http://d.puremagic.com/issues/show_bug.cgi?id=2876

           Summary: suggest keyword:auto return
           Product: D
           Version: unspecified
          Platform: PC
        OS/Version: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: www.digitalmars.com
        AssignedTo: bugzilla@digitalmars.com
        ReportedBy: galaxylang@gmail.com


I'm interest in D's metaprogram,surely D is the most powerful language now. However when i write D program,i found if we can program by this way:

auto ReturnStatic(int i)(int a)
{
   int f1(int b){return a+b;}
   double f2(double c){return c+a;}
   static if(i==0){return &f1;}
   else return &f2;
}

this will be great enhance the language power


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http://d.puremagic.com/issues/show_bug.cgi?id=2876





------- Comment #1 from fvbommel@wxs.nl  2009-04-22 07:56 -------
*** Bug 2877 has been marked as a duplicate of this bug. ***


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http://d.puremagic.com/issues/show_bug.cgi?id=2876


fvbommel@wxs.nl changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|suggest keyword:auto return |suggest keyword:auto return




------- Comment #2 from fvbommel@wxs.nl  2009-04-22 07:57 -------
Isn't this already implemented (in D2)?


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http://d.puremagic.com/issues/show_bug.cgi?id=2876


Brad Roberts <braddr@puremagic.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |braddr@puremagic.com
           Platform|x86                         |All
            Version|unspecified                 |future
            Summary|suggest keyword:auto return |Enhancement to 'auto'
                   |                            |return
         OS/Version|Windows                     |All
           Severity|normal                      |enhancement




--- Comment #3 from Brad Roberts <braddr@puremagic.com>  2009-06-08 01:08:39 PDT ---
I doubt the current auto return deduction could handle this code, but I haven't tried it.

Changing it to an enhancement request for a future version.

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Witold Baryluk <baryluk@smp.if.uj.edu.pl> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |baryluk@smp.if.uj.edu.pl
         Resolution|                            |WORKSFORME


--- Comment #4 from Witold Baryluk <baryluk@smp.if.uj.edu.pl> 2009-12-26 18:52:06 PST ---
I don't see any problem with this example. It is quite simple to compile, and
in fact it works in DMD 2.037 as desired. This example uses three things which
are fully supported:
 - static if over template parameters, no problem for long time
 - coping/allocating variable on heap if they are used in delegate (or nested
functions) and returned from function (escaping scope), no problem in most
cases
 - infering return type, no problem as we have exactly one return (after static
if selection), and its type is quite "simple"  (it is delegate int(int), or
delegate float(float)), and compiler knows this.


Please close this bug with WORKSFORME.

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