探讨了在编程中如何确保函数即使在异常抛出时也不泄露资源或导致数据结构损坏，提出了基本、强和不抛异常的保证概念。通过copy-and-swap实现强保证，但并非所有函数都适用。
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Exception-safe functions leak no resources and allow no data structures to become corrupted, even when exceptions are thrown. Such functions offer the basic, strong, or nothrow guarantees.
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The strong guarantee can often be implemented via copy-and-swap, but the strong guarantee is not practical for all functions.
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A function can usually offer a guarantee no stronger than the weakest guarantee of the functions it calls.
转载于:https://www.cnblogs.com/zhtf2014/archive/2011/03/30/2000408.html
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