Why all this fuss about CTRL(X) ??

[Michael Meissner]

In article <1971 at emory.UUCP> arnold at emory.UUCP (Arnold D. Robbins {EUCC}) writes:
> I hope somebody hasn't beat me to this. The whole fuss about
>
> #define CTRL(X)	('X' & 037)	/* ascii! */
>
> in the Reiser cpp not being doable in ANSI C can be answered this way:
>
> #define CTRL(X)	(' ## X ## ' & 037)	/* ascii only */
>
> which uses the token concatenation operator to produce the character
> constant. ....

This will not work with the ANSI preprocessor, because the ANSI preprocessor
only deals with tokens, not atoms (except for string-izing).  The above
would try to create a character constant with 8 characters in it.

-- 
	Michael Meissner, Data General
	...mcnc!rti-sel!dg_rtp!meissner