fun with tuples/argument conversion function

[Daniel Keep]

Robert Fraser wrote:
> Heh; nice thinking there! Thanks!
> 
> BCS Wrote:
>> alternate between inType and outType
>>
>> void dTypesToJavaTypes(everything...)(everything stuff)
>> {
>>   foreach(i, thing, stuff)
>>   {
>>      static if(i & 0x01 == 0)
>>      {
>>         use stuff[i] and stuff[i+1]
>>      }
>>   }
>> }
>>
>>
>> nested templates:
>> template dTypes(InType...)
>> {
>>    void ToJavaTypes(OutType...)(InTypes..., OutTypes...)(InTypes inVars, 
>> out OutTypes outVars)
>>    {
>>       
>>    }
>> }
>>
>> dTypes!(int).ToJavaTypes!(Jint)(i, ji);
>>
>>
> 

The only other way I can think of doing it would be to make a template
that, given the D type expands to the JNI type.  So...

template jniType(T)
{
    static if( is( T == char[] ) )
        alias javaString jniType;
    else // ...
}

Then you need a template to apply this to a tuple...

template jniTypes(T, Ts...)
{
    alias Tuple!(jniType!(T), jniTypes!(Ts)) jniTypes;
}

And now you can do this:

void dTypesToJavaTypes(InTypes...)(InTypes inVars,
        out jniTypes!(InTypes) outVars)
{
    // Do stuff
}

It's messy, but the nice thing is that it makes your templates easier to
use.

That said, if you can get away with it, I'd go with BCS' approach. :)

	-- Daniel

-- 
int getRandomNumber()
{
    return 4; // chosen by fair dice roll.
              // guaranteed to be random.
}

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