Re: [GD-Windows] Compiler code gen

[Brett B. <res...@ga...>]

Doh! Not very many holes, but one new one.  My gripe with CodeWarrior is 
that it recognizes the float being passed and promotes it to double from the 
caller, then I try to retrieve it with the type float and obviously it knows 
that it must promote that to double but doesn't.  I'm not sure it's a 
standard problem as much as their implementation of the va_arg function.
Brett

----- Original Message ----- 
From: "Jon Watte" <hp...@mi...>
To: <gam...@li...>
Sent: Wednesday, December 01, 2004 6:06 AM
Subject: RE: [GD-Windows] Compiler code gen


>
>> I guess his point is that va_arg(ap, float) as defined is always going to
> do
>> the wrong thing because variable argument lists can never contain floats.
> I
>> don't know how that could be fixed, considering that va_arg() is
> essentially
>> a macro hack created to avoid adding language constructs.
>
> In C++, you could catch that use with a compile-time assert.
>
> In both C and C++ you can actually pass floats by using unions, and/or
> type punning. Thus, being able to specify float as the argument for
> va_arg() isn't entirely useless -- but, as many things, may cause hole
> in the feet of previously inexperienced programmers.
>
> Corollary: experience is directly proportional to the number of holes
> in your feet, thus more experienced programmers walk slower.
>
> Cheers,
>
> / h+
>
>
>
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