Well I still could not get it work exactly like this. I got that
conversion from val to work with smart ptrs but not with raw ptrs.
Anyways, I got a workaround that is working well enough, and will stick
with that for now.
Thanks for the help.
On 12/09/2015 10:41 PM, Brion Vibber wrote:
I believe you can avoid the extra factory interface class I mentioned
by passing a function that returns the constructed object as an
emscripten::val. You can call that, and embind should marshal the
object correctly.
So, on the JS side something like:
Module.doSomeStuff(function(f) {
return new MyDerivedClass(f);
});
on the C++ side something like:
void doSomeStuff(emscripten::val factoryFunc) {
TestStruct *s = factoryFunc(2.2);
}
-- brion
On Wed, Dec 9, 2015 at 1:30 PM, Brion Vibber <[email protected]
<mailto:[email protected]>> wrote:
Ah, I see -- the JS object that's created isn't actually a pointer
in this case, it's a wrapper object (that contains a pointer).
Digging into the wrapper object to find the pointer is probably
gauche...
Easiest way may be to define a virtual factory class in C++, which
has a method that is bound to return your instance type; then you
can pass the derived JS factory instance into your C++ side and
simply call that function instead of the constructor directly.
-- brion
On Wed, Dec 9, 2015 at 12:56 PM, Joshua Auerbach
<[email protected] <mailto:[email protected]>> wrote:
Are you sure it's so simple?
Calling this from C++ does not work properly:
TestStruct* testPtr = reinterpret_cast<TestStruct*>(
emscripten_run_script_int("new Module.TestStruct(2.2);") );
while I can create TestStructs with the same constructor fine
from within JavaScript (and emscripten_run_script_int works if
I am actually returning an int)
note:
struct TestStruct {
double a;
TestStruct(double x) : a(x) {}
};
EMSCRIPTEN_BINDINGS(my_module) {
emscripten::class_<TestStruct>("TestStruct")
.constructor<float>()
.property("a", &TestStruct::a);
}
Thanks,
Josh
On 12/09/2015 06:54 PM, Brion Vibber wrote:
Simply return the pointer from the function with the 'return'
statement, like any other function return value. Remember
that pointers are just integers.
-- brion
On Dec 9, 2015 6:13 AM, "Josh A" <[email protected]
<mailto:[email protected]>> wrote:
Hi all,
This seems like it should be really straight forward, but
I can't find an example of this.
I am trying to expose some scripting on my software:
With embind I expose an Interface that should be
implemented by javascript. This works fine.
Now I want to call some code that takes a provided js
implementation of the interface, instatiates it and
returns a pointer to C++ of the created object. I can do
the js call fine and everything works, but I can't seem
to find how to get the pointer from the js back to the
C++, either using an emscripten_run_script variant or
using embind vars or some other method.
I have tried searching, reading through docs and looking
at the test code, but still can't find an example of
this. Can someone please point me to the right place?
Thanks++
Josh
--
You received this message because you are subscribed to
the Google Groups "emscripten-discuss" group.
To unsubscribe from this group and stop receiving emails
from it, send an email to
[email protected]
<mailto:[email protected]>.
For more options, visit https://groups.google.com/d/optout.
--
You received this message because you are subscribed to the
Google Groups "emscripten-discuss" group.
To unsubscribe from this group and stop receiving emails from
it, send an email to
[email protected]
<mailto:[email protected]>.
For more options, visit https://groups.google.com/d/optout.
--
Dr. Joshua E. Auerbach
Postdoctoral Researcher
Laboratory of Intelligent Systems
École Polytechnique Fédérale de Lausanne
--
You received this message because you are subscribed to the
Google Groups "emscripten-discuss" group.
To unsubscribe from this group and stop receiving emails from
it, send an email to
[email protected]
<mailto:[email protected]>.
For more options, visit https://groups.google.com/d/optout.
--
You received this message because you are subscribed to the Google
Groups "emscripten-discuss" group.
To unsubscribe from this group and stop receiving emails from it, send
an email to [email protected]
<mailto:[email protected]>.
For more options, visit https://groups.google.com/d/optout.
--
Dr. Joshua E. Auerbach
Postdoctoral Researcher
Laboratory of Intelligent Systems
École Polytechnique Fédérale de Lausanne
--
You received this message because you are subscribed to the Google Groups
"emscripten-discuss" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
For more options, visit https://groups.google.com/d/optout.
