Quote: the author of a library can detect run-time errors but does not know what to do about them; use throw and catch

Quotation Skeleton

The author of a library can detect run-time … The notion of an exception is provided to … that it cannot cope with throws an exception, … handle that kind of problem can indicate that … [p. 296] [Throw/catch] provides a way of explicitly separating … [It] provides a more regular style of error … [than error values or error call-backs] …   Google-1   Google-2

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Quote: throw and catch separates error handling code from ordinary code; error handling is more regular than with error values or error call-backs

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