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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 } }

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

Similar to the maintenance of CIT, when node i detects that the link to node k has failed, node i removes from CRTi all the entries whose requester elds are equal to k If CRTi contains an entry c, k but node i hears a CoreRequest table from node k without an entry c, i , the entry c, k is removed from CRTi Node i determines if it is currently on the backbone by checking if it is either a core (parenti = i) or an intermediate node (|CRTi | > 0) These nodes on the backbone play an important role for facilitating multicast operations, which will be described in the next section 62.

file:///F|/WinDDK/resources/CPPPrimer/c++primerhtm (924 / 1065) [2001-3-29 11:32:14]

A basic multiplier deduced from Algorithm 16.5 is shown in Figure 16.6. The rounding circuit is the same as in the case of the adder-subtractor (Figure 16.4).

In the previous example, if at run-time pe actually points to a programmer object, the dynamic_cast operation is successful and pm is initialized to point to a programmer object Otherwise, the result of the dynamic_cast operation is 0 and pm is initialized with the value 0 By checking the value of pm, the function company::payroll() knows when pe refers to a programmer object It can then use the member function programmer::bonus() to calculate a programmer's salary If the dynamic_cast fails because pe refers to a manager object, the more general pay calculation that does not use the new member function programmer::bonus() is used instead The dynamic_cast is used for safe casting from a pointer to a base class to a pointer to a derived class, often referred to as safe downcasting It is used when one must use the features of the derived class that are not present in the base class Manipulating objects of derived class type with pointers to base class type is usually handled automatically through virtual functions In some situations however, the use of virtual functions is not possible The dynamic_cast offers an alternate mechanism for such situations, although this mechanism is more error prone than virtual member functions and should be used with caution One possible error is using the result of the dynamic_cast before appropriately testing that its result has the value 0 If it does, then this result cannot be used as if it refers to a class object For example:

void company::payroll( employee *pe ) { programmer *pm = dynamic_cast< programmer* >( pe ); // potential error: uses pm before testing its value static int variablePay = 0; variablePay += pm->bonus(); // }

The result of the dynamic_cast operator must always be tested to verify that the cast is sucessful before using the resulting pointer A better definition for the company::payroll() function is as follows: