Library Idea
state_saver

by Robert Ramey

Sometimes a certain value has to change only for a limited scope. This class wrapper saves a copy of the current state of some object, and resets the object’s state at destruction time, undoing any change the object may have gone through. Here’s and example:

#include <boost/state_saver.hpp>

void func(A & a)
    boost::state_saver<A> s(a);
    ... // alter state of a by calling non-const functions
    ... // call other functions
    // original state of a automatically restored on exit
}

The boost serialization library currently includes such a component but has it never been formally accepted, it’s currently an implementation detail of the boost serialization library.
http://www.boost.org/doc/libs/1_57_0/libs/serialization/doc/state_saver.html

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