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I always thought they were risky, but now I want to learn for myself, he replied Futures trading is risky, I agreed, but what gave you the impression not to open a futures account before My stock broker told me not to trade commodities, that I would lose my shirt, he said So I kept buying the stocks he recommended, and, instead, I lost my shirt with him..

the two invocations through pointer and reference are resolved to their dynamic type In this example, they both invoke NameQuery::print() The invocation through object always invokes Query::print() (We'll see a program code example of the effect of slicing in Section 1862) In the following subsections, we illustrate the definition and use of virtual functions by walking through the implementation of a variety of instances Each virtual member function illustrates a different aspect of object-oriented design Virtual Input/Output The first virtual operation we'd like to provide is that of printing a query either to standard output or to a file:

ostream& print( ostream &os = cout ) const;

Figure 10.15a F-117A Con guration (Courtesy of US Air Force)

We must declare print() to be virtual because each implementation is type dependent, but must be able to be invoked through a Query* pointer For example, for AndQuery, print() might look as follows:

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ostream& AndQuery::print( ostream &os ) const { _lop->print( os ); os " && "; _rop->print( os ); }

We must declare print() to be a virtual function of the Query abstract base class Otherwise, we cannot invoke print() through the Query* operand data members of the AndQuery, OrQuery, and NotQuery classes But there is no meaningful implementation of print() for the Query base class For the moment, we'll simply define it as a null function (Later, we'll redefine it as a pure virtual function)

class Query { public: virtual ostream& print( ostream &os=cout ) const {} // };

The base class first introducing a virtual function must specify the virtual keyword within the class declaration If the definition is placed outside the class, the keyword virtual must not again be specified For example, the following definition of print() results in a compile-time error:

// error: the keyword virtual can only appear // within the class definition virtual ostream& Query::print( ostream& ) const { }

The correct definition must not include the keyword virtual The class introducing the virtual function must either define it or declare it as a pure virtual function (again, for the moment, we are defining it as a null function) The derived class may either provide its own instance, which then becomes the active instance of that function for the derived class, or else it may inherit the active base class instance The derived class instance, if defined, is said to override the inherited base class instance Before we walk through the four derived class implementations, we first need to consider the presence of parentheses within a query For example, given the query

with permission.)

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fiery && ( bird || hair )

If our implementations of the print() instances do not reproduce the original parentheses, they'll be of small value to the user To keep track of the necessary left and right parentheses to generate, we retrofit a pair of nonstatic data members into our abstract Query base class together with their supporting access functions (this kind of member retrofitting is a normal part of evolving a class hierarchy):

F-117A engine exhaust ducts (Courtesy of US Air Force)

class Query { public: // // set _lparen and _rparen void lparen( short lp ) { _lparen = lp; } void rparen( short rp ) { _rparen = rp; } // get the value of _lparen and _rparen short lparen() { return _lparen; } short rparen() { return _rparen; } // print the left and right parens void print_lparen( short cnt, ostream& os ) const; void print_rparen( short cnt, ostream& os ) const; protected: // hold count of left and right parentheses short _lparen; short _rparen; // };

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_lparen represents the number of left parentheses a particular object should print; _rparen represents the number of right parentheses (In Section 177, we'll see how these numbers are calculated and how the two members are assigned) Here is an example of processing a highly "parenthesized" query:

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