• d-bugmail puremagic.com (35/35) Mar 31 2012 http://d.puremagic.com/issues/show_bug.cgi?id=7805

d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=7805

           Summary: "static" allows free templated functions to accept
                    struct fields as template alias parameters
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: thecybershadow gmail.com


--- Comment #0 from Vladimir Panteleev <thecybershadow gmail.com> 2012-03-31
07:20:50 PDT ---
//static
string f(alias X)()
{
    return null;
}

struct S
{
    int i;
    mixin(f!i());
}

This program doesn't compile, however uncommenting "static" makes it work.

DMD 2.058 produces this error message:

test.d(8): Error: struct test.S no size yet for forward reference

DMD git produces a different error message:

test.d(2): Error: function test.S.f!(i).f need 'this' to access member f

Note that fixing this issue by making both cases fail to compile would break
code. I believe the Orange serialization library uses this trick to stringify
field names with minimal syntax overhead.

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