time delay loops?

hey /prog/
sepples is my hobby and i'm currently reading through a book called "c++: the complete reference". on page 77 the author is talking about "loops with no bodies" and says:
"Time delay loops are often used in programs. The following code shows how to create one by using for:
for(t=0;t<SOME_VALUE;t++);"

i looked in the appendix and that seems to be the only mention of it in the book.
can someone please kindly tell me what the fuck it is useful for? it just seems to be a waste of processing power.
am i missing something?

sometimes you simply have too much processing power and this is a handy way to get rid of it

>>1,2
C, malloc()

>>2
oh lawd, i lol'd

The author is a fucking moron. Burn that book and pick a new one from here:
http://c2.com/cgi/wiki?DefinitiveCplusplusBooks

>>5
alright,thanks.
ill take a look

TheCeePlusPlusProgrammingLanguage
I SEE CEE PLUS PLUS

what

The Sepples Programming Language.

>>1
Your book must have been written by an EXPERT 80's game PROGRAMMER.

You don't time delay by fucking using up processing power, the delay would be different on computers with different amount of Hz.

>>10
amount of Hz.

>>1
Once a moderately useful technique on highly standardised computers which could only process one task at a time, this method of timing has now fallen into obsoletion and should never be used.

>>10
Troll failed.

>>1
To add to >>12, any self-respecting compiler would (assuming SOME_VALUE is some constant) unroll the loop, then use constant substitution to reduce the entire thing into a single constant-time expression (t=SOME_VALUE). Then, when it sees that t isn't referenced anywhere (and is just an integer constant) it might mark the whole section as dead code and omit it from the binary altogether (possibly not, dead code removal can do weird shit sometimes).

The point is, -O3 is considered harmful.

>>13
Can you elaborate on that last part, please? About -O3.

>>14
It is ^considered _harmful.

>>1
It makes your program look heavy, MS overused this in Vista to make it look more bloated than it actually is. Also, huge malloc's.

volatile int t;
for(t=0; t<SOME_VALUE; t++)
    ;

volatile int t = SOME_VALUE;
while(t--);

ZOMG OPTIMIZED

>>18
Actually, no, volatile never gets optimized.
Or, if that was a joke, it wasn't funny.

Also it's impossible to [i]troll[i] one person, just look at definition of ``troll''

>>19
YHBT

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