It sounds like embind currently does not support forward-declared classes
because some information about the type definition is necessary at bind
type: how to copy the value, destroy it, and so on.
It's probably possible to add support for this functionality. I wonder if
there is a way using C++ templates to determine whether a type is declared
or declared-and-defined at bind time.
If not, perhaps an API something like...
opaque_handle<C>("C");
... would work. You wouldn't be able to bind member functions or
constructors or destructors or anything, but you could pass C* pointers
around as opaque integers.
On Wed, Nov 19, 2014 at 8:46 AM, <[email protected]> wrote:
> OK, it's not the virtual function. It's because this class is referenced
> in an other file just with "class GuidoParser;" and not with the include
> file definition.
>
>
> Le mercredi 19 novembre 2014 17:02:44 UTC+1, [email protected] a
> écrit :
>
>> Thanks, I try it and it work for my simple example.
>>
>> But in my project, the class has virtual methods (but no pure virtual)...
>> and I have now this error :
>> incomplete type 'GuidoParser' used in type trait expression
>> : public integral_constant<bool, __is_polymorphic(_Tp)> {};
>>
>> Any idea ?
>>
>> Le mercredi 19 novembre 2014 16:13:00 UTC+1, jj a écrit :
>>>
>>> You can register that class without anything exposed on it, which will
>>> allow you to pass pointers to it around in a black-box manner.
>>>
>>> 2014-11-19 17:07 GMT+02:00 <[email protected]>:
>>>
>>>> Hi,
>>>>
>>>> I try to pass object pointer argument to method of an embind class. The
>>>> objet pointer argument is not a embind class.
>>>> Here a example of code :
>>>>
>>>> #include <emscripten.h>
>>>> #include <bind.h>
>>>>
>>>> using namespace emscripten;
>>>>
>>>>
>>>> class A {
>>>> public:
>>>> A () {
>>>> a=5;
>>>> }
>>>> void add() {
>>>> a = a+1;
>>>> }
>>>> int get() {
>>>> return a;
>>>> }
>>>> private:
>>>> int a;
>>>> };
>>>>
>>>> class B {
>>>> public:
>>>> B () {
>>>> b=10;
>>>> }
>>>> void add() {
>>>> b = b+1;
>>>> }
>>>> int get() {
>>>> return b;
>>>> }
>>>>
>>>> A* getA() {
>>>> return new A;
>>>> }
>>>>
>>>> void addA(A* a) {
>>>> b+=a->get();
>>>> }
>>>> private:
>>>> int b;
>>>> };
>>>>
>>>>
>>>> EMSCRIPTEN_BINDINGS(test) {
>>>> class_<B>("B")
>>>> .constructor<>()
>>>> .function("add",&B::add)
>>>> .function("get",&B::get)
>>>> .function("getA",&B::getA, allow_raw_pointers())
>>>> .function("addA",&B::addA, allow_raw_pointers())
>>>> ;
>>>> }
>>>>
>>>> My javascript code :
>>>>
>>>> var B = new Module.B;
>>>> var A = B.getA();
>>>> B.addA(A);
>>>>
>>>> I get the following error : "ReferenceError: getTypeName is not defined"
>>>> I suppose it's because the class A is not embind. I work with big class
>>>> I don't have to manipulate in javascript, I just have a pointer.
>>>>
>>>> Is it possible to use pointer on class which are not embind ? (like
>>>> cwrap which return an integer for a pointer)
>>>>
>>>> --
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>>>>
>>>
>>> --
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--
Chad Austin
Technical Director, IMVU
http://engineering.imvu.com <http://www.imvu.com/members/Chad/>
http://chadaustin.me
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