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digitalmars.D.bugs - [Issue 11582] New: inherit element/slice of type tuple

reply d-bugmail puremagic.com writes:
https://d.puremagic.com/issues/show_bug.cgi?id=11582

           Summary: inherit element/slice of type tuple
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: luis luismarques.eu



---
This gives an error:

    class C(E...) : E[0] 
    {
    }

Error: members expected
Error: { } expected following aggregate declaration

Inheriting from all the types in the type tuple is OK:

    class C(E...) : E
    {
    }

Workaround:

    template C(E...)
    {
        alias T = E[1..$];

        class C : T
        {
        }
    }

This seems somewhat similar to Issue 11581

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Nov 22 2013
next sibling parent d-bugmail puremagic.com writes:
https://d.puremagic.com/issues/show_bug.cgi?id=11582


monarchdodra gmail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |monarchdodra gmail.com





 This gives an error:
 
     class C(E...) : E[0] 
     {
     }
 
 Error: members expected
 Error: { } expected following aggregate declaration

 ...

 Workaround:


Another one, which might be "cleaner" depending on how you are actually using
E:
//----
class C(Base, E...) : Base
{}
//----

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prev sibling next sibling parent d-bugmail puremagic.com writes:
https://d.puremagic.com/issues/show_bug.cgi?id=11582






 This gives an error:
 
     class C(E...) : E[0] 
     {
     }
 
 Error: members expected
 Error: { } expected following aggregate declaration


This is syntactic issue. Currently class declaration grammar is defined as
follows:

----
ClassDeclaration:
    class Identifier BaseClassListopt ClassBody
    ClassTemplateDeclaration

BaseClassList:
    : SuperClass
    : SuperClass , Interfaces
    : Interfaces

SuperClass:
    Identifier
----

SuperClass should be Identifier, so it does not accept E[0].

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Nov 22 2013
prev sibling parent d-bugmail puremagic.com writes:
https://d.puremagic.com/issues/show_bug.cgi?id=11582


yebblies <yebblies gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |yebblies gmail.com



Actually, parseBaseClasses uses parseBasicType.  This was to include things
like typeof.

class A {}
A a;
class B : typeof(a) {}

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Nov 23 2013