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| <HTML> |
| <HEAD> |
| <TITLE>exception</TITLE> |
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| <H2>exception</H2> |
| <P><B>Library:</B> <A HREF="2-2.html">Language support</A></P> |
| |
| <PRE><HR><B><I>Does not inherit</I></B><HR></PRE> |
| |
| <UL> |
| <LI><A HREF="#sec1">Local Index</A></LI> |
| <LI><A HREF="#sec2">Summary</A></LI> |
| <LI><A HREF="#sec3">Synopsis</A></LI> |
| <LI><A HREF="#sec4">Interface</A></LI> |
| <LI><A HREF="#sec5">Example</A></LI> |
| <LI><A HREF="#sec6">Constructors</A></LI> |
| <LI><A HREF="#sec7">Destructor</A></LI> |
| <LI><A HREF="#sec8">Public Member Operator</A></LI> |
| <LI><A HREF="#sec9">Public Member Function</A></LI> |
| <LI><A HREF="#sec10">See Also</A></LI> |
| <LI><A HREF="#sec11">Standards Conformance</A></LI> |
| </UL> |
| <A NAME="sec1"><H3>Local Index</H3></A> |
| <H4>Members</H4> |
| <UL><TABLE CELLPADDING=3> |
| <TR><TD VALIGN=top> |
| <A HREF="#idx628">exception()</A><BR> |
| </TD> |
| <TD VALIGN=top><A HREF="#idx631">operator=()</A><BR> |
| </TD> |
| <TD VALIGN=top><A HREF="#idx632">what()</A><BR> |
| </TD> |
| <TD VALIGN=top><A HREF="#idx630">~exception()</A><BR> |
| </TD></TR> |
| </TABLE></UL> |
| |
| <A NAME="sec2"><H3>Summary</H3></A> |
| <P>Class <B><I>exception</I></B> is the base class that supports logic and runtime errors.</P> |
| <A NAME="sec3"><H3>Synopsis</H3></A> |
| |
| <PRE>#include <exception> |
| |
| namespace std { |
| class exception; |
| } |
| </PRE> |
| <A NAME="sec4"><H3>Interface</H3></A> |
| |
| <UL><PRE>namespace std { |
| class exception { |
| public: |
| exception() throw(); |
| exception(const exception&) throw(); |
| exception& operator=(const exception&) throw(); |
| virtual ~exception() throw(); |
| virtual const char* what() const throw(); |
| }; |
| } |
| </PRE></UL> |
| <A NAME="sec5"><H3>Example</H3></A> |
| |
| <UL><PRE>// |
| // except.cpp |
| // |
| |
| #include <iostream> |
| #include <stdexcept> |
| |
| |
| #ifndef _RWSTD_NO_EXCEPTIONS |
| |
| int main () |
| { |
| try { |
| // Enable exceptions in cin. |
| std::cin.exceptions(std::ios::eofbit); |
| |
| // Clear all bits and set eofbit. |
| std::cin.clear(std::ios::eofbit); |
| } |
| catch (const std::ios::failure &e) { |
| std::cout << "Caught an exception: " |
| << e.what () << std::endl; |
| } |
| catch (const std::exception &e) { |
| std::cout << "Caught an exception: " |
| << e.what () << std::endl; |
| |
| return 1; // Indicate failure. |
| } |
| catch (...) { |
| std::cout << "Caught an unknown exception" |
| << std::endl; |
| |
| return 1; // Indicate failure. |
| } |
| |
| return 0; |
| } |
| |
| #else |
| |
| int main () |
| { |
| std::cout << "Exceptions not supported." << std::endl; |
| |
| return 0; |
| } |
| |
| |
| #endif // _RWSTD_NO_EXCEPTIONS |
| |
| Program Output: |
| |
| Caught an exception: std::cin: stream object has set ios::eofbit |
| </PRE></UL> |
| <UL><PRE></PRE></UL> |
| <A NAME="sec6"><H3>Constructors</H3></A> |
| |
| <A NAME="idx628"></A><PRE><B>exception</B>() throw();</PRE> |
| <UL> |
| <P>Default constructor. Constructs an object of class <B><I>exception</I></B>.</P> |
| </UL> |
| |
| |
| <A NAME="idx629"></A><PRE><B>exception</B>(const exception&) throw();</PRE> |
| <UL> |
| <P>Copy constructor. Copies an <B><I>exception</I></B> object.</P> |
| </UL> |
| |
| <A NAME="sec7"><H3>Destructor</H3></A> |
| |
| <A NAME="idx630"></A><PRE>virtual <B>~exception</B>() throw();</PRE> |
| <UL> |
| <P>Destructor. Destroys an object of class <B><I>exception</I></B>.</P> |
| </UL> |
| |
| <A NAME="sec8"><H3>Public Member Operator</H3></A> |
| |
| <A NAME="idx631"></A><PRE>exception& |
| <B>operator=</B>(const exception&) throw();</PRE> |
| <UL> |
| <P>Assignment operator. Copies an <B><I>exception</I></B> object.</P> |
| </UL> |
| |
| <A NAME="sec9"><H3>Public Member Function</H3></A> |
| |
| <A NAME="idx632"></A><PRE>virtual const char* |
| <B>what</B>() const throw();</PRE> |
| <UL> |
| <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> |
| </UL> |
| |
| <A NAME="sec10"><H3>See Also</H3></A> |
| <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> |
| <A NAME="sec11"><H3>Standards Conformance</H3></A> |
| <P><I>ISO/IEC 14882:1998 -- International Standard for Information Systems --Programming Language C++, Section 19.1</I></P> |
| |
| <BR> |
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