What's wrong with $object->get_error
? This way you can have object-specific errors.
Obviously (as I confirmed in a CB session with tye,theorbtwo and others) I cannot return error strings that are logically false, but I'd like to preserve the illusion.
That's not entirely true. You can use overload to create an object that will return a string when stringified and false when boolified. And, frankly, that's what I'd do if you're not going to allow exceptions or globals, but still require an error string.
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