of Contents | Index in .NET

Create DataMatrix in .NET of Contents | Index
Table of Contents | Index
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Exercise 1413:
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Which other arithmetic operators, if any, do you think Sales_item ought to support Define those that you think the class should include
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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 inline bool Examples that take advantage of the library, and explain the features of C++, also show how to make the best use of the operator==(const Sales_item &lhs, const Sales_item &rhs) 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 // must be made a friend of Sales_item Classic Restructured for quicker learning, using the C++ standard library Updated to teach the most current programming return lhsunits_sold == rhsunits_sold && styles and program design techniques Filled with new learning aids that emphasize important points, warn about common lhsrevenue == rhsrevenue && pitfalls, suggest good programming practices, and provide general usage tips Complete with exercises that reinforce skills lhssame_isbn(rhs); 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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inline bool operator!=(const Sales_item &lhs, const Sales_item &rhs) { return !(lhs == rhs); // != defined in terms of operator== }
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The definition of these functions is trivial More important are the design principles that these functions embody: If a class defines the == operator, it defines it to mean that two objects contain the same data If a class has an operation to determine whether two objects of the type are equal, it is usually right to define that function as operator== rather than inventing a named operation Users will expect to be able to compare objects using ==, and doing so is easier than remembering a new name If a class defines operator==, it should also define operator!= Users will expect that if they can use one operator, then the other will also exist The equality and inequality operators should almost always be defined in terms of each other One operator should do the real work to compare objects The other should call the one that does the real work
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Classes that define operator== are easier to use with the standard library Some algorithms, such as find, use the == operator by C++ Primer, class defines default If a Fourth Edition ==, then these algorithms can be used on By class type without Lajoie, that Stanley B Lippman,Jos eany specialization
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Barbara E Moo Publisher:Addison Wesley Professional Pub Date: February 14, 2005 Print ISBN: 0-201-72148-1 Pages: 912
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1432 Relational Operators
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Table of Contents | Index
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Classes for which the equality operator is defined also often have relational operators In particular, because the associative containers and some of the algorithms use the less-than operator, it can be quite useful to define an operator<
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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 Although we might think our Sales_item class should support the relational operators, it turns edition, so has the authors' approach to teaching it They now introduce the C++ standard library from the beginning, giving out that it probably should not The reasons are somewhat subtle and deserve understanding readers the means to write useful programs without first having to master every language detail Highlighting today's best practices, they in 15, we might want to use an associative offer outstanding performance As we'll see show how to write programs that are safe, can be built quickly, and yet container to hold Sales_item Examples that take advantage of the library, and explain container, we'd want them make the by use of the transactions When we put objects into the the features of C++, also show how toordered best ISBN, and language care previous editions, the book's in two records were different wouldn't As in itswhether the sales dataauthoritative 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 learning, using the C++ standard library Updated to , that definition programming However, if we were to define operator< as comparison on isbnteach the most currentwould be styles and program design techniques definition learning aids that emphasize important points, warn about common incompatible with the obviousFilled with newof == If we had two transactions for the same ISBN, pitfalls, suggest good programming practices, and provide Yet, if the tips Complete with exercises that reinforce skills neither record would be less than the other general usage sales figures in those objects were learned Authoritative and comprehensive in its coverageThe source code for have two objects, neither of which different, then these objects would be != Ordinarily, if wethe book's extended examples is available on the Web at the address below is less than the other, then we expect that those objects are equal
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Because the logical definition of < is inconsistent with the logical definition of ==, it is better not to define < at all We'll see in 15 how to use a separate named function to compareSales_items when we want to store them in an associative container
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The associative containers, as well as some of the algorithms, use the< operator by default Ordinarily, the relational operators, like the equality operators, should be defined as nonmember functions
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C++ Primer, Fourth Edition By Stanley B Lippman,Jos e Lajoie, 144 Assignment Operators Barbara E Moo
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We covered the Publisher:Addison Wesley of class type to another object of its type in Section assignment of one object Professional 132 (p 482) The class assignment operator takes a parameter that is the class type Usually the parameter isPubconst February 14, 2005 a Date: reference to the class type However, the parameter could be the Print ISBN: 0-201-72148-1 class type or a non const reference to the class type This operator will be synthesized by the Pages: 912 compiler if we do not define it ourselves The class assignment operator must be a member of the of Contents | Index Table class so the compiler can know whether it needs to synthesize one Additional assignment operators that differ by the type of the right-hand operand can be defined for a class type For example, the library string class defines three assignment This popular In addition to the class assignment operator, which takes a const string& operators:tutorial introduction to standard C++ has been completely updated, reorganized, and rewritten to help as its programmers operand, the string class in a more modern, effective wayJust as that take a since the right-hand learn the language faster and use itdefines versions of assignmentC++ has evolvedC-style last edition, so has the authors' approach the right-hand operand the C++ standard library from the beginning, character string or a char as to teaching it They now introduceThese might be used as follows: giving
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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 string car ("Volks"); language As = its previous editions, the book's authoritative discussion of fundamental C++ concepts and techniques makes car in "Studebaker"; // string = const char* it a valuable resource even for more experienced programmersProgram Faster and More Effectively with This Rewritten string model; Classicmodel = 'T'; // learning, usingchar standard library Updated to teach the most current programming Restructured for quicker string = the C++ 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 To support these operations, the string class contains members that look like
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// illustration of assignment operators for class string class string { public: string& operator=(const string &); string& operator=(const char *); string& operator=(char); // };
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// s1 = s2; // s1 = "str"; // s1 = 'c';
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Assignment operators can be overloaded Unlike the compoundassignment operators, every assignment operator, regardless of parameter type, must be defined as a member function
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