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If payroll()'s parameter pe refers to an object of type manager, the virtual member function bonus() defined in the base class employee is called because the manager class does not override the virtual function bonus() defined in class employee If payroll()'s parameter pe refers to an object of type programmer, the virtual member function bonus() defined in the class programmer is called When adding virtual functions to a class hierarchy, it becomes necessary to recompile all of the class member functions in the class hierarchy We can add the virtual member function bonus() if we have access to the source code implementing the member functions of the classes employee, manager, and programmer This is not always the case If the previous class hierachy is provided by a third-party library vendor, the vendor may have provided only the headers defining the interface of the classes in the library and the object files for the library The source code for the class member functions may not be available In this case, recompiling the member functions for the classes in the hierarchy is not possible If we wish to extend the class library, we cannot add virtual member functions We may still want to add the functionality, in which case the use of the dynamic_cast becomes necessary The dynamic_cast operator is used to obtain a pointer to a derived class to use some detail of the derived class that is not otherwise available For example, let's assume that we extend the library by adding the additional member function bonus() to the class programmer We can add the declaration of this member function to the definition of the class programmer available in the

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The bottom-up approach is best applied to systems where some of the lower level functions may be well understood and documented and represented by a number of submodules. However, the process of integrating these modules into a higher subset presents dif culties as the interaction between the individual subsystems is not fully understood. In this case building up the top level requirements from the bottom may well enable the requirements to be fully captured. An example of this type might be the integration of aircraft systems into an integrated utilities management system. In this case the individual requirements of the fuel system, hydraulic system, environmental control system etc. may be well understood. However, the inter-relationships between the candidate systems and the implications of adopting integration may better understood and documented by working bottom up. In fact most development projects may use a combination of both of these approaches to best capture the requirements.

header file, and define this new member function in one of our own program text files:

class employee { public: virtual int salary(); }; class manager : public employee { public: int salary(); }; class programmer : public employee { public: int salary(); int bonus(); };

Remember that our function payroll() receives a parameter that is a pointer to the base class employee We can use the dynamic_cast operator to obtain a pointer to the derived class programmer and use this pointer to call the member function bonus(), as follows:

void company::payroll( employee *pe ) { programmer *pm = dynamic_cast< programmer* >( pe ); // if pe refers to an object of type programmer, // the dynamic_cast is successful, // and pm refers to the start of the programmer object if ( pm ) { // use pm to call programmer::bonus() } // if pe does not refer to an object of type programmer, // the dynamic_cast fails, // and pm has the value 0 else { // use of employee's member functions } }

Prices take off! (Source: FutureSource. Reprinted with permission.)

dynamic_cast< programmer* >( pe )

converts its operand pe to the type programmer* The cast is successful if pe refers to an object of type programmer, otherwise, the cast fails and the result of the dynamic_cast is the value 0 The dynamic_cast operator therefore performs two operations at once It verifies that the requested cast is indeed valid, and then only if it is valid does it perform the cast The verification takes place at run-time The dynamic_cast is safer than the other C++ cast operations because the other casts do not verify whether the cast can actually be performed

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