On Mon, Mar 13, 2000 at 05:28:47PM +1100, Bruce Evans wrote:
...
>
> I would prefer standard maxof() and minof() interfaces that work on
> any arithmetic type. These can almost be written in portable C, at
> least in C89 where types are restricted to char, signed char, ...,
> long double:
>
> #define isfloat(type) ((type)0.5 != 0)
> #define issigned(type) ((type)-1 < 0)
> #define isschar(type) (!isfloat(type) && issigned(type) && sizeof(type) == 1)
> #define isuchar(type) (!isfloat(type) && !issigned(type) && sizeof(type) == 1)
> ...
> #define maxof(type) ((type)(isschar(type) ? SCHAR_MAX :
> isuchar(type) ? UCHAR_MAX ...))
This is marvellous in it's simplicity of interface.
Yet, using sizeof(char) and assuming that it's going to be 1, strikes me
like a dangerous thing to do. I have never heard of machines where this
isn't true, but I seem to recall that the comp.lang.c FAQ mentions this
somewhere. I'll look it up tomorrow, since it's getting too late..
- Giorgos Keramidas
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