Fair enough, if you wrap the C-API in C++ this can get quite neat. And
having myself pushed the documentation of the Julia C-API I definately
think that Julia's CAPI is quite good. My intention at that time was,
however, embedding Julia in C, in which case the C-API is definately
required.
So, it seems that you know what you are doing and for a C++ library the
answer might not be as simple as "do it using ccall in Julia".
I would welcome it if you could push your c++ wrapper into the main Julia
source code!
Cheers,
Tobi
Am Montag, 10. Februar 2014 17:35:38 UTC+1 schrieb Carlos Becker:
>
> Hi Tobias,
>
> model = SQBMatrixTrain( featureMatrix, labelVector, maxIters, options )
>
> That is how the matlab call looks like, so it is very transparent.
> That is how I want the Julia call look like, and I think that it is better
> to pass Julia objects directly to ccall() in those cases.
>
> It also offers more freedom for C/C++ programmers. I have some code
> already working, and to me it looks neater than
> creating new function calls to pass/return array sizes/etc, and added to
> that my fear to mis-matched structs between C and Julia.
>
> For example, with what I have now working in C++, to create a struct of
> type MyStruct from a module,
> with members *str2, str1 *and *num*, one does:
>
> extern "C" {
> void * createStructTest( void *module )
> {
> JL::Struct::Type s = JL::Struct::create( module, "MyStruct" );
> JL::Struct::setField( s, "str2", "This is str2" );
> JL::Struct::setField( s, "num", (int64_t)1234 );
> JL::Struct::setField( s, "str2", "another string" );
>
> return s;
> }
> }
>
> and it automatically checks that MyStruct is a valid type, that str2 is a
> member and it is a string,
> that num is a member and is a int64, etc. If not, it throws a Julia
> exception and ends cleanly.
>
> As I said before, I think this could help Julia newcomers when wrapping
> their C/C++ libraries.
>
> Thanks.
>
>
> ------------------------------------------
> Carlos
>
>
> On Mon, Feb 10, 2014 at 5:20 PM, Tobias Knopp
> <[email protected]<javascript:>
> > wrote:
>
>>
>> Am Montag, 10. Februar 2014 14:17:02 UTC+1 schrieb Carlos Becker:
>>
>>>
>>> model = SQBMatrixTrain( featureMatrix, labelVector, maxIters, options )
>>>
>>
>> Is this the function declaration of the C function or is this how you
>> want your Julia API to look like?
>> If its the C signature and model is a pointer to an array of structs,
>> this function cannot be used at all as the user cannot know the length of
>> model.
>> Note, by the way that the length/size of an array is not a compile time
>> parameter. It can be changed during runtime.
>>
>>
>>
>
