Function uniffi::ffi::rust_call

pub fn rust_call<F, R>(out_status: &mut RustCallStatus, callback: F) -> Rwhere
    F: UnwindSafe + FnOnce() -> Result<R, RustBuffer>,
    R: FfiDefault,

Handle a scaffolding calls

callback is responsible for making the actual Rust call and returning a special result type:

• For successful calls, return Ok(value)
• For errors that should be translated into thrown exceptions in the foreign code, serialize the error into a RustBuffer, then return Ok(buf)
• The success type, must implement FfiDefault.
• Return::lower_return returns Result<> types that meet the above criteria>
• If the function returns a Ok value it will be unwrapped and returned
• If the function returns a Err value:
  • out_status.code will be set to RustCallStatusCode::Error.
  • out_status.error_buf will be set to a newly allocated RustBuffer containing the error. The calling code is responsible for freeing the RustBuffer
  • FfiDefault::ffi_default() is returned, although foreign code should ignore this value
• If the function panics:
  • out_status.code will be set to CALL_PANIC
  • out_status.error_buf will be set to a newly allocated RustBuffer containing a serialized error message. The calling code is responsible for freeing the RustBuffer
  • FfiDefault::ffi_default() is returned, although foreign code should ignore this value