"FOR" in preprocessor macro

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songie D - 11 May 2004 22:27 GMT

would it be possible to sort of engineer some sort of preprocessor macro
that does a 'for' loop.
i.e. for where you would normally use a normal for loop, but when it is
known ay compile time whay the variable is, hence unrolling the loop.

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Carl Daniel [VC++ MVP] - 11 May 2004 23:34 GMT

> would it be possible to sort of engineer some sort of preprocessor
> macro that does a 'for' loop.
> i.e. for where you would normally use a normal for loop, but when it
> is known ay compile time whay the variable is, hence unrolling the
> loop.

http://www.boost.org/libs/preprocessor/doc/index.html

-cd

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Sven Groot - 11 May 2004 23:43 GMT

>> would it be possible to sort of engineer some sort of preprocessor
>> macro that does a 'for' loop.
[quoted text clipped - 3 lines]
>
> http://www.boost.org/libs/preprocessor/doc/index.html

Doesn't VC already do this with a normal for-loop when optimising for speed,
the number of iterations can be determined at compile time, and the amount
of inserted code is reasonable small?

I'm certain I've come across a compiler that did that, but I can't remember
for certain if VC does it though...

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Sven Groot

http://unforgiven.bloghorn.com

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Carl Daniel [VC++ MVP] - 11 May 2004 23:46 GMT

>>> would it be possible to sort of engineer some sort of preprocessor
>>> macro that does a 'for' loop.
[quoted text clipped - 10 lines]
> I'm certain I've come across a compiler that did that, but I can't
> remember for certain if VC does it though...

I'm not sure if VC does automatic loop unrolling, but there definitely are
compilers that do so.

-cd

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"FOR" in preprocessor macro

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