[Issue 11616] New: Introduce virtual keyword and remove virtual-by-default

[d-bugmail at puremagic.com]

https://d.puremagic.com/issues/show_bug.cgi?id=11616

           Summary: Introduce virtual keyword and remove
                    virtual-by-default
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: preapproved
          Severity: enhancement
          Priority: P2
         Component: DMD
        AssignedTo: yebblies at gmail.com
        ReportedBy: yebblies at gmail.com


--- Comment #0 from yebblies <yebblies at gmail.com> 2013-11-27 23:27:49 EST ---
Thread with discussion and Walter-approval:

http://forum.dlang.org/thread/yzsqwejxqlnzryhrkfuq@forum.dlang.org?page=28#post-koqkhc:244nn:241:40digitalmars.com

1. Add warning for not marking a virtual method with 'virtual'
2. Deprecate not marking a virtual method with 'virtual'
3. Make it an error to not mark virtual methods with 'virtual'

At this point, all methods are marked with either 'virtual', 'final',
'abstract', or 'override' or are implicitly final. (eg template methods,
constructors)

4. Do not require 'final' to mark a function as final. (optional)

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