Hi,
I've got a nasty compressed list structure in C++ and would like to iterate
through it from JavaScript using a for-each style method, passing a
JavaScript function as a callback. My C++ test code is:
#include <emscripten.h>
#include <emscripten/bind.h>
class Iterable {
public:
void each(void(*fn)(int)) const {
fn(42);
}
};
EMSCRIPTEN_BINDINGS(test) {
emscripten::class_<Iterable>("Iterable")
.constructor<>()
.function("each",&Iterable::each,emscripten::allow_raw_pointers());
}
Called from JavaScript like:
i=new Module.Iterable();
i.each(function(x) {console.log(x);})
However it gives an error:
UnboundTypeError: Cannot call Iterable.each due to unbound types: PFviE
I understand that the callback function needs wrapping using
Runtime.addFunction and embind doesn't handle things automatically in this
case for example because lifetime of the pointer is unclear, but what would
be the simplest way to make this work, preferably so that if some C++
function returns an Iterable to JavaScript, its prototype would already
have an each() method with all the required wrappers?
Best regards,
-Juha
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