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Table of Contents | Index
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This popular tutorial introduction to standard C++ has been completely updated,from problem rewritten to help Exceptions let us separate problem detection reorganized, and programmers learn the language The partuse it in a program that detects a problem need not resolution faster and of the more modern, effective wayJust as C++ has evolved since the last edition, so has theknow how to deal with itThey now introduce the C++ standard library from the beginning, giving authors' approach to teaching it 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 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 Classic Restructured for quicker learning, using the C++ standard library Updated to teach the most current programming In C++, program design techniques Filled with new learning aids that emphasize important points, warn about common styles and exception handling relies on the problem-detecting part throwing an object to a handler The good programming practices,thatprovide general usage tips Complete to communicate about what pitfalls, suggest type and contents of and object allow the two parts with exercises that reinforce skills went wrong 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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Section 613 (p 215) introduced the basic concepts and mechanics of using exceptions in C++ In that section, we hypothesized that a more complex bookstore application might use exceptions to communicate about problems For example, the Sales_item addition operator might throw an exception if the isbn members of its operands didn't match: [View full width] // throws exception if both objects do not refer to the same isbn Sales_item operator+(const Sales_item& lhs, const Sales_item& rhs) { if (!lhssame_isbn(rhs)) throw runtime_error("Data must refer to same ISBN"); // ok, if we're still here the ISBNs are the same so it's okay to do the addition Sales_item ret(lhs); // copy lhs into a local object that we'll return ret += rhs; // add in the contents ofrhs return ret; // return a copy of ret }
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Those parts of the program that added Sales_item objects would use a TRy block in order to catch an exception if one occured:
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// part of the application that interacts with the user Sales_item item1, item2, sum; while (cin >> item1 >> item2) { // read two transactions try { sum = item1 + item2; // calculate their sum // usesum } catch (const runtime_error &e) {
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cerr << ewhat() << " Try again\n" << endl; } }
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C++ Primer, Fourth Edition By Stanley B Lippman,Jos e Lajoie, Barbara E Moo Publisher:Addison Wesley In this section we'll expand our coverage of these basics and cover some additional exceptionProfessional handling facilities Effective use of exception handling requires understanding what happens Pub Date: February 14, 2005 when an exception is thrown, what happens when it is caught, and the meanings of the objects Print ISBN: 0-201-72148-1 used to communicate what went wrong Pages: 912
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Table of Contents | Index
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1711 Throwing an Exception of Class Type
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This popular tutorial introduction to standard C++ has been completely updated, reorganized, and rewritten to which An exception is raised by throwing an object The type of that object determineshelp programmers be the language faster and use in a more is the effective wayJust as C++ has chain since matches handler willlearn invoked The selectedit handler modern, one nearest in the call evolved that the last edition, so of the object the type hasthe 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 ways can are similar to yet offer outstanding are passed Exceptions are thrown and caught in are safe,thatbe built quickly, andhow arguments performance to Examples that take advantage can library, object of any type that also be passed to the best use of the functions An exception of the be an and explain the features of C++, can show how to makea nonreference language As meaning editions, the book's possible to copy objects of that type parameter,in its previousthat it must be 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
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Recall that when for quicker learning, using the C++array orlibrary Updated to teach the most current is automatically Classic Restructured we pass an argument of standard function type, that argument programming converted to andesign techniques same automatic conversion happens for objects that are thrown styles and program pointer The Filled with new learning aids that emphasize important points, warn about common As a consequence, there are no exceptions of array or function typesexercises that reinforce skillsan pitfalls, suggest good programming practices, and provide general usage tips Complete with Instead, if we throw array, the thrown object is converted to a pointer to the firstbook's extendedthe array available on if learned Authoritative and comprehensive in its coverageThe source code for the element in examples is Similarly, we throw thefunction, the function is converted to a pointer to the function (Section 79, p 276) the Web at a address below When a throw is executed, the statement(s) following the throw are not executed Instead, control is transferred from the tHRow to the matching catch That catch might be local to the same function or might be in a function that directly or indirectly called the function in which the exception occurred The fact that control passes from one location to another has two important implications:
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1 Functions along the call chain are prematurely exited Section 1712 (p 691) discusses what happens when functions are exited due to an exception 2 In general, the storage that is local to a block that throws an exception is not around when the exception is handled Because local storage is freed while handling an exception, the object that is thrown is not stored locally Instead, the throw expression is used to initialize a special object referred to as theexception object The exception object is managed by the compiler and is guaranteed to reside in space that will be accessible to whatever catch is invoked This object is created by a throw, and is initialized as a copy of the expression that is thrown The exception object is passed to the corresponding catch and is destroyed after the exception is completely handled
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The exception object is created by copying the result of the thrown expression; that result must be of a type that can be copied
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