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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <html> <head> <title>Exception Guarantee Specifics</title> </head> <body bgcolor = "white"> <h1>Exception Guarantee Specifics</h1> The following represent exception guaratee specifics, subject to the <a href="component_requirements.html#exception_requirements">component exception-requirements</a>. <ol> <li> <a name="basic_guarantee">No</a> resources are leaked in the face of exceptions. In particular, this means: <ol> <li>By the time a container's destructor completes: <ol> <li>It has returned all memory it has allocated to the appropriate deallocation function.</li> <li>The destructor has been called for all objects constructed by the container.</li> </ol> <li>Algorithms destroy all temporary objects and deallocate all temporary memory even if the algorithm does not complete due to an exception.</li> <li>Algorithms which construct objects either complete successfully or destroy any objects they have constructed at the time of the exception.</li> <li>Algorithms which destruct objects always succeed.</li> <li>Containers continue to fulfill all of their requirements, even after an exception occurs during a mutating function. For example, they will never give an inaccurate report of its size, or fail to meet performance requirements because of some thrown exception.</li> </ol> </li> <li> <a name="strong_guarantee">The</a> <i>strong guarantee</i>: If an operation on a container fails due to an exception, then, semantically, the operation is a no-op applied to the container.</li> <li> <a name="cannot_throw_guarantee">The</a> operation cannot throw an exception.</li> </ol> (The phrasing of the above is based on <a href="references.html#abrahams97exception">[abrahams97exception]</a>.) </body> </html>