Writing a Handler in .NET framework

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In the preceeding example we used a tHRow to avoid adding two Sales_items that represented By Stanley B Lippman,Jos e Lajoie, different books We imagined that the part of the program that added to Sales_items was Barbara E Moo separate from the part that communicated with the user The part that interacts with the user might contain code something like the following to handle the exception that was thrown:
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Publisher:Addison Wesley Professional Pub Date: February 14, 2005 while (cin >> item1 >> item2) { Print ISBN: 0-201-72148-1 try { Pages: 912 C++ Primer, Fourth Edition
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Table of Contents | Index
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// execute code that will add the two Sales_items // if the addition fails, the codethrows a runtime_error exception } catch (runtime_error err) { // remind the user that ISBN must match and prompt for another pair This popular tutorialcout << to standard C++ has been completely updated, reorganized, and rewritten to help introduction errwhat() << faster and use it in a Enter y or n" wayJust as programmers learn the language"\nTry Again more modern, effective<< endl;C++ has evolved since the last char approach to teaching it They now introduce the C++ standard library from the beginning, giving edition, so has the authors' c; cin >> c; readers the means to write useful programs without first having to master every language detail Highlighting today's best if (cin programs 'n') practices, they show how to write&& c ==that are safe, can be built quickly, and yet offer outstanding performance break; Examples that take advantage of the library,// break out of thewhile loop and explain the features of C++, also show how to make the best use of the } its previous editions, the book's authoritative discussion of fundamental C++ concepts and techniques makes language As in } it a valuable resource even for more experienced programmersProgram Faster and More Effectively with This Rewritten
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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 Following the TRy keyword is a block That block would invoke the extended examples is available on learned Authoritative and comprehensive in its coverageThe source code for the book's part of the program that processesSales_item objects That part might throw an exception of type runtime_error the Web at the address below
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Thistry block has a single catch clause, which handles exceptions of type runtime_error The statements in the block following the catch define the actions that will be executed if code inside the TRy block throws a runtime_error Our catch handles the error by printing a message and asking the user to indicate whether to continue If the user enters an ' n', then we break out of the while Otherwise the loop continues by reading two new Sales_items The prompt to the user prints the return from errwhat() We know that err has type runtime_error , so we can infer that what is a member function (Section 152, p 24) of the runtime_error class Each of the library exception classes defines a member function named what This function takes no arguments and returns a C-style character string In the case of runtime_error , the C-style string that what returns is a copy of the string that was used to initialize the runtime_error If the code described in the previous section threw an exception, then the output printed by this catch would be
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Data must refer to same ISBN Try Again Enter y or n
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Functions Are Exited during the Search for a Handler
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In complex systems the execution path of a program may pass through multiple TRy blocks before encountering code that actually throws an exception For example, a try block might call a function that contains a try , that calls another function with its own TRy , and so on The search for a handler reverses the call chain When an exception is thrown, the function that threw the exception is searched first If no matching catch is found, the function terminates, and the function that called the one that threw is searched for a matching catch If no handler is found, then that function also exits and the function that called it is searched;
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and so on back up the execution path until a catch of an appropriate type is found If no catch clause capable of handling the exception exists, program execution is transferred C++ named terminate to a library function Primer, Fourth Edition , which is defined in the exception header The behavior By system Lippman,Jos e Lajoie, of that function is Stanley B dependent, but it usually aborts the program
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