func someFunc() (err error) {
defer func(err_ error) {
r.handleErrOrPanic(err_, obj)
}(err) // err is always nil here
err = ThrowErrOrPanic(ctx, obj)
return err
}
I would like to use handleErrOrPanic as a deferred function to handle the error or the panic. I have to define it before ThrowErrOrPanic, since the deferred function has to handle the panic. However, if I define it before err is always nil. How do I solve this?
In the deferred func use the named return value of the surrounding function, i.e. use err not err_. If you got panic and you want to recover from it use recover() in the deferred func.
func someFunc() (err error) {
defer func() {
if x := recover(); x != nil { // panic occurred?
// handle panic
} else if err != nil { // a plain error occurred?
// handle error
} else {
// all good
}
}()
err = ThrowErrOrPanic(ctx, obj)
return err
}