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| <H2>Operators</H2> |
| <P><B>Library:</B> <A HREF="2-4.html">General utilities</A></P><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">Description</A></LI> |
| <LI><A HREF="#sec5">Standards Conformance</A></LI> |
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| <A NAME="sec1"><H3>Local Index</H3></A> |
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| <A NAME="sec2"><H3>Summary</H3></A> |
| <P>Operators for the C++ Standard Template Library</P> |
| <A NAME="sec3"><H3>Synopsis</H3></A> |
| |
| <PRE>#include <utility> |
| |
| namespace rel_ops { |
| template <class T> |
| bool operator!=(const T&, const T&); |
| |
| template <class T> |
| bool operator>(const T&, const T&); |
| |
| template <class T> |
| bool operator<=(const T&, const T&); |
| |
| template <class T> |
| bool operator>=(const T&, const T&); |
| } |
| </PRE> |
| <A NAME="sec4"><H3>Description</H3></A> |
| <P>The STL includes the following operators to avoid redundant definitions of <SAMP>operator!=</SAMP> out of <SAMP>operator==</SAMP>, and of operators <SAMP>></SAMP>, <SAMP><=</SAMP>, and <SAMP>>=</SAMP> out of <SAMP>operator<</SAMP>: </P> |
| <P> <SAMP>operator!=(x,y)</SAMP> returns <SAMP>!(x==y)</SAMP></P> |
| <P> <SAMP>operator>(x,y)</SAMP> returns <SAMP>y>x</SAMP></P> |
| <P> <SAMP>operator<=(x,y)</SAMP> returns <SAMP>!(y<x)</SAMP></P> |
| <P> <SAMP>operator>=(x,y)</SAMP> returns <SAMP>!(x<y)</SAMP></P> |
| <P>To avoid clashes with other global operators, these definitions are contained in the namespace <SAMP>rel_ops</SAMP>. To use them, either scope explicitly or include a using declaration, such as <SAMP>using namespace rel_ops</SAMP>.</P> |
| <A NAME="sec5"><H3>Standards Conformance</H3></A> |
| <P><I>ISO/IEC 14882:1998 -- International Standard for Information Systems -- Programming Language C++, Section 20.2</I></P> |
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