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digitalmars.D.bugs - [Issue 3790] New: [OOP] constructor of child class cannot pass arguments into parent constructor

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=3790

           Summary: [OOP] constructor of child class cannot pass arguments
                    into parent constructor
           Product: D
           Version: 2.041
          Platform: x86_64
        OS/Version: Linux
            Status: NEW
          Severity: blocker
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: denis.tomilin gmail.com


--- Comment #0 from iorlas <denis.tomilin gmail.com> 2010-02-09 18:16:32 PST ---
Constructor of child class cannot pass arguments into parent constructor.
See the example:

class A{
 final this(int a=0){
  writeln(a);
 }
}
class B:A{
}

B b = new B(); //prints 0
B b2 = new B(2); //throws an error "expected 0 arguments, not 1..."

As we can see, logic is normal, but not in dmd. This bug creates a new bug:

class A{
 final this(int a=0){
  writeln(a);
 }
}
class B:A{
 this(int a=0){ //compiler perfectly, but parent constructor marked as "final"
  super(a);
 }
}

It might be not a hard problem, but it will be good for my project to create a
logical, nice-look code.

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next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=3790



--- Comment #1 from iorlas <denis.tomilin gmail.com> 2010-02-09 20:05:05 PST ---
Also, if we dont give argument a default value, we get an error:
Error: constructor main.B.this no match for implicit super() call in
constructor
As i think, somebody thinks in different way with a lot of stones and problems
=/

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prev sibling next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=3790


Don <clugdbug yahoo.com.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |clugdbug yahoo.com.au
           Severity|blocker                     |enhancement


--- Comment #2 from Don <clugdbug yahoo.com.au> 2010-11-12 05:03:07 PST ---
This bug report has two issues:
(1) an enhancement request: allow constructors to be inherited.
and
(2) an accepts-invalid bug: 'final this()' is accepted, even though this() is
_always_ final.

Downgrading to enhancement.

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prev sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=3790


Brad Roberts <braddr puremagic.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Platform|x86_64                      |x86


--- Comment #3 from Brad Roberts <braddr puremagic.com> 2011-02-06 15:40:22 PST
---
Mass migration of bugs marked as x86-64 to just x86.  The platform run on isn't
what's relevant, it's if the app is a 32 or 64 bit app.

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