Fully dynamic d by opDotExp overloading

[Denis Koroskin]

On Fri, 17 Apr 2009 13:25:45 +0400, Andrei Alexandrescu <SeeWebsiteForEmail at erdani.org> wrote:

> davidl wrote:
>> After tweaking dmd a bit litte, i get the dotexp overloading work.
>>  The following is the test code:
>> import std.stdio;
>> class c
>> {
>>      B opDotExp(char[] methodname,...)
>>     {
>>         writefln("god it works ", methodname);
>>       return new B();
>>     }
>>     void opAdd(int j)
>>     {
>>      }
>>     void test()
>>     {
>>     }
>> }
>>  class a:c
>> {
>>  }
>>  class B
>> {
>>   int i;
>>   B opAssign(int k){
>>     i=k;
>>     return this;
>>   }
>> }
>>  char[] v1;
>>  void func(char[] v, ...){}
>>  void main()
>> {
>>    a v=new a;
>>    v.test();
>>    v.dynamicmethod(3,4);
>>    //v.qq = 5;
>>    writefln((v.qq = 5).i);
>> }
>>  it generates the output:
>> god it works dynamicmethod
>> god it works qq
>> 5
>>  Any comments? Do you like this feature?
>>
>
> Cool! I suggest the rewrite:
>
> c.unknownmethod(args) -> c.opDotExp!("unknownmethod")(args)
>
> That way you have the option of handling the method name statically or  
> dynamically.
>
>
> Andrei

Yes, this also helps to catch errors at compile-time (like, dynObject.lenght vs dynObject.length).