I have embind code that does the following to return something from native to JS.
val ret = val::object();
if (status) {
ret.set("transcodedImage", dst);
}
return ret;
where dst is
TranscodedImage* dst
Since 4.0.9 I get (I've removed the backtrace from my code to the assertion
statement)
/emsdk/upstream/emscripten/cache/sysroot/include/emscripten/wire.h:124:19:
error: static assertion failed due to requirement
'!std::is_pointer<msc::TranscodedImage *>::value': Implicitly binding raw
pointers is illegal. Specify allow_raw_pointer<arg<?>>
124 | static_assert(!std::is_pointer<T*>::value, "Implicitly binding raw
pointers is illegal. Specify allow_raw_pointer<arg<?>>");
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~
...
/src/interface/js_binding/transcoder_wrapper.cpp:277:21: note: in instantiation
of function template specialization 'emscripten::val::set<char[16],
msc::TranscodedImage *>' requested here
277 | ret.set("transcodedImage", dst);
| ^
I cannot figure out how to specify `allow_raw_pointer`. I added `,
allow_raw_pointers()` to the end of the function declaration in the
EMSCRIPTEN_BINDINGS section but I got the same error. I have tried to use
`allow_raw_pointer` template with TranscodedImage* as the arg in various ways
but I am clearly not doing it the right way. I get a log of different errors.
For example
What is the right way?
The documentation did not help.
https://emscripten.org/docs/api_reference/bind.h.html#how-to-use-this-api just
says "type allow_raw_pointer” under a heading of “Policies.”
https://emscripten.org/docs/porting/connecting_cpp_and_javascript/embind.html#embind
does not even mention `allow_raw_pointer`.
For reference the declaration of TranscodeImage is
class TranscodedImage {
public:
TranscodedImage(size_t size) : image(size) { }
uint8_t* data() { return image.data(); }
size_t size() { return image.size(); }
val get_typed_memory_view() {
return val(typed_memory_view(image.size(), image.data()));
}
protected:
std::vector<uint8_t> image;
};
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