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The implementation of our text query system is composed of three components: (1) the object-based TextQuery class, which does the actual text processing (again, it's detailed in Section 614); (2) the object-oriented Query class hierarchy to represent and evaluate each user query; and (3) the object-based UserQuery class, which represents a form of finite-state machine to build up the Query hierarchy Up until now, we have implemented these three components largely independent of one another and without conflict Unfortunately, that's no longer the case Do you see the problem The Query class hierarchy does not support the object construction requirements imposed on it by the UserQuery implementation through which we've just traced! 1 The AndQuery, OrQuery, and NotQuery classes currently require each of their respective operands to be present at the time of each object's definition Our processing, however, requires that we define an incomplete object 2 Our processing requires that we subsequently add an operand to the AndQuery, OrQuery, and NotQuery classes Moreover, this must be a virtual operation We must add the operand through the Query* pointer pushed onto _current_op However, adding the operand is type-dependent based on whether it is a unary operation (NotQuery) or a binary operation (OrQuery and AndQuery) As defined, our Query class hierarchy does not provide this operation What has happened is that the domain analysis yielded an interface at odds with the actual implementation of the design It is not that the analysis was incorrect, but simply incomplete This is more or less a problem to the degree that the phases of analysis, design, and implementation are separate and viewed as a sequential waterfall with no allowance for feedback and revision Fundamentally, we must accept the fact that we cannot think of or anticipate everything The difficulty is distinguishing both in our minds and in those of our management between the inevitable missteps of a complex process and the mistakes due to an individual's lack of thoroughness due either to inattention or lack of time In this case we must either ourselves go back and modify the Query class hierarchy or negotiate to have those changes made In an ineffective organization, recriminations will delay implementation, and projects will become progressively less ambitious and more bureaucratic In our case, as the authors of the text, we'll simply go in and twiddle the code, modifying the subtype constructors and adding a virtual add_op() member function to support adding operands to an operator after it has been defined (we'll see its use in a moment when we look at the evalRParen() and evalWord() operations) Defining the UserQuery Class A UserQuery object can either be initialized with a pointer to a string vector representing a user query, or subsequently passed the address of a user query through the query() member function This permits a single query object to be used for multiple user queries The actual building up of the Query class hierarchy is carried out by the eval_query() operation For example:. asp.net ean 13 EAN - 13 ASP . NET Control - EAN - 13 barcode generator with free ...
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Free download for .NET EAN 13 Barcode Generator trial package to create & generate EAN 13 barcodes in ASP . NET , WinForms applications using C# & VB. // define an instance without an associated user query UserQuery user_query; string text; vector<string> query_text; // cycle through each user request file:///F|/WinDDK/resources/CPPPrimer/c++primerhtm (863 / 1065) [2001-3-29 11:32:13] sending rates, or for more connections. The above results justify the higher effect of scheduling at greater contention and for the need to consider scheduling formulation for an effective routing at interference hot-spots. do { >> text ) query_textpush_back( text ); // pass the query to UserQuery object user_queryquery( &query_text ); // evaluate the query and return // root of the Query* hierarchy Query *query = user_queryeval_query(); } while ( /* user-wishes-to-continue-querying-text */ ); while( cin Here is our definition of our UserQuery class: asp.net ean 13 Reading barcode EAN 13 in asp . net , C# - CodeProject
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19 Apr 2005 ... NET 2005 - 7.40 Kb ... The EAN - 13 barcode is composed of 13 digits, which are made up of the following sections: the first 2 or 3 digits are the ... #ifndef USER_QUERY_H #define USER_QUERY_H #include <string> #include <vector> #include <map> #include <stack> typedef pair<short,short> location; typedef vector<location,allocator> loc; #include "Queryh" class UserQuery { public: UserQuery( vector< string,allocator > *pquery = 0 ) : _query( pquery ), _eval( 0 ), _paren( 0 ) {} Query *eval_query(); // builds the hierarchy void query( vector< string,allocator > *pq ); void displayQuery(); static void word_map( map<string,loc*,less<string>,allocator> *pwm ) { if ( !_word_map ) _word_map = pwm; } private: enum QueryType { WORD = 1, AND, OR, NOT, RPAREN, LPAREN }; QueryType evalQueryString( const string &query ); void evalWord( const string &query ); void evalAnd(); void evalOr(); void evalNot(); void evalRParen(); bool integrity_check(); int _paren; Query *_eval; vector<string> *_query; stack<Query*,vector<Query*> > _query_stack; stack<Query*,vector<Query*> > _current_op; static short _lparenOn, _rparenOn; static map<string,loc*,less<string>,allocator> *_word_map; }; #endif file:///F|/WinDDK/resources/CPPPrimer/c++primerhtm (864 / 1065) [2001-3-29 11:32:13] asp.net ean 13 .NET EAN 13 Generator for C#, ASP . NET , VB.NET | Generating ...
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NET Core Barcode is a cross-platform Portable Class Library that generates barcodes using barcode fonts. It supports Windows, macOS and Linux, and can be ... 77 CONCLUSIONS AND FUTURE WORK In this chapter, we discussed the effect of interference on the design of routing protocols We showed the progression of routing protocol development with respect to this problem The rst-generation routing protocols were based on hop count In realistic settings, it became evident that hop count does not provide high-quality routes This led to the development of link-quality-aware routing the second generation of routing protocols These protocols estimate link quality in a number of ways and expose this estimate to the routing layer to enable more informed routing decisions We described the problems of estimating link quality and combining link qualities into route quality We also overviewed and classi ed existing approaches to this problem While link-quality-aware routing provide signi cantly improves on the performance of hop-count-based routing, it still fails to provide an optimal routing con guration that optimizes the network usage. Notice that we declared our two stacks to contain elements of type pointer to Query rather than the Query objects themselves While both implementations support the correct application behavior, storing the objects directly is considerably less efficient: Each object (and its operands) must be memberwise copied onto the stack (each operand, recall, is memberwise copied by a virtual invocation of clone()), then subsequently destroyed Unless we are actually modifying the class objects we place within a container, storing them by pointer is significantly more efficient Here are the various eval operations We've defined each to be inline The evalAnd() and evalOr() operations execute the following steps: Each pops _query_stack (this takes two operations with the standard library stack class, recall: top() to get the element and pop() to remove it from the stack One or the other allocates either an AndQuery or an OrQuery object from the heap, passing it the object retrieved from _query_stack Each passes the AndQuery or OrQuery object the count of any left and right parentheses the operator needs to output on displaying itself Finally, each pushes the incomplete operator onto _current_op: Examples 16.5 Assume that B 10 and ulp 1024, so that the numbers are represented in the form s.10e, where 1 s 9.9999. 1. Compute z (3.4375 103)/(2.5491 1021): z 1:3485152 102 , 1:3485152 ! 1, rounding: s 1:3485, z 1:3485 102 : 2. Compute z (2.5491 1021)/(3.4375 103): z 0:74155564 10 4 , normalization: s 7:4155564, e 5, rounding: s 7:4156, z 7:4156 10 5 : Comment 16.4 The quotient of two real numbers could produce an under ow, as the nal value of e could be smaller than emin. 16.2.6 Square Root inline void UserQuery:: evalAnd() { Query *pop = _query_stacktop(); _query_stackpop(); AndQuery *pq = new AndQuery( pop ); if ( _lparenOn ) { pq->lparen( _lparenOn ); _lparenOn = 0; } if ( _rparenOn ) { pq->rparen( _rparenOn ); _rparenOn = 0; } _current_oppush( pq ); } inline void UserQuery:: evalOr() { Query *pop = _query_stacktop(); _query_stackpop(); OrQuery *pq = new OrQuery( pop ); if ( _lparenOn ) { pq->lparen( _lparenOn ); _lparenOn = 0; } if ( _rparenOn ) { pq->rparen( _rparenOn ); _rparenOn = 0; } _current_oppush( pq ); } asp.net ean 13 EAN - 13 Barcode Generator for ASP . NET Web Application
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