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digitalmars.D.bugs - [Issue 4855] New: When a class has private override member function, the function requires no return value type

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=4855

           Summary: When a class has private override member function, the
                    function requires no return value type
           Product: D
           Version: D2
          Platform: Other
        OS/Version: Windows
            Status: NEW
          Keywords: accepts-invalid
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: rayerd.wiz gmail.com


--- Comment #0 from Haruki Shigemori <rayerd.wiz gmail.com> 2010-09-12 07:09:36
PDT ---
import std.stdio;
class Base
{
        int f() {return 0;}
}
class Derived : Base
{
        private override /+int+/ f() {return 1;} // accepts-invalid
}

void main()
{
}

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next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=4855


bearophile_hugs eml.cc changed:

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


--- Comment #1 from bearophile_hugs eml.cc 2010-09-12 07:59:36 PDT ---
I agree this looks a bit strange, and it may even lead to a few bugs, but here
DMD is acting as designed, so it's not a true bug.

When you use enum, override and few other things, DMD performs type inference,
so the explicit return type is not necessary.

So I presume this bug may be closed.

(If you think this D characteristic is leads to many bugs then this bug report
may be kept open, despite the probability of seeing it fixed is low.)

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--- Comment #2 from Haruki Shigemori <rayerd.wiz gmail.com> 2010-09-12 09:55:48
PDT ---
Thank you for your reply.
If this characteristic is a design of DMD, I will close this bug report.
What do you think that both look like asymmetry?

import std.stdio;
class Base
{
    int f() {return 0;}
    int g() {return 0;}
}
class Derived : Base
{
    private override /+int+/ f() {return 1;} // accepts
    public  override /+int+/ g() {return 1;} // rejects
}
void main() {}

main.d(10): Error: function main.Derived.g of type () overrides but is not
covariant with main.Base.g of type int()
main.d(10): Error: function main.Derived.g does not override any function

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--- Comment #3 from bearophile_hugs eml.cc 2010-09-12 11:14:20 PDT ---
I don't know what's going on, but I suggest to keep this bug report open.

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Don <clugdbug yahoo.com.au> changed:

           What    |Removed                     |Added
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                 CC|                            |clugdbug yahoo.com.au


--- Comment #4 from Don <clugdbug yahoo.com.au> 2010-09-12 19:05:39 PDT ---
I think this is a duplicate of bug 3581.

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yebblies <yebblies gmail.com> changed:

           What    |Removed                     |Added
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             Status|NEW                         |RESOLVED
                 CC|                            |yebblies gmail.com
         Resolution|                            |DUPLICATE


--- Comment #5 from yebblies <yebblies gmail.com> 2012-01-30 16:53:57 EST ---
*** This issue has been marked as a duplicate of issue 3581 ***

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Jan 29 2012