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digitalmars.D.bugs - [Issue 6080] New: Statically constructed Structs - Constructor/Initialization ambiguity

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=6080

           Summary: Statically constructed Structs -
                    Constructor/Initialization ambiguity
           Product: D
           Version: unspecified
          Platform: x86_64
        OS/Version: Linux
            Status: NEW
          Severity: major
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: daniel350 bigpond.com


--- Comment #0 from Daniel <daniel350 bigpond.com> 2011-05-31 02:24:08 PDT ---
SO Question:
http://stackoverflow.com/questions/6184422/ambiguous-struct-constructors-in-d
Source example: http://www.pastie.org/1997238
Actual Output: 5,3 2,8 2,10
Expected Output: 2,10 2,8 2,10

If the above doesn't provide all the information, then I'll summarize:

Statically constructed structs are defaulting to the parameter list
initialization instead of using a constructor.

I'm to assume this is a bug, and possibly a flaw in ambiguity, at least a
warning should be displayed.

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--- Comment #1 from Daniel <daniel350 bigpond.com> 2011-05-31 02:24:56 PDT ---
And, it should be consistent between statically defined and locally defined
structs?

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

           What    |Removed                     |Added
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                 CC|                            |andrej.mitrovich gmail.com


--- Comment #2 from Andrej Mitrovic <andrej.mitrovich gmail.com> 2011-05-31
03:07:51 PDT ---
A similar bug, but for enums, is reported in issue 5460.

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bearophile_hugs eml.cc changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bearophile_hugs eml.cc


--- Comment #3 from bearophile_hugs eml.cc 2011-05-31 04:13:00 PDT ---
Please, don't link code that's in external paste sites, because their pages are
often ephemeral. The code, with small changes:


import core.stdc.stdio: printf;

struct Foo {
    int a = 2;
    int b = 3;

    this(int c) {
        a = c / 2;
        b = c * 2;
    }

    this(float c) {
        a = cast(int) c / 2;
        b = cast(int) c * 2;
    }

    static Foo F1 = Foo(4.3);
    static Foo F2 = Foo(5);
}

void main() {
    printf("%d %d\n", Foo.F1.a, Foo.F1.b); // 2 8
    printf("%d %d\n", Foo.F2.a, Foo.F2.b); // 5 3

    Foo F3 = Foo(5);
    printf("%d %d\n", F3.a, F3.b); // 2 10
}

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--- Comment #4 from Daniel <daniel350 bigpond.com> 2011-05-31 16:32:01 PDT ---
Thanks for simplifying it mate.

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