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digitalmars.D.bugs - [Issue 8256] New: mixin() doesn't work in a template declaration

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=8256

           Summary: mixin() doesn't work in a template declaration
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: wfunction hotmail.com


--- Comment #0 from wfunction hotmail.com 2012-06-16 17:53:32 PDT ---
string getTypeName() { return "int"; }

template Foo(T = mixin(getTypeName())) { }

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Jun 16 2012
next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=8256


Kenji Hara <k.hara.pg gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |enhancement


--- Comment #1 from Kenji Hara <k.hara.pg gmail.com> 2012-06-17 00:22:55 PDT ---
This is not allowed in current spec.

http://dlang.org/expression.html#MixinExpression

MixinExpression is an expression, not a type.

template Foo(T = mixin(getTypeName())) { }
                 ^
                 There should be a type.

And the text contents of the string must be compilable as a valid
AssignExpression.

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Jun 17 2012
prev sibling next sibling parent d-bugmail puremagic.com writes:
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--- Comment #2 from wfunction hotmail.com 2012-06-17 01:37:22 PDT ---
Oh hmm, I see... any chance that it might be allowed at some point? :D

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--- Comment #3 from Kenji Hara <k.hara.pg gmail.com> 2012-06-17 02:05:15 PDT ---
Workaround(not tested):

template Foo(T = typeof(mixin(getTypeName()).init)) { }

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--- Comment #4 from wfunction hotmail.com 2012-06-17 02:12:42 PDT ---
Oh cool, that works! Thanks!

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