在 Fri, 17 Apr 2009 23:34:37 +0800，Steven Schveighoffer
<schvei...@yahoo.com> 写道:
On Fri, 17 Apr 2009 11:27:57 -0400, davidl <dav...@nospam.org> wrote:
在 Fri, 17 Apr 2009 23:20:53 +0800，davidl <dav...@nospam.org> 写道:
在 Fri, 17 Apr 2009 22:24:04 +0800，Steven Schveighoffer
<schvei...@yahoo.com> 写道:
On Fri, 17 Apr 2009 09:44:09 -0400, Leandro Lucarella
<llu...@gmail.com> wrote:
I don't fully understand the example though. In writefln((v.qq =
5).i),
how is that B.i is assigned to 5 if the opDotExp("qq", 5) don't
propagate
the 5 to the new B()?
I think it translates to
opDotExp("qq") = 5
Without knowing the signature of qq, how is the compiler supposed to
infer that it is a property? In fact, I think this might be a
limitation of this syntax, you can't define dynamic properties.
I for one, can't really see a huge benefit, but then again, I don't
normally work with dynamic-type langauges. It looks to me like a
huge hole that the compiler will ignore bugs that would have been
caught if the methods were strongly typed:
Actually this can help ddl project to work more nicely. Consider you
can call plugin code directly without static bindings. And I believe
delphi COM variant use some similar trick. It allows you call COM
object without static bindings. Sometimes it's troublesome to get the
static bindings, and you only need one piece of little function(you
won't need the whole interface).
DDBI can also benefit from it.
Consider the use case:
myRow.Col1 = "abc";
Yes, this case does make sense, but I would still probably rather write
a statically-typed wrapper.
Plus it's not terribly hard to write:
myRow.set("Col1", "abc");
I'm not yet convinced, but it remains to be seen if there is some killer
functionality that cannot be had without it.
-Steve
Actually in a lot cases, you don't have the time to write the static
wrapper.
Also for a COM object, you don't want to call it in such ways:
comobj.callfunc("ComObjFunc", 3,4,5);
You probably want to call it only by comobj.ComObjFunc(3,4,5);
Yes static wrapper can solve these all. Problem is not in all cases you
want to make a static binding for it.
--
使用 Opera 革命性的电子邮件客户程序: http://www.opera.com/mail/
