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C++ Primer, Fourth Edition By be able to print Querys using the normal (overloaded) output operator We'd like users to Stanley B Lippman,Jos e Lajoie, Barbara E Moo However, we also need the print operation to be virtualprinting a Query should print the Query_base object to which the Query points There's only one problem: only member functions can Publisher:Addison Wesley be virtual, but the output operator cannot be a member of the Query_base classes (Section 1421, Professional p514) Pub Date: February 14, 2005 Print ISBN: 0-201-72148-1 To obtain the necessary virtual behavior, our Query_base classes defined a virtual display Pages: 912 member, which the Query output operator will use:
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Table of Contents | Index
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inline std::ostream& operator<<(std::ostream &os, const Query &q) This popular tutorial introduction to standard C++ has been completely updated, reorganized, and rewritten to help { programmers return language faster and use it in a more modern, effective wayJust as C++ has evolved since the last learn the qdisplay(os); edition,} has the authors' approach to teaching it They now introduce the C++ standard library from the beginning, giving so
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readers the means to write useful programs without first having to master every language detail Highlighting today's best practices, they show how to write programs that are safe, can be built quickly, and yet offer outstanding performance Examples that take advantage of the library, and explain the features of C++, also show how to make the best use of the language As in its When we writeprevious editions, the book's authoritative discussion of fundamental C++ concepts and techniques makes it a valuable resource even for more experienced programmersProgram Faster and More Effectively with This Rewritten Classic Restructured for quicker learning, using the C++ standard library Updated to teach the most current programming styles and program design techniques Filled with new learning aids that emphasize important points, warn about common Query andq = Query(sought1) & Query(sought2); pitfalls,cout << "\nExecuted query: " << andq << endl; suggest good programming practices, and provide general usage tips Complete with exercises that reinforce skills learned Authoritative and comprehensive in its coverageThe source code for the book's extended examples is available on the Web at the address below
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the Query output operator is invoked That operator calls
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qdisplay(os)
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with q referring to the Query object that points to this AndQuery, an dos bound to cout When we write
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Query name(sought); cout << "\nExecuted Query for: " << name << endl;
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theWordQuery instance of display is called More generally, a call
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Query query = some_query; cout << query << endl;
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invokes the instance of display associated with the object that query addresses at that point in the execution of our program
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1595 The Derived Classes
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We next need to implement our concrete query classes The one interesting part about these classes is how they are represented The WordQuery class is most straightforward Its job is to hold the search word
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C++ Primer, Fourth Edition By Stanley B on one or two Query operands A NotQuery negates the result of another The other classes operate Lippman,Jos e Lajoie, Barbara E Moo Query Both AndQuery and OrQuery have two operands, which are actually stored in their common base class, BinaryQuery Publisher:Addison Wesley
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In each of these Professional operand(s) could be an object of any of the concrete Query_base classes, the classes: A NotQuery Date: February 14,to a WordQuery, an AndQuery , an OrQuery, or another Pub could be applied 2005 NotQuery To allow this flexibility, the operands must be stored as pointers to Query_base that Print ISBN: 0-201-72148-1 might point to any one of the concrete Query_base classes Pages: 912
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Table of Contents | Index
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However, rather than storing a Query_base pointer, our classes will themselves use the Query handle Just as user code is simplified by using a handle, we can simplify our own class code by using the same handle class We'll make the Query operand const because once a given This popular tutorial introduction to standard C++ has been completely updated, reorganized, operand(s) Query_base object is built, there are no operations that can change theand rewritten to help
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programmers learn the language faster and use it in a more modern, effective wayJust as C++ has evolved since the last
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Now thathas the authors' approach to for these They now introduce the C++ standardthemfrom the beginning, giving edition, so we know the design teaching it classes, we can implement library
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readers the means to write useful programs without first having to master every language detail Highlighting today's best practices, they show how to write programs that are safe, can be built quickly, and yet offer outstanding performance Examples that take Class TheWordQueryadvantage of the library, and explain the features of C++, also show how to make the best use of the language As in its previous editions, the book's authoritative discussion of fundamental C++ concepts and techniques makes it a valuable resource even for more experienced programmersProgram Faster AWordQuery is a kind of Query_base that looks for a specified and More Effectively with This map: word in a given query Rewritten Classic Restructured for quicker learning, using the C++ standard library Updated to teach the most current programming styles and program design techniques Filled with new learning aids that emphasize important points, warn about common pitfalls,class good programming practices,Query_base { usage tips Complete with exercises that reinforce skills suggest WordQuery: public and provide general learned Authoritative and comprehensive in its coverageThe source code for the book's extended examples is available on friend class Query; // Query uses the WordQuery constructor the Web at the address below WordQuery(const std::string &s): query_word(s) { }
// concrete class: WordQuery defines all inherited pure virtual functions std::set<line_no> eval(const TextQuery &t) const { return trun_query(query_word); } std::ostream& display (std::ostream &os) const { return os << query_word; } std::string query_word; // word for which to search };
LikeQuery_base, WordQuery has no public members; WordQuery must make Query a friend to allow Query to access the WordQuery constructor Each of the concrete query classes must define the inherited pure virtual functions The WordQuery operations are simple enough to define in the class body The eval member calls the query_text member of its TextQuery parameter passing it the string that was used to create this WordQuery Todisplay a WordQuery, we print the query_word