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The answer to the question of whether constructors and destructors should be virtual or not virtual is that constructors are never virtual and that destructors should always be made virtual if they are being used in a base class and should be nonvirtual otherwise The reasoning is as follows For constructors a v i r t u a l label is meaningless We can always determine at compile time what we are constructing As a result, declaring a constructor virtual is forbidden by the Standard Destructors need to be v i r t u a l to ensure that the destructor for the actual object is called Otherwise if the derived class consists of some additional members that have dynamically allocated memory, that memory will not be freed by the base class destructor In a sense the destructor is no different from any other member function For example, in Figure 410, suppose that the base class contains s t r i n g s name1 and name2 Automatically, its destructor calls the destructors for these strings, so we are tempted to accept the default In the derived class we have an additional s t r i n g , newName Its destructor automatically calls new~ame's destructor and then the base class destructor So everything appears to work However, if the destructor for the base class is used for an object of the derived class, only those items that are inherited are destroyed The destructor for the additional data member newName cannot possibly be called because existence the destructor for the base class is oblivious to new~ame's Thus, even if the default destructor seems to work, it actually does not work if there is inheritance In an inheritance hierarchy, then, the base class constructor should always be virtual Even if it is a trivial destructor, it should be written anyway, with a virtual declaration and empty body When the destructor is virtual, we are certain that a run-time decision will be used to choose the destructor appropriate to the object being deleted Figure 41 1 shows the class interface for e x c e p t i o n Note how the destructor is virtual. native barcode generator for crystal reports free download How to Create Code 39 Barcodes in Crystal Reports - YouTube Aug 9, 2011 · This tutorial explains how to create Code 39 (Code 3 of 9) barcodes in Crystal Reports ...Duration: 3:19Posted: Aug 9, 2011 crystal report barcode generator Tips for Printing to Zebra printers from Crystal Reports 10 Mar 2017 ... 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