http://d.puremagic.com/issues/show_bug.cgi?id=1364

           Summary: 2.003 traits within loop
           Product: D
           Version: 2.002
          Platform: PC
        OS/Version: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: bugzilla@digitalmars.com
        ReportedBy: Daniel919@web.de


import std.stdio;

class D
{
    this() { }
    ~this() { }
    void foo() { }
    int foo(int) { return 0; }
    int x;
}

void main()
{
        D d = new D;

        foreach (t; __traits(allMembers, typeof(d)))
                writefln(typeid(typeof(__traits(getMember, d, t))));
}


(17): Error: string expected as second argument


-- 

<d-bugmail@puremagic.com> wrote in message news:bug-1364-3@http.d.puremagic.com/issues/...
> http://d.puremagic.com/issues/show_bug.cgi?id=1364

>                writefln(typeid(typeof(__traits(getMember, d, t))));


Isn't that supposed to be __traits(getMember, d, "t") ?  Which entirely makes sense given the error message..

Reply to d-bugmail@puremagic.com,

> http://d.puremagic.com/issues/show_bug.cgi?id=1364
> 
> Summary: 2.003 traits within loop
> Product: D
> Version: 2.002
> Platform: PC
> OS/Version: Windows
> Status: NEW
> Severity: normal
> Priority: P2
> Component: DMD
> AssignedTo: bugzilla@digitalmars.com
> ReportedBy: Daniel919@web.de
> import std.stdio;
> 
> class D
> {
> this() { }
> ~this() { }
> void foo() { }
> int foo(int) { return 0; }
> int x;
> }
> void main()
> {
> D d = new D;
> foreach (t; __traits(allMembers, typeof(d)))
> writefln(typeid(typeof(__traits(getMember, d, t))));
> }
> (17): Error: string expected as second argument
> 

The issue might be that the foreach is a run time foreach and the inner __traits needs a string literal. Some sort of array-to-tuple magic is needed. This might end up looing somthing like this:

mixin(CTFEarrayToTuple(__traits(allMembers, typeof(d))))

http://d.puremagic.com/issues/show_bug.cgi?id=1364


Daniel919@web.de changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  BugsThisDependsOn|                            |1298




------- Comment #2 from Daniel919@web.de  2007-07-24 09:55 -------
@Nazo Humei: On IRC I was told it should work.
The foreach should be "expanded" at compile time to:
writefln(typeid(typeof(__traits(getMember, d, "foo"))));
writefln(typeid(typeof(__traits(getMember, d, "x"))));
...

This bug depends on #1298


-- 

http://d.puremagic.com/issues/show_bug.cgi?id=1364


bugzilla@digitalmars.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |INVALID




------- Comment #3 from bugzilla@digitalmars.com  2007-09-03 16:44 -------
The problem is that 't' is a runtime variable, not a string literal. When D gets a static foreach, this kind of program will work.


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