[Issue 3072] tuples can't be aliases ( except when the aliases are templates. )
d-bugmail at puremagic.com
d-bugmail at puremagic.com
Wed Oct 20 11:00:36 PDT 2010
http://d.puremagic.com/issues/show_bug.cgi?id=3072
Rob Jacques <sandford at jhu.edu> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |accepts-invalid,
| |rejects-valid, spec
CC| |sandford at jhu.edu
Version|1.00 |D1 & D2
Summary|tuples can't be aliases |tuples can't be aliases (
| |except when the aliases are
| |templates. )
--- Comment #1 from Rob Jacques <sandford at jhu.edu> 2010-10-20 10:59:44 PDT ---
In general template tuples can't contain alias template parameters but it
appears that there is an exception to this rule when the parameter is itself a
template.
DMD 2.049
T foo(T)(T t) { return t; }
template map1(fun...) {
enum map1 = 42;
}
template map2(T, U...) {
static if(U.length > 0) enum map2 = map2!(U);
else enum map2 = 42;
}
void main() {
auto x = map1!(char,foo); // compiles
auto y = map2!(char,foo); // doesn't compile
auto z = map1!(char,map1); // compiles
auto w = map2!(char,map1); // doesn't compile
return;
}
I've added the accepts-invalid, rejects-valid and spec keywords, since tuples
of aliases should either work or not-work and the behavior should be documented
in the spec. I'd lean towards not-work, since tuples of aliases seem to be
buggy (i.e. Issue 5087) not to mention that alias parameters are buggy(i.e.
issue 5082)
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