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digitalmars.D.bugs - [Issue 5501] New: Variant wrongly assumes that an object's length property returns a size_t

reply d-bugmail puremagic.com writes:
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           Summary: Variant wrongly assumes that an object's length
                    property returns a size_t
           Product: D
           Version: D2
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Phobos
        AssignedTo: nobody puremagic.com
        ReportedBy: dransic free.fr


--- Comment #0 from Nicolas Sicard <dransic free.fr> 2011-01-29 00:59:57 PST ---
The following code doesn't compile. I hit the problem when using
std.datetime.Interval (which length returns a Duration).

import std.variant;

struct Foo {
    double length() {
        return double.init;
    }
}

unittest {
    Foo foo;
    Variant v = foo;
}

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next sibling parent d-bugmail puremagic.com writes:
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Andrei Alexandrescu <andrei metalanguage.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
                 CC|                            |andrei metalanguage.com
         AssignedTo|nobody puremagic.com        |andrei metalanguage.com


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Andrei Alexandrescu <andrei erdani.com> changed:

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


--- Comment #1 from Andrei Alexandrescu <andrei erdani.com> 2013-01-08 01:13:47
PST ---
This is by design. The length name is special and defined to return size_t
compulsively. A possible solution would be to rename std.datetime.Interval.
Will cc jmdavis.

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prev sibling parent d-bugmail puremagic.com writes:
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--- Comment #2 from Nicolas Sicard <dransic gmail.com> 2013-01-08 01:22:43 PST
---
(In reply to comment #1)

 This is by design. The length name is special and defined to return size_t
 compulsively. A possible solution would be to rename std.datetime.Interval.
 Will cc jmdavis.


I agree. But that makes the length property a quasi-keyword and I think it
should be better documented, even if it is already used as such in practice.

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