• d-bugmail puremagic.com Jun 19 2009
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d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=3081

           Summary: unaryFun can't be used to get element out of struct
           Product: D
           Version: 2.030
          Platform: Other
        OS/Version: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Phobos
        AssignedTo: nobody puremagic.com
        ReportedBy: dsimcha yahoo.com


import std.algorithm;

struct Foo {
    uint num;
}

void main() {
    Foo[] foos;
    auto bar = map!("a.num")(foos);
}

C:\dmd\windows\bin\..\..\src\phobos\std\functional.d(89): Error: static assert 
"Bad unary function: a.num for type Foo"

This looks like overzealous error checking, as it worked in the old Phobos and
now fails a static assert.  Probably has to do with the fact that Foo is in a
different module than std.functional.unaryFun.

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d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=3081


Jarrett Billingsley <jarrett.billingsley gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jarrett.billingsley gmail.c
                   |                            |om




--- Comment #1 from Jarrett Billingsley <jarrett.billingsley gmail.com> 
2009-06-19 09:51:18 PDT ---
To whom it may concern: would an "I told you so" dance here be appropriate?  ;)

String mixins are cute, but we need actual macros to be able to do things like
this more generally.

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--- Comment #2 from Jarrett Billingsley <jarrett.billingsley gmail.com> 
2009-06-19 10:21:55 PDT ---
(In reply to comment #1)
 To whom it may concern: would an "I told you so" dance here be appropriate?  ;)
 
 String mixins are cute, but we need actual macros to be able to do things like
 this more generally.


For those interested, the cause really _is_ because Foo is defined in a
different module.  The unaryFun template fails because ElementType.stringof
yields "Foo", which isn't visible to std.functional.  Even if it could compile
the lambda func, the "alias typeof(mixin(testAsExpression))" line still fails
because again, Foo is not accessible.

That it uses ElementType.stringof also means that it will fail for just about
anything other than the builtin types.

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d-bugmail puremagic.com writes:

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Max Samukha <samukha voliacable.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |samukha voliacable.com




--- Comment #3 from Max Samukha <samukha voliacable.com>  2009-06-20 02:56:29
PDT ---
Yeah, .stringof shouldn't be used there. But we still can get to the type
through the alias. Changing the mixin string to
enum testAsExpression = "{ ElementType "~parmName~"; return ("~fun~");}()"; 
should fix the bug.

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--- Comment #4 from Jarrett Billingsley <jarrett.billingsley gmail.com> 
2009-06-20 10:13:42 PDT ---
(In reply to comment #3)
 Yeah, .stringof shouldn't be used there. But we still can get to the type
 through the alias. Changing the mixin string to
 enum testAsExpression = "{ ElementType "~parmName~"; return ("~fun~");}()"; 
 should fix the bug.


I can confirm that does work.

That being said, the amount of acrobatics that had to be performed to make the
templates involved not directly refer to the type at hand is somewhat
frightening.  It reminds me of implementing something by using lambdas several
layers deep.  This stuff probably has a limit, if not in what it can do, then
in the cognitive load on the programmers using it.  Too bad macros were
scrapped for D2, huh?

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--- Comment #5 from Max Samukha <samukha voliacable.com>  2009-06-20 12:18:39
PDT ---
Bad enough

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Andrei Alexandrescu <andrei metalanguage.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |andrei metalanguage.com
         Resolution|                            |FIXED




--- Comment #6 from Andrei Alexandrescu <andrei metalanguage.com>  2009-07-03
23:24:17 PDT ---
Fixed, will come with the next release.

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Walter Bright <bugzilla digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bugzilla digitalmars.com




--- Comment #7 from Walter Bright <bugzilla digitalmars.com>  2009-07-09
02:57:27 PDT ---
Fixed dmd 2.031

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