say.
Suppose I have a gigantic scene file, with lots of #includes, etc. Plus an #if
block at the very end:
#declare A = 1; // a boolean value
#include .....
#include .....
#include .....
.........
.........
.........
.........
.........
#if(A)
--do something--
#else
#end
--end of scene file---
I'm not a software engineer or a full-blown programmer, so my question (actually
two) concerns the scene's parse time:
1) When the #if is finally 'processed', does POV-Ray (or any coding language)
have to search back through the entire code to find A?
2) If so, would the scene parse faster if the #if block was nearer to the
#declared A?
#declare A = 1;
#if(A)
--do something--
#else
#end
#include .....
#include .....
#include .....
.........
.........
.........
.........
.........
--end of scene file---
Perhaps the #includes muddy the issue, but I'm mostly concerned about the
fastest ordering of elements in general.
Ken
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From: Warp
Subject: Re: coding question--position of #if block in SDL
Date: 28 Jan 2010 12:42:37
Message: <4b61cc8d@news.povray.org>
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Kenneth <kdw### [at] earthlink net> wrote:
> 1) When the #if is finally 'processed', does POV-Ray (or any coding language)
> have to search back through the entire code to find A?
No.
> 2) If so, would the scene parse faster if the #if block was nearer to the
> #declared A?
No.
--
- Warp
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From: Jim Holsenback
Subject: Re: coding question--position of #if block in SDL
Date: 28 Jan 2010 12:45:30
Message: <4b61cd3a@news.povray.org>
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> I'm not a software engineer or a full-blown programmer,
I'm not the former ... some would debate that I'm even the later
> two) concerns the scene's parse time:
> 1) When the #if is finally 'processed', does POV-Ray (or any coding
> language)
> have to search back through the entire code to find A?
> 2) If so, would the scene parse faster if the #if block was nearer to the
> #declared A?
don't think it matters, as after the scene file has passed the parse phase
and read into memory, variables are referenced by a pointer to it's location
in memory not a sequential search of the memory.
Jim
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Thanks to both of you. That answers a long-standing question I've had--not just
concerning #if's, but coding in general.
My only 'real' experience with programming is quite antidiluvian--back in the
days of Hollerith cards(!) in college--much of which I've forgotten. POV-Ray and
the newsgroups have *vastly* expanded my knowledge!!
Ken
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