http://d.puremagic.com/issues/show_bug.cgi?id=8635

           Summary: Allow postfix expressions for new
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: DMD
        AssignedTo: nobody@puremagic.com
        ReportedBy: timon.gehr@gmx.ch


--- Comment #0 from timon.gehr@gmx.ch 2012-09-09 07:35:29 PDT ---
New expressions should have support for postfixes, eg. like so:

class C{
    int x;
    this(int x)
    {
        this.x = x;
    }
}
void main()
{
    assert(new C(2).x==2);
    assert(new C(3).x==3);
}

Necessary grammar changes:

UnaryExpression:
    ...
    ( Type ) . Identifier
-   NewExpression
    ...

PrimaryExpression:
    ...
    ImportExpression
+   NewExpression
    BasicType . Identifier
    ...

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bearophile_hugs@eml.cc changed:

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                 CC|                            |bearophile_hugs@eml.cc


--- Comment #1 from bearophile_hugs@eml.cc 2012-09-09 07:50:29 PDT ---
This seems a nice idea.

See also: https://github.com/D-Programming-Language/dmd/pull/1111

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Jonathan M Davis <jmdavisProg@gmx.com> changed:

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                 CC|                            |jmdavisProg@gmx.com


--- Comment #2 from Jonathan M Davis <jmdavisProg@gmx.com> 2012-09-09 16:45:01 PDT ---
It already works if you use parens:

assert((new C(2)).x == 2);

I don't know if making it work without parens is a good idea or not, since I really don't know that the side effects of that would be.

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--- Comment #3 from bearophile_hugs@eml.cc 2012-09-09 17:49:31 PDT ---
(In reply to comment #2)

> I don't know if making it work without parens is a good idea or not, since I really don't know that the side effects of that would be.

I agree. If the side effects are bad, this bug report will be closed and future similar ideas will be marked as duplicates of this :-)

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--- Comment #4 from timon.gehr@gmx.ch 2012-09-09 18:08:59 PDT ---
There are no side effects. This just lifts a trivial restriction.

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Alex Rønne Petersen <alex@lycus.org> changed:

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                 CC|                            |alex@lycus.org


--- Comment #5 from Alex Rønne Petersen <alex@lycus.org> 2012-09-10 03:26:32 CEST ---
Also, it's how C# (and probably Java too) does it.

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--- Comment #6 from Jonathan M Davis <jmdavisProg@gmx.com> 2012-09-09 18:31:47 PDT ---
I have absolutely no problem with this as long as there are no side effects. I just had figured that there was a valid reason why the parens were required. It's often the case that something will seem like it should work and doesn't but has a very good reason for why it doesn't, even if it looks fine at first glance.

> Also, it's how C# (and probably Java too) does it.

Given D's increased complexity, it wouldn't surprise me at all if D couldn't do it when they could, but if it can, it definitely should as well. I think that it's the syntax that pretty much everyone tries at first - only to find that it doesn't work.

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--- Comment #7 from timon.gehr@gmx.ch 2012-09-09 18:40:01 PDT ---
(In reply to comment #6)
> I have absolutely no problem with this as long as there are no side effects. I just had figured that there was a valid reason why the parens were required. ...

Presumably it is just a C++ism that got carried over for no reason.

> Given D's increased complexity,

The D grammar is not particularly complex. (it is still somewhat more complex than it would need to be though.)

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Andrej Mitrovic <andrej.mitrovich@gmail.com> changed:

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                 CC|                            |wfunction@hotmail.com


--- Comment #8 from Andrej Mitrovic <andrej.mitrovich@gmail.com> 2012-12-08 15:10:55 PST ---
*** Issue 8116 has been marked as a duplicate of this issue. ***

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yebblies <yebblies@gmail.com> changed:

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                 CC|                            |aziz.koeksal@gmail.com


--- Comment #9 from yebblies <yebblies@gmail.com> 2013-01-08 12:08:11 EST ---
*** Issue 8826 has been marked as a duplicate of this issue. ***

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