104 lines
4.7 KiB
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104 lines
4.7 KiB
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Copyright 1999-2007 Rogue Wave Software, Inc.
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<HTML>
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<HEAD>
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<TITLE>Example Program: Exceptions</TITLE>
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<LINK REL=StyleSheet HREF="../rw.css" TYPE="text/css" TITLE="Apache stdcxx Stylesheet"></HEAD>
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<A HREF="18-3.html"><IMG SRC="images/bprev.gif" WIDTH=20 HEIGHT=21 ALT="Previous file" BORDER=O></A><A HREF="noframes.html"><IMG SRC="images/btop.gif" WIDTH=56 HEIGHT=21 ALT="Top of Document" BORDER=O></A><A HREF="booktoc.html"><IMG SRC="images/btoc.gif" WIDTH=56 HEIGHT=21 ALT="Contents" BORDER=O></A><A HREF="tindex.html"><IMG SRC="images/bindex.gif" WIDTH=56 HEIGHT=21 ALT="Index page" BORDER=O></A><A HREF="VI.html"><IMG SRC="images/bnext.gif" WIDTH=25 HEIGHT=21 ALT="Next file" BORDER=O></A><DIV CLASS="DOCUMENTNAME"><B>Apache C++ Standard Library User's Guide</B></DIV>
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<H2>18.4 Example Program: Exceptions</H2>
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<BLOCKQUOTE><HR><B>
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NOTE -- This program is in the file <code>tutorial/stdexcept.cpp</code>.
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</B><HR></BLOCKQUOTE>
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<A NAME="idx428"><!></A>
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<P>This following example program demonstrates the use of exceptions:</P>
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<UL><PRE>
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#include <string> // for string
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#include <stdexcept> // for exception, runtime_error, out_of_range
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#include <iostream> // for cout
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int main ()
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{
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// First we'll incite and catch an exception from the C++ Standard
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// library class std::string by attempting to replace a substring
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// starting at a position beyond the end of the string object.
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try {
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std::string ().replace (100, 1, 1, 'c');
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}
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catch (std::out_of_range &e) {
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// Print out the exception string, which in this implementation
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// includes the location and the name of the function that threw
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// the exception along with the reason for the exception.
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std::cout << "Caught an out_of_range exception: "
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<< e.what () << '\n';
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}
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catch (std::exception &e) {
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std::cout << "Caught an exception of an unexpected type: "
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<< e.what () << '\n';
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}
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catch (...) {
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std::cout << "Caught an unknown exception\n";
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}
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// Throw another exception.
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try {
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throw std::runtime_error ("a runtime error");
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}
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catch (std::runtime_error &e) {
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std::cout << "Caught a runtime_error exception: "
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<< e.what () << '\n';
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}
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catch (std::exception &e) {
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std::cout << "Caught an exception of an unexpected type: "
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<< e.what () << '\n';
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}
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catch (...) {
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std::cout << "Caught an unknown exception\n";
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}
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return 0;
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}
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</PRE></UL>
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<P>The exact output of the program is specific to the compiler used to compile it and to the location of the library headers but may look something like this:</P><UL><PRE>
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Caught an out_of_range exception: /usr/local/stdcxx/include/string.cc:422: std::string& std::string::replace(size_type, size_type, size_type, char_type): argument value 100 out of range [0, 0)
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Caught a runtime_error exception: a runtime error
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</UL></PRE>
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<BR>
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<HR>
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