When an exception is caught by a function-try-block handler in a constructor, any fully constructed base classes and class members of the object are destroyed prior to entering the handler [ISO/IEC 14882-2014]. Similarly, when an exception is caught by a function-try-block handler in a destructor, all base classes and nonvariant class members of the objects are destroyed prior to entering the handler. Because of this behavior, the C++ Standard, [except.handle], paragraph 10, states the following:
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