Conversions from Base to Derived in .NET

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There is no automatic conversion from the base class to a derived class We cannot use a base object when a derived object is required:
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Item_base base; Bulk_item* bulkP = &base; // error: can't convert base to derived Bulk_item& bulkRef = base; // error: can't convert base to derived
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Bulk_item bulk = base;
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// error: can't convert base to derived
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The reason that By Stanley B Lippman,Jos e Lajoie, there is no (automatic) conversion from base type to derived type is that a Barbara E Moo base object might be just thata base It does not contain the members of the derived type If we were allowed derived type, then we might attempt to use that to assign a base object to a Publisher: members that derived object to access Addison Wesleydo not exist
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Professional Pub Date: February 14, 2005 What is sometimes a bit more surprising is that the restriction on converting from base to Print ISBN: 0-201-72148-1 derived exists even when a base pointer or reference is actually bound to a derived object: Pages: 912
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Table of Contents | Index
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Bulk_item bulk; Item_base *itemP = &bulk; Bulk_item *bulkP = itemP;
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// ok: dynamic type is Bulk_item // error: can't convert base to derived
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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 no useful programs at compile time that every language detail Highlighting today's best The compiler haswrite way to knowwithout first having to master a specific conversion will actually be practices, they show The write programs that only at the static types of the pointer or performance safe at run timehow to compiler looks are safe, can be built quickly, and yet offer outstanding reference to Examples that take advantage of the library, and explain determine whether a conversion is legal 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 valuable resource even for know that the conversion from base to derived is safe, we can use Inathose cases when wemore experienced programmersProgram Faster and More Effectively with This Rewritten a Classic Restructured for quicker learning, 183) to override library Updated to teach the most current programming static_cast (Section 5124, p using the C++ standardthe compiler Alternatively, we could request styles and program design techniques Filled with new learning aids dynamic_cast, which is warn about common a conversion that is checked at run time by using athat emphasize important points,covered in Section pitfalls, (p 773) 1821suggest 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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C++ Primer, Fourth Edition By Stanley B Lippman,Jos e Lajoie, 154 Constructors and Copy Control Barbara E Moo Publisher:Addison consists The fact that each derived objectWesley of the (nonstatic) members defined in the derived class plus one orProfessional more base-class subobjects affects how derived-type objects are Pub assigned, and destroyed When we construct, copy, assign, or destroy an constructed, copied,Date: February 14, 2005 Print ISBN: also construct, object of derived type, we 0-201-72148-1 copy, assign, or destroy those base-class Pages: 912 subobjects
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Table of Contents | Index
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Constructors and the copy-control members are not inherited; each class defines its own constructor(s) and copy-control members As is the case for any class, synthesized versions of the default constructor and the copy-control members will be used if the class does not This popular tutorial introduction define its own versions to standard C++ has been completely updated, reorganized, and 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 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 Examples that take advantage of the library, and explain the features of C++, also show how to make the best use of the Constructors its previous editions, thefor base classesdiscussion ofnot themselves a derived class are language As in and copy control book's authoritative that are fundamental C++ concepts and techniques makes largely unaffected by for more experienced programmersProgram Faster and Morelike many we'veRewritten it a valuable resource even inheritance Our Item_base constructor looks Effectively with This seen before: 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, suggest good programming practices, and provide general usage tips Complete with exercises that reinforce skills Item_base(const std::string &book = "", learned Authoritative and comprehensive in its coverageThe source code for the book's extended examples is available on the Web at the addressdouble sales_price = 00): below
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