TheQuery Class in .NET framework

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TheQuery Class
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Given the preceeding design, the Query class itself is quite simple:
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// handle class to manage the Query_baseinheritance hierarchy class Query { // these operators need access to theQuery_base* constructor friend Query operator~(const Query &); friend Query operator|(const Query&, const Query&); friend Query operator&(const Query&, const Query&); public: Query(const std::string&); // builds a new WordQuery // copy control to manage pointers and use counting Query(const Query &c): q(cq), use(cuse) { ++*use; } ~Query() { decr_use(); } Query& operator=(const Query&); // interface functions: will call corresponding Query_baseoperations std::set<TextQuery::line_no> eval(const TextQuery &t) const { return q->eval(t); } std::ostream &display(std::ostream &os) const { return q->display(os); } private: Query(Query_base *query): q(query), use(new std::size_t(1)) { } Query_base *q; std::size_t *use; void decr_use() { if (--*use == 0) { delete q; delete use; } } };
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We start by naming as friends the operators that create Query objects We'll see shortly why these C++ Primer, Fourth Edition operators need to be friends
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By Stanley B Lippman,Jos e Lajoie, Barbara for Query, we declare, but cannot yet define, the constructor that takes a In the public interfaceE Moo string That constructor creates a WordQuery object, so we cannot define the constructor until we Publisher:Addison Wesley have defined the WordQuery class Professional Pub Date: handle copy control and are the same as the corresponding members of The next three members February 14, 2005 Print theSales_item class ISBN: 0-201-72148-1 Pages: 912
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The last two | Index Table of Contents public
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members represent the interface for Query_base In each case, the Query operation uses its Query_base pointer to call the respective Query_base operation These operations are virtual The actual version that is called is determined at run time and will depend on the type of the object to which q points
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This popular tutorial introduction to standard C++ has been completely updated, reorganized, and rewritten to help programmers implementation of Query includes a constructor that takes a pointer to a the last Theprivatelearn the language faster and use it in a more modern, effective wayJust as C++ has evolved sinceQuery_base edition, This constructor stores in q the They now it is given and allocates a new use counter, which it objectso has the authors' approach to teaching it pointer introduce the C++ standard library from the beginning, giving readers the to one This constructor is private because we don't intend general user code to initializes means to write useful programs without first having to master every language detail Highlighting today's best define practices, they show how Instead, the that are safe, can needed for the operators that performance Query_base objects to write programs constructor is be built quickly, and yet offer outstanding create Query objects Examples the constructor is private, the operators had to be made friends Because 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 previous 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 TheQuery Overloaded learning, using the C++ standard library Updated to teach the most current programming Operators styles and program design techniques Filled with new learning aids that emphasize important points, warn about common pitfalls, suggest good programming practices, and provide general usage tips Complete with exercises that reinforce skills The|, Authoritative and comprehensive in its coverageThe source code for the book's objects,examples is available on & and ~ operators create OrQuery, AndQuery, and NotQuery extended respectively: learned the Web at the address below
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inline Query operator&(const Query &lhs, const Query &rhs) { return new AndQuery(lhs, rhs); } inline Query operator|(const Query &lhs, const Query &rhs) { return new OrQuery(lhs, rhs); } inline Query operator~(const Query &oper) { return new NotQuery(oper); }
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Each of these operations dynamically allocates a new object of a type derived from Query_base Thereturn (implicitly) uses the Query constructor that takes a pointer to a Query_base to create theQuery object from the Query_base pointer that the operation allocates For example the return statement in the ~ operator is equivalent to
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// allocate a new Not Query object // convert the resulting pointer to NotQuery to a pointer toQuery_base Query_base *tmp = new NotQuery(expr); return Query(tmp); // use Query constructor that takes a pointer to Query_base
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There is no operator to create a WordQuery Instead, we gave our Query class a constructor that takes a string That constructor generates a WordQuery to look for the given string
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