3 ms·

I've never seen or used reflection with error handling in Go, what do you mean?

• sidlls 3y ago
  https://cs.opensource.google/go/go/+/refs/tags/go1.21.6:src/errors/wrap.go;l=17 https://cs.opensource.google/go/go/+/refs/tags/go1.21.6:src/...
  • Thaxll 3y ago
    But this is a detail of implementation, user code does not use reflection with errors.
    • sidlls 3y ago
      That "detail of implementation" is what is used by user code, e.g., `myError.As(...)` uses reflection, implicitly.
      • Thaxll 3y ago
        Then what? It has 0 performance impact, we're talking about error handling here, it's rare and not in hot path.
        • sidlls 3y ago
          It does not have 0 performance impact, it's not rare, and in applications that are in the hot path, error handling is also in the hot path.
          • Thaxll 3y ago
            No, it only executes when you enter the err != nil block so it's almost never called, again 0 impact on performance.
  • derekperkins 3y ago
    I wouldn't classify type assertion as reflection. It's a super fast type check of the object header, not dynamic reflection.