On Mon, Aug 3, 2015 at 6:07 PM, Jonas Sicking <[email protected]> wrote:
How would you make a factory function like the above fail? Returning
> an nsresult will make it not much better than NS_NewFoo() pattern.
> Returning null won't let you indicate a useful error code (though
> maybe there's no such thing as useful error codes and we should just
> report errors to the console).
>
> The only other alternative is to use the nsresult out argument, which
> I agree is not easy on the eyes.
Or return a Variant.
static Variant<nsRefPtr<Foo>, ErrorType> Foo::Make();
...
auto /* lol */ fooOrError = Foo::Make();
if (fooOrError.is<ErrorType>()) {
// Handle error...
return;
}
auto foo = fooOrError.extract<nsRefPtr<Foo>>();
- Seth
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