196 lines
7.3 KiB
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196 lines
7.3 KiB
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<HTML>
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<HEAD>
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<TITLE>exception</TITLE>
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<LINK REL=StyleSheet HREF="../rw.css" TYPE="text/css" TITLE="Apache stdcxx Stylesheet"></HEAD>
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<BODY BGCOLOR=#FFFFFF>
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<A HREF="equal-to.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="exception-h.html"><IMG SRC="images/bnext.gif" WIDTH=25 HEIGHT=21 ALT="Next file" BORDER=O></A><DIV CLASS="DOCUMENTNAME"><B>Apache C++ Standard Library Reference Guide</B></DIV>
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<H2>exception</H2>
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<P><B>Library:</B> <A HREF="2-2.html">Language support</A></P>
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<PRE><HR><B><I>Does not inherit</I></B><HR></PRE>
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<UL>
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<LI><A HREF="#sec1">Local Index</A></LI>
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<LI><A HREF="#sec2">Summary</A></LI>
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<LI><A HREF="#sec3">Synopsis</A></LI>
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<LI><A HREF="#sec4">Interface</A></LI>
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<LI><A HREF="#sec5">Example</A></LI>
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<LI><A HREF="#sec6">Constructors</A></LI>
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<LI><A HREF="#sec7">Destructor</A></LI>
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<LI><A HREF="#sec8">Public Member Operator</A></LI>
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<LI><A HREF="#sec9">Public Member Function</A></LI>
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<LI><A HREF="#sec10">See Also</A></LI>
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<LI><A HREF="#sec11">Standards Conformance</A></LI>
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</UL>
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<A NAME="sec1"><H3>Local Index</H3></A>
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<H4>Members</H4>
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<UL><TABLE CELLPADDING=3>
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<TR><TD VALIGN=top>
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<A HREF="#idx628">exception()</A><BR>
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</TD>
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<TD VALIGN=top><A HREF="#idx631">operator=()</A><BR>
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</TD>
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<TD VALIGN=top><A HREF="#idx632">what()</A><BR>
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</TD>
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<TD VALIGN=top><A HREF="#idx630">~exception()</A><BR>
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</TD></TR>
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</TABLE></UL>
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<A NAME="sec2"><H3>Summary</H3></A>
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<P>Class <B><I>exception</I></B> is the base class that supports logic and runtime errors.</P>
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<A NAME="sec3"><H3>Synopsis</H3></A>
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<PRE>#include <exception>
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namespace std {
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class exception;
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}
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</PRE>
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<A NAME="sec4"><H3>Interface</H3></A>
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<UL><PRE>namespace std {
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class exception {
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public:
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exception() throw();
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exception(const exception&) throw();
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exception& operator=(const exception&) throw();
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virtual ~exception() throw();
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virtual const char* what() const throw();
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};
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}
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</PRE></UL>
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<A NAME="sec5"><H3>Example</H3></A>
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<UL><PRE>//
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// except.cpp
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//
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#include <iostream>
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#include <stdexcept>
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#ifndef _RWSTD_NO_EXCEPTIONS
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int main ()
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{
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try {
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// Enable exceptions in cin.
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std::cin.exceptions(std::ios::eofbit);
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// Clear all bits and set eofbit.
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std::cin.clear(std::ios::eofbit);
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}
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catch (const std::ios::failure &e) {
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std::cout << "Caught an exception: "
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<< e.what () << std::endl;
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}
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catch (const std::exception &e) {
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std::cout << "Caught an exception: "
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<< e.what () << std::endl;
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return 1; // Indicate failure.
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}
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catch (...) {
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std::cout << "Caught an unknown exception"
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<< std::endl;
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return 1; // Indicate failure.
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}
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return 0;
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}
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#else
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int main ()
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{
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std::cout << "Exceptions not supported." << std::endl;
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return 0;
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}
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#endif // _RWSTD_NO_EXCEPTIONS
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Program Output:
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Caught an exception: std::cin: stream object has set ios::eofbit
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</PRE></UL>
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<UL><PRE></PRE></UL>
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<A NAME="sec6"><H3>Constructors</H3></A>
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<A NAME="idx628"></A><PRE><B>exception</B>() throw();</PRE>
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<UL>
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<P>Default constructor. Constructs an object of class <B><I>exception</I></B>.</P>
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</UL>
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<A NAME="idx629"></A><PRE><B>exception</B>(const exception&) throw();</PRE>
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<UL>
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<P>Copy constructor. Copies an <B><I>exception</I></B> object.</P>
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</UL>
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<A NAME="sec7"><H3>Destructor</H3></A>
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<A NAME="idx630"></A><PRE>virtual <B>~exception</B>() throw();</PRE>
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<UL>
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<P>Destructor. Destroys an object of class <B><I>exception</I></B>.</P>
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</UL>
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<A NAME="sec8"><H3>Public Member Operator</H3></A>
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<A NAME="idx631"></A><PRE>exception&
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<B>operator=</B>(const exception&) throw();</PRE>
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<UL>
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<P>Assignment operator. Copies an <B><I>exception</I></B> object.</P>
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</UL>
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<A NAME="sec9"><H3>Public Member Function</H3></A>
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<A NAME="idx632"></A><PRE>virtual const char*
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<B>what</B>() const throw();</PRE>
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<UL>
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<P>Returns an implementation-defined, null-terminated byte string representing a human-readable message describing the exception. The message may be a null-terminated multibyte string, suitable for conversion and display as a <B><I><A HREF="wstring.html">wstring</A></I></B>.</P>
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</UL>
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<A NAME="sec10"><H3>See Also</H3></A>
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<P><A HREF="exceptions.html">Exceptions</A>, <B><I>bad_alloca</I></B>, <B><I><A HREF="bad-cast.html">bad_cast</A></I></B>, <B><I><A HREF="bad-exception.html">bad_exception</A></I></B>, <B><I><A HREF="bad-typeid.html">bad_typeid</A></I></B>, <B><I><A HREF="domain-error.html">domain_error</A></I></B>, <B><I><A HREF="invalid-argument.html">invalid_argument</A></I></B>, <B><I><A HREF="ios-base.html#failure">ios_base::failure</A></I></B>, <B><I><A HREF="length-error.html">length_error</A></I></B>, <B><I><A HREF="logic-error.html">logic_error</A></I></B>, <B><I><A HREF="out-of-range.html">out_of_range</A></I></B>, <B><I><A HREF="overflow-error.html">overflow_error</A></I></B>, <B><I><A HREF="range-error.html">range_error</A></I></B>, <B><I><A HREF="runtime-error.html">runtime_error</A></I></B>, <B><I><A HREF="underflow-error.html">underflow_error</A></I></B></P>
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<A NAME="sec11"><H3>Standards Conformance</H3></A>
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<P><I>ISO/IEC 14882:1998 -- International Standard for Information Systems --Programming Language C++, Section 19.1</I></P>
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<BR>
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<HR>
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