Fehlerbehandlung in Rust

#[cxx::bridge] mod ffi { extern "Rust" { fn fallible(depth: usize) -> Result<String>; } } fn fallible(depth: usize) -> anyhow::Result<String> { if depth == 0 { return Err(anyhow::Error::msg("fallible1 requires depth > 0")); } Ok("Success!".into()) }

Speaker Notes

  • Rust functions that return Result are translated to exceptions on the C++ side.
  • The exception thrown will always be of type rust::Error, which primarily exposes a way to get the error message string. The error message will come from the error type's Display impl.
  • A panic unwinding from Rust to C++ will always cause the process to immediately terminate.