I added some code to make this work:
////////////////////////////
#import <flx.flxh>
_tokdef mymac = 1,2 _edef
val x = mymac;
print x.(0); print " "; print x.(1); endl;
/////////////////////////////
The construction
_tokdef ident = token ... _edef
defines ident to be the list of tokens after the = sign,
and prior to the word '_edef'. Whenever such a name is
seen, it is replaced by its definition, so
val x = mymac;
expands to
val x = 1,2;
This processing is done BEFORE parsing. The scan for
a _tokdef is not expanded, however when a name is replaced
by a token list, the list is pushed back into the input
and rescanned.
This feature can be used to work around the fact the
syntax preserving macro processor cannot expand all
Felix constructions: it works with expressions, statements
and types, but not in other places such as parameter lists,
even though these are well formed subtrees.
I implement this so I could write:
_tokdef mints = tint, short, int, long, vlong;
ctypes mints;
typedef ints = typesetof (mints);
for val t in (mints) do open Eq[t]; done;
without having to repeat the list of types.
Definitions are scoped over the whole token stream.
Try to avoid this feature!! It is basically a slightly
better version of C macro processing, and thus has
all the problems of such systems. I will, however,
enrich it so it can do a bit more than just simple
name replacement.
--
John Skaller <skaller at users dot sf dot net>
Felix, successor to C++: http://felix.sf.net
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