#define CTRL(x) followup

[Arthur David Olson]

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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