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Exception safety
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<p>Exception safety is the state of code working correctly when exceptions are thrown. To aid in ensuring exception safety, <a href="/facts/C%2B%2B/Et0F2qn9">C++</a> standard library developers have devised a set of <i>exception safety levels</i>, contractual guarantees of the behavior of a data structure's operations with regards to exceptions. Library implementers and clients can use these guarantees when reasoning about <a href="/facts/Exception_handling_(programming)/XM8EsBpg">exception handling</a> correctness. The exception safety levels apply equally to other languages and error-handling mechanisms. </p>