variadic (typesafe) args in DLL

[Bjoern]

Jarrett Billingsley schrieb:
> "Bjoern" <nanali at nospam-wanadoo.fr> wrote in message 
> news:foi37b$19vv$1 at digitalmars.com...
> 
>> export extern (Windows) uint BinaryOrPlus(uint...)
>> {
>>   uint result = _arguments[0];
>>   for (int i = 1; i < _arguments.length; i++)
>>   {
>>      result |= _arguments[i];
>>   }
>>   return result;
>> }
>>
>> Unfortunately Error msg is :
>>
>> C:\dmd\projects\bsdutil>dmd -profile -odc:\dmd\projects\bsdutil\obj -ofBSDUTIL.D
>> LL bsdutil.d demangle.d bsdutil.def
>> bsdutil.d(110): Error: undefined identifier _arguments
>> bsdutil.d(110): Error: _arguments must be an array or pointer type, not 
>> int
> 
> Ur typesafe variadic function, ur doin it wrong.
> 
> You declare the typesafe variadic param as so:
> 
> uint BinaryOrPlus(uint[] vals...)
> 
> then just use vals.

How to iterate over vals  ?

> 
> Typesafe variadic params are just sugar for passing an array literal.  In 
> fact you can also pass an array reference in place of a list of params.
> 
> To that end, unless 4GL supports passing D arrays, you're going to have to 
> do something else. 

I can only use C style fixed arrays but this will end in code like
arr is fixed array on 3 uint = [WS_HONK, WS_TONK, WS_ITCH]
so, no win for me
> 
> 

okay let's forget about "typesafe" I can manage this in 4GL code, 
however following the D guidelines this should work :

export extern (Windows) uint BinaryOrPlus(uint firstarg, ...)
{
   uint result = firstarg; //_arguments[0];
   for (int i = 1; i < _arguments.length; i++)
   {
      result |= *cast(uint *)_argptr;
         _argptr += uint.sizeof;
   }
   return result;
}

In fact it don't work and it is looks dirty. they question here is ; 
what is the matter with _arguments /// using Tango

Thanks for spending your time
Bjoern