On Fri, May 20, 2011 at 3:34 AM, Laurie Harper <[email protected]> wrote:
> Assertion failed: (handle->InternalFieldCount() > 0), function Wrap, file > /Users/laurie/.nvm/v0.4.5/include/node/node_object_wrap.h, line 61. > When you subclass a native class from JS then the native 'this' pointer (which is stored in an internal field) cannot, without extra tooling to make it work, be found. The problem is that the JS 'this' is a subclass with no internal field count. This can be worked around on the C++ side, so that such lookups will (with a bit of extra effort) be able to find their proper native "this" object. i have an example which does this type of lookup here: http://code.google.com/p/v8-juice/source/browse/convert/include/v8/convert/ClassCreator.hpp#330 in the function FindHolder(). That function is used internally by my API to do the "this" lookup when a C++/JS-bound class is subclassed from JS. Because this requires a significant performance overhead for the lookup, it is a compile-time (template-defined) option (in my lib, anyway - feel free to implement yours how you like). -- ----- stephan beal http://wanderinghorse.net/home/stephan/ -- v8-users mailing list [email protected] http://groups.google.com/group/v8-users
