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digitalmars.D.bugs - [Issue 7809] New: __traits(getMember can be used with a type although the spec says it cannot

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=7809

           Summary: __traits(getMember can be used with a type although
                    the spec says it cannot
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: websites
        AssignedTo: nobody puremagic.com
        ReportedBy: simendsjo gmail.com



struct S {
  int i;
}

is( typeof(__traits(getMember, S, "i")) == int ) // works

The spec, on the other hand, says it cannot be used on non-static fields.
That's my interpretation.

http://dlang.org/traits.html#getMember

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parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=7809


Andrej Mitrovic <andrej.mitrovich gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |andrej.mitrovich gmail.com
         Resolution|                            |INVALID



12:52:23 PST ---
No, the error is in the assignment:

struct S
{
    int i;
}

void main()
{
    __traits(getMember, S, "i") = 1;
}

Error: need 'this' to access member i

The trait docs specifically state that all the trait does is forms an
expression. 

But I don't think we even need it anymore since we can use string mixins,
although it has to be around for backwards-compatibility.

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