54 lines
1.5 KiB
C
54 lines
1.5 KiB
C
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//
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// Class definitions provided by a library vendor.
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//
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#include <string>
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class employee {
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std::string Name;
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protected:
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int hourRate;
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public:
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employee( const char *n, int hr );
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virtual ~employee();
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std::string name() { return( Name ); }
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virtual int salary() = 0;
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};
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class manager : public employee {
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int Experience;
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public:
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manager( const char *n, int hr, int ex ) :
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employee( n, hr ), Experience( ex ) {}
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int salary();
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};
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//
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// The following is a 'programmer' class defined by the user and based on
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// the 'employee' class. Data members Overtime and OvertimeRate, and the
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// member functions setOvertimeRate, addOvertime, resetOvertime and
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// overtimePay were added.
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//
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// In a situation where library vendor didn't provide the source code for
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// impl.cpp, users cannot recompile that module and hence cannot add any
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// virtual member functions to the 'employee' base class. This means that
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// in a heterogeneous collection of employees one needs to first check if
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// an employee is a programmer before attempting to invoke one of the
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// additional member functions.
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//
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class programmer : public employee {
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int OvertimeRate;
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int Overtime;
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public:
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programmer( const char *n, int hr ) : employee( n, hr ) {}
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void setOvertimeRate( int otr ) { Overtime = 0; OvertimeRate = otr; }
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void addOvertime( int ov ) { Overtime += ov; }
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void resetOvertime() { Overtime = 0; }
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int overtimePay() { return( Overtime * OvertimeRate ); }
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int salary() ;
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};
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