[Issue 12347] New: adjoin!SingleFun does not return a tuple

[d-bugmail at puremagic.com]

https://d.puremagic.com/issues/show_bug.cgi?id=12347

           Summary: adjoin!SingleFun does not return a tuple
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Phobos
        AssignedTo: nobody at puremagic.com
        ReportedBy: monarchdodra at gmail.com


--- Comment #0 from monarchdodra at gmail.com 2014-03-11 04:26:40 PDT ---
It simply aliases to SingleFun.

While it sounds like a good idea on paper, in practice, it is actually
counter-productive:

In non-generic code, no-one will use adjoin for a single function.
In generic code, it becomes counter productive, since the caller will have to
explicitly handle single arg cases, since the result can't be statically
indexed or iterated on. This *forces* the user to handle it explicitly in a
different branch.

Given the design, we might as well return a tuple: Then the user *may* handle
it differently, if he so wishes, but it will still work even without special
handling.

Also, it goes against documentation. The documentation states that a tuple is
returned.

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