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<H2>Operators</H2>
<P><B>Library:</B>&nbsp;&nbsp;<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 &lt;utility&gt;

namespace rel_ops {
  template &lt;class T&gt;
  bool operator!=(const T&amp;, const T&amp;);

  template &lt;class T&gt;
  bool operator&gt;(const T&amp;, const T&amp;);

  template &lt;class T&gt;
  bool operator&lt;=(const T&amp;, const T&amp;);

  template &lt;class T&gt;
  bool operator&gt;=(const T&amp;, const T&amp;);
}
</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>&gt;</SAMP>, <SAMP>&lt;=</SAMP>, and <SAMP>&gt;=</SAMP> out of <SAMP>operator&lt;</SAMP>: </P>
<P>    <SAMP>operator!=(x,y)</SAMP> returns <SAMP>!(x==y)</SAMP></P>
<P>    <SAMP>operator&gt;(x,y)</SAMP>  returns <SAMP>y&gt;x</SAMP></P>
<P>    <SAMP>operator&lt;=(x,y)</SAMP> returns <SAMP>!(y&lt;x)</SAMP></P>
<P>    <SAMP>operator&gt;=(x,y)</SAMP> returns <SAMP>!(x&lt;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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