Exception Specifications

An optional exception specification (also called a throw list) enumerates a list of exceptions that a function can throw. For example, consider the function declaration

int someFunction( double value )
 throw ( ExceptionA, ExceptionB, ExceptionC )
 // function body

In this definition, the exception specification, which begins with keyword throw immediately following the closing parenthesis of the function's parameter list, indicates that function someFunction can throw exceptions of types ExceptionA, ExceptionB and ExceptionC. A function can throw only exceptions of the types indicated by the specification or exceptions of any type derived from these types. If the function tHRows an exception that does not belong to a specified type, function unexpected is called, which normally terminates the program.

A function that does not provide an exception specification can tHRow any exception. Placing throw()an empty exception specificationafter a function's parameter list states that the function does not tHRow exceptions. If the function attempts to throw an exception, function unexpected is invoked. Section 16.7 shows how function unexpected can be customized by calling function set_unexpected.

Common Programming Error 16.7

Throwing an exception that has not been declared in a function's exception specification causes a call to function unexpected.

Error-Prevention Tip 16.3

The compiler will not generate a compilation error if a function contains a throw expression for an exception not listed in the function's exception specification. An error occurs only when that function attempts to throw that exception at execution time. To avoid surprises at execution time, carefully check your code to ensure that functions do not throw exceptions not listed in their exception specifications.

Introduction to Computers, the Internet and World Wide Web

Introduction to C++ Programming

Introduction to Classes and Objects

Control Statements: Part 1

Control Statements: Part 2

Functions and an Introduction to Recursion

Arrays and Vectors

Pointers and Pointer-Based Strings

Classes: A Deeper Look, Part 1

Classes: A Deeper Look, Part 2

Operator Overloading; String and Array Objects

Object-Oriented Programming: Inheritance

Object-Oriented Programming: Polymorphism


Stream Input/Output

Exception Handling

File Processing

Class string and String Stream Processing

Web Programming

Searching and Sorting

Data Structures

Bits, Characters, C-Strings and structs

Standard Template Library (STL)

Other Topics

Appendix A. Operator Precedence and Associativity Chart

Appendix B. ASCII Character Set

Appendix C. Fundamental Types

Appendix D. Number Systems

Appendix E. C Legacy Code Topics

Appendix F. Preprocessor

Appendix G. ATM Case Study Code

Appendix H. UML 2: Additional Diagram Types

Appendix I. C++ Internet and Web Resources

Appendix J. Introduction to XHTML

Appendix K. XHTML Special Characters

Appendix L. Using the Visual Studio .NET Debugger

Appendix M. Using the GNU C++ Debugger


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C++ How to Program
C++ How to Program (5th Edition)
ISBN: 0131857576
EAN: 2147483647
Year: 2004
Pages: 627
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