Hi i'm porting a C++ API with a class member function
class System
{
...
setUserData(void *userdata);
getUserData(void **userdata);
void *mUserData; // typically in C the value is stored here
}
and in javascript i'd like to be able to pass any type of object so that I
can store it in the class (either in my void * pointer or any other type of
pointer).
ie
var test = "hello";
var test_out = {};
gSystem.setUserData(test); // test = "hello"
gSystem.getUserData(test_out); // test_out.val = "hello"
but also var test could be a number, or struct, or any other type of object.
Above, the getUserData is setting a member of the JS object called "val" ,
via set("val", value); We use this pattern with other standard types of
functions (that take strings/numbers/etc) and it works well.
The issue i'm having is trying to bind my setUserData function to take a
/generic/ object so I can store it, then just set it as the "val" for the
getUserData function.
I've
found
https://github.com/kripken/emscripten/blob/master/tests/embind/embind_test.cpp
useful for trying all different types of binding, but I don't want to
create a new object in the C++ side to store the object. I had a working
version that created an emscripten::val of type object() on the C++ side,
and stored it, and returned that object in the getUserData side, but I dont
want to create any intermediate objects , I just want to store whatever
comes in and pass the same thing back.
I've tried all sorts of things including messing with allow_raw_pointers,
creating a val_holder (which creates a temporary store) and treating the
parameter as if it was a smart pointer or void * (it gives an error param
type pV not supported), but i'm just stabbing in the dark at the moment.
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