Benjamin-Philip
I’m having some trouble just returning ok from rust. The following fails with an Erlang error: :invalid_struct:
mod atoms {
rustler::atoms! {
ok
}
}
#[rustler::nif]
pub fn backend_deallocate(array: ExAf) -> Atom {
let exaf_array = array.resource.value();
match exaf_array {
ExAfArray::U8(a) => drop(a),
ExAfArray::U16(a) => drop(a),
ExAfArray::U32(a) => drop(a),
ExAfArray::U64(a) => drop(a),
ExAfArray::S16(a) => drop(a),
ExAfArray::S32(a) => drop(a),
ExAfArray::S64(a) => drop(a),
ExAfArray::F16(a) => drop(a),
ExAfArray::F32(a) => drop(a),
ExAfArray::F64(a) => drop(a),
ExAfArray::C64(a) => drop(a),
ExAfArray::C128(a) => drop(a),
}
atoms::ok()
}
How can I return :ok (or any other atom) from Rust?
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mindok
I don’t really understand what I’m doing with Rustler, but this recipe seems to work (for me):
Benjamin-Philip
Thanks for your reply @mindok!
It turns out the reason I was getting an
Erlang Error: :invalid_structerror was because I was passing in an “invalid struct” (i.e. an incorrect input for my NIF) and not because of any issues with the rustler output.Here’s what (in essence) worked for me:
SeokminHong
You can use
rustler::types::atommodule to use predefined atoms:nil,ok,error,true, and so on.