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Comparing RAII with the <code>finally</code> construct used in Java, Stroustrup wrote that “In realistic systems, there are far more resource acquisitions than kinds of resources, so the 'resource acquisition is initialization' technique leads to less code than use of a 'finally' construct.”<ref name="faq"/>
As a class invariant, RAII provides guarantees that an object instance that is supposed to have acquired a resource has in fact done so. This eliminates the need for additional "setup" methods to get a newly-created object into a usable state (all such work is performed in the constructor; similarly, "shutdown" tasks to release resources occur in the object's destructor), and the need to test instances to verify that they have been properly set up before every use.<ref>[https://en.cppreference.com/w/cpp/language/raii.html RAII at cppreference.com]</ref>
==Typical uses==
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