On Thu, 2007-11-15 at 13:59 +0100, Ludovic Courtès wrote:
> Hi,
>
> Mike Gran <[EMAIL PROTECTED]> writes:
>
> > You are correct. There is a value in that macro called "_Complex_I" that
> > is, for some reason, being processed down to "__I", losing the word
> > "Complex".
>
> `Complex' in `_Complex_I' can't possibly be macro-expanded. There must
> be something else.
>
> Thanks for your help!
>
> Ludovic.
For what it's worth:
/usr/include/complex.h:
45 /*
46 * a constant expression of type const float _Complex with the
47 * value of the imaginary unit. (a number i such that i**2 =-1).
48 * __I is provided by the AIX xlc C99 compiler.
49 * WARNING: DO NOT USE __I DIRECTLY in an application. Always
50 * use _Complex_I .
51 */
52 #define _Complex_I __I
53
54 /*
55 * _Imaginary_I should be a constant expression of type
56 * const float _Imaginary with the value of the imaginary unit.
57 * This is optional in C99.
58 * This is not supported in the AIX xlc C99 compiler.
59 */
60
61 /*
62 * C99 requires this definition of the
63 * very common variable "I", to use as a simpler way
64 * to say _Complex_I. Mathematicians who would say
65 * "3i" will now say in C "3 * I".
66 */
67 #undef I
68 #define I _Complex_I
69
Could line 52 be expanded/dereferenced by cpp to make _Complex_I resolve
as __I?
--
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/* Kevin Brott <[EMAIL PROTECTED]>
* Unix Systems Engineer - SA Group - Provtech
* Providence Health Systems, Tigard, OR
*/
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