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extern/stdcxx/4.2.1/doc/stdlibref/negators.html
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extern/stdcxx/4.2.1/doc/stdlibref/negators.html
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Licensed to the Apache Software Foundation (ASF) under one or more
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<HTML>
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<HEAD>
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<TITLE>Negators</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="negate.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="new-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>Negators</H2>
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<P><B>Library:</B> <A HREF="2-4.html">General utilities</A></P><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">Description</A></LI>
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<LI><A HREF="#sec5">Interface</A></LI>
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<LI><A HREF="#sec6">Example</A></LI>
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<LI><A HREF="#sec7">See Also</A></LI>
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<LI><A HREF="#sec8">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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No Entries
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<A NAME="sec2"><H3>Summary</H3></A>
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<P>Function adaptors and function objects used to reverse the sense of predicate function objects</P>
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<A NAME="sec3"><H3>Synopsis</H3></A>
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<PRE>#include <functional>
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namespace std {
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template <class Predicate>
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class unary_negate;
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template <class Predicate>
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unary_negate<Predicate> not1(const Predicate&);
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template <class Predicate>
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class binary_negate;
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template <class Predicate>
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binary_negate<Predicate> not2(const Predicate&);
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}
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</PRE>
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<A NAME="sec4"><H3>Description</H3></A>
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<P>Negators <SAMP><A HREF="not1.html">not1()</A></SAMP> and <SAMP><A HREF="not2.html">not2()</A></SAMP> are functions that take predicate function objects as arguments and return predicate function objects with the opposite sense. Negators work only with function objects defined as subclasses of the classes <B><I><A HREF="unary-function.html">unary_function</A></I></B> and <B><I><A HREF="binary-function.html">binary_function</A></I></B>. <SAMP>not1()</SAMP> accepts and returns unary predicate function objects. <SAMP>not2()</SAMP> accepts and returns binary predicate function objects.</P>
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<P><B><I><A HREF="unary-negate.html">unary_negate</A></I></B> and <B><I><A HREF="binary-negate.html">binary_negate</A></I></B> are function object classes that include return types for the negators, <SAMP><A HREF="not1.html">not1()</A></SAMP> and <SAMP><A HREF="not2.html">not2()</A></SAMP>.</P>
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<A NAME="sec5"><H3>Interface</H3></A>
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<UL><PRE>namespace std {
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template <class Predicate>
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class unary_negate
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: public unary_function
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<typename Predicate::argument_type, bool> {
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public:
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explicit unary_negate (const Predicate&);
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bool operator() (const argument_type&) const;
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};
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template<class Predicate>
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unary_negate <Predicate> not1(const Predicate&);
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}
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template<class Predicate>
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class binary_negate
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: public binary_function
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<typename Predicate::first_argument_type,
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typename Predicate::second_argument_type, bool>
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{
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public:
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explicit binary_negate (const Predicate&);
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bool operator() (const first_argument_type&,
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const second_argument_type&) const;
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};
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template <class Predicate>
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binary_negate<Predicate> not2 (const Predicate&);
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</PRE></UL>
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<A NAME="sec6"><H3>Example</H3></A>
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<UL><PRE>//
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// negator.cpp
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//
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#include <functional> // for unary_function
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#include <iostream> // for boolalpha, cout, endl
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// Create a new predicate from unary_function.
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template <class Arg>
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struct is_odd : public std::unary_function<Arg, bool>
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{
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bool operator() (const Arg &arg1) const {
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return arg1 % 2 != 0;
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}
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};
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int main ()
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{
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std::less<int> less_func;
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// Use not2 on less.
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std::cout << std::boolalpha
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<< less_func (1, 4) << '\n'
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<< less_func (4, 1) << '\n'
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<< std::not2 (std::less<int>())(1, 4) << '\n'
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<< std::not2 (std::less<int>())(4, 1) << '\n';
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// Create an instance of our predicate.
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is_odd<int> odd;
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// Use not1 on our user defined predicate.
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std::cout << odd (1) << '\n'
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<< odd (4) << '\n'
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<< std::not1 (odd)(1) << '\n'
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<< std::not1 (odd)(4) << std::endl;
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return 0;
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}
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Program Output:
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</PRE></UL>
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<UL><PRE>true
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false
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false
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true
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true
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false
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false
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true
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</PRE></UL>
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<A NAME="sec7"><H3>See Also</H3></A>
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<P><A HREF="algorithms.html">Algorithms</A>, <B><I><A HREF="binary-function.html">binary_function</A></I></B>, <A HREF="functionobjects.html">Function Objects</A>, <B><I><A HREF="unary-function.html">unary_function</A></I></B></P>
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<A NAME="sec8"><H3>Standards Conformance</H3></A>
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<P><I>ISO/IEC 14882:1998 -- International Standard for Information Systems -- Programming Language C++, Section 20.3.5</I></P>
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<BR>
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