drw@cullvax.UUCP (Dale Worley) (08/11/87)
allbery@ncoast.UUCP (Brandon S. Allbery) writes:
- The reason for this is that I have a cpp macro which provides function proto-
- types under ANSI C and omits them for old-fashioned C. Example:
-
- DEFUN(extern generic malloc, (unsigned));
-
- becomes
-
- extern generic malloc(unsigned);
[Under ANSI C he writes:]
- #define DEFUN(fn,proto) fn##proto
-
- It assumes that X3J11 is #defined by ANSI C (wrong, I'm certain) and that the
- concatenation operator is ## (I think this is right). (Purists would argue
- that ## isn't needed; but I have a thing about "xx (yy)" as a function defi-
- nition; I want to search for functions with "xx(" and C control structures
- (if, while, switch) with "xx (".)
You'll lose big if you try this! The reason is that the ## operator
concatenates the character representation of the two surrounding
tokens to form what must be the character representation of a token.
Calling DEFUN(func,(a,b)) tries to concatenate the two tokens "func"
and "(", which together don't form a token.
Dale
--
Dale Worley Cullinet Software ARPA: cullvax!drw@eddie.mit.edu
UUCP: ...!seismo!harvard!mit-eddie!cullvax!drw
OS/2: Yesterday's software tomorrow Nuclear war? There goes my career!allbery@ncoast.UUCP (08/16/87)
As quoted from <1449@cullvax.UUCP> by drw@cullvax.UUCP (Dale Worley): +--------------- | allbery@ncoast.UUCP (Brandon S. Allbery) writes: | [Under ANSI C he writes:] | | - #define DEFUN(fn,proto) fn##proto | | You'll lose big if you try this! The reason is that the ## operator | concatenates the character representation of the two surrounding | tokens to form what must be the character representation of a token. | Calling DEFUN(func,(a,b)) tries to concatenate the two tokens "func" | and "(", which together don't form a token. +--------------- Ack, Phphhftht!!! Any votes for sanity? Orthogonality? (No, we vote for supporting TRSDOS 1.2)-; -- Brandon S. Allbery, moderator of comp.sources.misc and comp.binaries.ibm.pc {{harvard,mit-eddie}!necntc,well!hoptoad,sun!mandrill!hal}!ncoast!allbery ARPA: necntc!ncoast!allbery@harvard.harvard.edu Fido: 157/502 MCI: BALLBERY <<ncoast Public Access UNIX: +1 216 781 6201 24hrs. 300/1200/2400 baud>> ** Site "cwruecmp" is changing its name to "mandrill". Please re-address ** *** all mail to ncoast to pass through "mandrill" instead of "cwruecmp". ***