http://d.puremagic.com/issues/show_bug.cgi?id=6910
Summary: __traits(hasMember, "<name>") does not work, if
template has alias param
Product: D
Version: D2
Platform: x86_64
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: DMD
AssignedTo: nob...@puremagic.com
ReportedBy: tob...@pankrath.net
--- Comment #0 from Tobias Pankrath <tob...@pankrath.net> 2011-11-08 14:29:58
PST ---
Given this code fragment:
--------------
struct Bag(S...)
{
����alias S Types;
}
template Test(alias i, B)
{
����void fn() {
��������foreach(t; B.Types)
��������{
������������switch(i) {
����������������case IndexOf!(t, B.Types):
����������������{
��������������������pragma(msg, __traits(allMembers, t));
��������������������pragma(msg, __traits(hasMember, t, "m"));
��������������������break;
����������������}
����������������default: {}
������������}
��������}
����}
}
struct A
{
����int m;
}
void main()
{
����int i;
����alias Test!(i, Bag!(A)).fn func;
}
----------------------
DMD will output:
----------------------
tuple("m")
false
---------------------
It seems that __traits(hasMember, ..) evaluates to false, despite the fact that
the type
does have a member "m". However if the template Test does not have an alias
parameter, everything will work just fine.
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