In javascript it's doable by doing this:
function MyType()
{}
var obj;
obj.__proto__ = MyType.prototype;
(obj instanceof MyType) will return true;
However, trying to do this in C++, by doing
obj->SetPrototype(MyTypeFunc->GetPrototype())
does not work, and I can see that MyTypeFunc->GetPrototype() returns a
function, printed as:
Empty{}
Now the question is - how do I get the 'prototype' property of the
constructor? Maybe I should just get it as an ordinary property? Any ideas?
12 март 2012, понеделник 18:19:02 UTC+2, avasilev написа:
>
> Yes, it works for me also, but the problem is that this also calls the
> constructor invocation callback, which I want to avoid in this case.
>
>
> 12 март 2012, понеделник 17:55:17 UTC+2, Stephan Beal написа:
>>
>> On Mon, Mar 12, 2012 at 4:39 PM, avasilev <[email protected]> wrote:
>>
>>> Basically I would like to be able to have instanceof working on objects
>>> that implement native bindings. If I create the object in C++ via
>>> Function::NewInstance(), then this works as expected. However, I want to be
>>> able to create an object both via the js constructor, and in C++ code
>>> without the C++ code calling the js constructor (which happend if I use
>>> Function::NewInstance()).
>>
>>
>> If you want v8 to know about the object, the native ctor must tell it. Or
>> you can...
>>
>>
>>> Is it possible to do that? I tried to instantiate the object from the
>>> constructor's prototype template, via
>>> ctorFunc->PrototypeTemplate()->NewIsntance(), but this does not do the job
>>> and instanceof does not recognize the object as created by this
>>> constructor. Any ideas?
>>>
>>
>> NewInstance() works for me. Here's an example of how i'm using it:
>>
>>
>> http://code.google.com/p/v8-juice/source/browse/convert/include/cvv8/ClassCreator.hpp?r=2173#894
>>
>> The CastFromJS() call there essentially needs to be replaced with your
>> extract-native-from-JS-Object routine.
>>
>> If you want to be able to destroy such object from C++ code (don't use
>> delete - it will leave the v8 bits pointing at dead objects), there's an
>> example of that here:
>>
>>
>> http://code.google.com/p/v8-juice/source/browse/convert/include/cvv8/ClassCreator.hpp?r=2173#971
>>
>> i hope that helps.
>>
>> --
>> ----- stephan beal
>> http://wanderinghorse.net/home/stephan/
>> http://gplus.to/sgbeal
>>
>>
--
v8-users mailing list
[email protected]
http://groups.google.com/group/v8-users
