Fully dynamic d by opDotExp overloading

[davidl]

在 Fri, 17 Apr 2009 23:20:53 +0800，davidl <davidl at nospam.org> 写道:

> 在 Fri, 17 Apr 2009 22:24:04 +0800，Steven Schveighoffer  
> <schveiguy at yahoo.com> 写道:
>
>> On Fri, 17 Apr 2009 09:44:09 -0400, Leandro Lucarella  
>> <llucax at 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";

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