Re: Compiler code gen

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" <[email protected]>
To: <[email protected]>
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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