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Table of Contents | Index
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returns the static, compile-time type of the pointer
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This popular tutorial introduction to standard C++ has been completely updated, reorganized, and rewritten to help programmers learn the language faster and use it in a more modern, effective wayJust as C++ has evolved since the last edition, so has the authors' approach to teaching it They now introduce the C++ standard library from the beginning, giving 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 If the value of a pointer p is 0, then typeid(*p) throws a bad_typeid exception if the type of p Examples that take advantage of the library, and explain the features of C++, also show how to make the best use of the is a type with virtual functions If the type of p does not define any virtuals, then the value of language As in its previous editions, the book's authoritative discussion of fundamental C++ concepts and techniques makes p is irrelevant As when evaluating a sizeof expression (Section 58, p 167) the compiler it a valuable resource even for more experienced programmersProgram Faster and More Effectively with This Rewritten does not evaluate *p It uses the static type of p, which does not require that p itself be a valid Classic Restructured for quicker learning, using the C++ standard library Updated to teach the most current programming pointer 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 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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Exercises Section 1822
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Exercise 1817:
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Write an expression to dynamically cast a pointer to a Query_base to a pointer to an AndQuery Test the cast by using objects of AndQuery and of another query type Print a statement indicating whether the cast works and be sure that the output matches your expectations Write the same cast, but cast a Query_base object to a reference to AndQuery Repeat the test to ensure that your cast works correctly Write a typeid expression to see whether two Query_base pointers point to the same type Now check whether that type is an AndQuery
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Exercise 1818:
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Exercise 1819:
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1823 Using RTTI
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As an example of when RTTI might be useful, consider a class hierarchy for which we'd like to implement the equality operator Two objects are equal if they have the same value for a given set of their data members Each derived type may add its own data, which we will want to include when testing for equality Because the values considered in determining equality for a derived type might differ from
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those considered for the base type, we'll (potentially) need a different equality operator for each pair of types in the hierarchy Moreover, we'd like to be able to use a given type as either the left-hand or right-hand operand, so we'll actually need two operators for each pair C++ Primer, Fourth Edition of types
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By Stanley B Lippman,Jos e Lajoie,
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If our hierarchy Barbara E Moo types, we need four functions: has only two
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Publisher:Addison Wesley operator==(const Base&, const Base&) Professional operator==(const Derived&, const Derived&) Pub Date: February 14, 2005 operator==(const Derived&, const Base&); Print ISBN: 0-201-72148-1 operator==(const Base&, const Derived&); Pages: 912
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bool bool bool bool
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Table of Contents | Index
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But if our hierarchy has several types, the number of operators we must define expands This popular tutorial types we'd need C++ has been completely updated, reorganized, and rewritten need rapidlyfor only 3introduction to standard 9 operators If the hierarchy has 4 types, we'dto help 16, and programmers learn the language faster and use it in a more modern, effective wayJust as C++ has evolved since the last so on
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edition, so has the authors' approach to teaching it They now introduce the C++ standard library from the beginning, giving readers the think we could programs without first having to master a set of virtual Highlighting today's best We might means to write usefulsolve this problem by definingevery language detailfunctions that would practices, the equality write programs level safe, can be built quickly, and those virtuals, performance perform they show how totest at each that arein the hierarchy Given yet offer outstanding we could define Examples that take advantage of that operates on references to the show type That operator could a single equality operator the library, and explain the features of C++, alsobase how to make the best use of the language its its previous virtual equal operation discussion of do the real work delegate As inwork to aeditions, the book's authoritativethat would fundamental C++ concepts and techniques makes it a valuable resource even for more experienced programmersProgram Faster and More Effectively with This Rewritten
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Unfortunately, virtual functions are not C++ standard library Updatedproblem The trouble is deciding Classic Restructured for quicker learning, using the a good match to this to teach the most current programming on the type for design techniques Filledthe equal operation Virtual functionspoints, warn about common styles and program the parameter to with new learning aids that emphasize important must have the same parameter type(s) in both the baseand provide general usage tips Complete with exercisesvirtual equal pitfalls, suggest good programming practices, and derived classes That implies that a that reinforce skills operation must have a parameterits coverageThe source code for thebase class examples is available on learned Authoritative and comprehensive in that is a reference to the book's extended
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