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As we proceed well find frequent outcrops of the rock that supports our mountains, which is named after the area in which it is found and is called the no-throw exception safety guarantee - as the name suggests this implies that the corresponding function will never propagate an exception.
Clearly operations on the base types provide this guarantee, as will any sequence of no-throw operations. If it were not for the firm footing that these outcrops of the no-throw exception safety guarantee provide we would have great difficulty ascending the heights.
Although the no-throw exception safety guarantee was known and used in earlier work I think it was first made explicit and named by Herb Sutter (Exceptional C++ - ISBN 0-201-61562-2).
We've now seen our landmarks, please take a moment to be sure you understand them they are fundamental to what follows.