mgrabovsky

// http://stackoverflow.com/a/2553109/227159

/**
 * In its constructor temp_value stores a reference to a variable and a copy of the
 * variable's original value. In its destructor it restores the referenced variable
 * to its original value. So, no matter what you did to the variable between
 * construction and destruction, it will be reset when the temp_value object goes out
 * of scope.
 */