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It is also reasonably certain that youthful qualities can be generated by such an approach , but what remains very unclear is whether this would have any noticeable impact on life expectancy . If any virtual member functions are present , however , the C++ class may not serve as a type of an Objective-C ivar . C++ class in question ( along with all of its superclasses ) does not have any virtual member functions defined . A string of clean , installed , upgrade , downgrade , or mixed based on how the versions of packages attached to the <choice> compare to the versions of any same packages already installed . Any protracted delays are likely to exacerbate these problems and could eventually result in the collapse of the Agreed Framework if IAEA cannot verify , with sufficient assurance , North Korea 's nuclear declaration . They seem to doubt the effectiveness of any covert operations against the Middle East 's most accomplished survivalist .