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digitalmars.D.bugs - [Issue 4273] New: Error: functions cannot return a tuple

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=4273

           Summary: Error: functions cannot return a tuple
           Product: D
           Version: 2.040
          Platform: x86
        OS/Version: Mac OS X
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: sean invisibleduck.org


--- Comment #0 from Sean Kelly <sean invisibleduck.org> 2010-06-04 16:24:41 PDT
---
If line A is changed to "auto x = foo(1,2);" then the code compiles without
incident.  This should compile with one parameter as well.

   import std.typecons;

   template fooRet(T...)
   {
       static if( T.length == 1 )
           alias T fooRet;
       else
           alias Tuple!(T) fooRet;
   }

   fooRet!(T) foo(T...)(T vals)
   {
       Tuple!(T) ret;
       static if( T.length == 1 )
           return ret.field[0];
       else
           return ret;
   }

   void main()
   {
       auto x = foo(1); // A
   }

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next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=4273


bearophile_hugs eml.cc changed:

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


--- Comment #1 from bearophile_hugs eml.cc 2010-06-04 16:55:10 PDT ---
I don't understand the purpose of your code, but I think the problems are in
your code.

Maybe in fooRet you meant to use:
alias T[0] fooRet;

You can also use:
auto foo(T...)(T vals)

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--- Comment #2 from Walter Bright <bugzilla digitalmars.com> 2010-06-04
17:16:41 PDT ---
"Fixing" this would require conflating a Tuple!(T) with T. I think this would
be a mistake.

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prev sibling next sibling parent d-bugmail puremagic.com writes:
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Walter Bright <bugzilla digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |bugzilla digitalmars.com
         Resolution|                            |WONTFIX


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--- Comment #3 from Sean Kelly <sean invisibleduck.org> 2010-06-04 18:21:00 PDT
---
You're right, it was a mistake in my code.  Sorry.

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