ado@elsie.UUCP (Arthur David Olson) (11/01/86)
Thanks to everyone who replied to my question on whether an emulation of
Reiser cpp's handling of
#define CTRL(x) ('x' & 037)
could be done in tentative proposed draft ANSI C.
The consensus is that the closest one came come is
#define CTRL(x) (#x[0] & 037)
with, perhaps, a "const" cast of appropriate type thrown in to allow for uses
such as
...
switch (input_char) {
case CTRL(z): stop();
...
And an idea for consideration: "lint" now reports on function arguments that
are not used; if it were extended to report on macro arguments that were not
used, then old, Reiser-style constructs such as
#define CTRL(x) ('x' & 037)
would result in "lint" warnings.
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