When and why is longjmp used in C++?
<p>I have read the following tutorial, but I don't understand it well. When is longjmp used and why it is necessary to know?</p>

<p><a href="http://www.cplusplus.com/reference/clibrary/csetjmp/longjmp/" rel="nofollow">http://www.cplusplus.com/reference/clibrary/csetjmp/longjmp/</a></p>
