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#include "Queryh" int
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main() { NameQuery nm( "alice" ); NameQuery nm2( "emma" ); NotQuery nq1( &nm ); cout "notQuery 1: " nq1 endl; NotQuery nq2( nq1 ); cout "notQuery 2: " nq2 endl; NotQuery nq3( &nm2 ); cout "notQuery 3: " nq3 endl; nq3 = nq2; cout "notQuery 3 assigned nq2: " nq3 endl; AndQuery aq( &nq1, &nm2 ); cout "AndQuery : " aq endl; AndQuery aq2( aq ); cout "AndQuery 2: " aq2 endl; AndQuery aq3( &nm, &nm2 ); cout "AndQuery 3: " aq3 endl; aq2 = aq3; cout "AndQuery 2 after assign: " aq2 endl; }
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When compiled and executed, the program generates the following output:
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notQuery notQuery notQuery notQuery AndQuery AndQuery AndQuery AndQuery
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1: ! alice 2: ! alice 3: ! emma 3 assigned nq2: ! alice : ! alice && emma 2: ! alice && emma 3: alice && emma 2 after assign: alice && emma
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Exercise 1718 Implement the AndQuery and OrQuery copy constructors Exercise 1719 Implement the AndQuery and OrQuery copy assignment operators Exercise 1720 What are the likely indications that a class requires an explicit instance of a copy constructor and copy assignment operator
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A UserQuery Manager Class
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Given a query, such as
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fiery && ( bird || potato )
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our task is to build up the equivalent Query hierarchy:
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AndQuery NameQuery( "fiery" ) OrQuery NameQuery( "bird" ) NameQuery( "potato" )
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The question is, how can we best do this The process of evaluating the query resembles a finite state machine We begin with an empty state, and with each element of the query shift from one state to another until the entire query is evaluated The heart of our implementation is a large switch statement within an operation we've named eval_query() Each word of the query is read in turn from a string vector and is tested against each of the possible values the query might contain:
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vector<string >::iterator it = user_query->begin(), end_it = user_query->end(); for ( ; it != end_it; ++it ) switch( evalQueryString( *it )) { case WORD: evalWord( *it ); break; case AND: evalAnd(); break; case OR: evalOr(); break; case NOT: evalNot(); break; case LPAREN: ++_paren; ++_lparenOn; break; case RPAREN: --_paren; ++_rparenOn evalRParen(); break; }
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The five eval operations (evalWord(), evalAnd(), evalOr(), evalNot(), and evalRParen()) do the actual building of the Query hierarchy Before we look in detail at their implementation, let's first consider their organization
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One strategy is to define each as an individual function, as we did originally in 6 with our text query routines The user query and derived Query subtypes represent independent data on which the functions operate This represents a procedural programming model; one we choose not to pursue As we did in Section 614 in introducing a TextQuery class within which to encapsulate our 6 operations and data, we wish here to introduce a UserQuery class within which to encapsulate and manage these operations and data One data member is the string vector to contain the actual user query A second data member is a pointer of type Query* to address the hierarchical representation of the query built up in eval_query() Three additional members are defined to handle the processing of parentheses: _paren, to help us in altering the default precedence of operator evaluation (we'll give an example in a moment), and _lparenOn and _rparenOn to keep a count of the number and kind of parentheses associated with the current query node (we saw the use of these in Section 1751 in the discussion of the virtual print() function) In addition to these five members, we require two more Consider the following query: