79 lines
4.5 KiB
HTML
79 lines
4.5 KiB
HTML
<!--
|
|
Licensed to the Apache Software Foundation (ASF) under one or more
|
|
contributor license agreements. See the NOTICE file distributed
|
|
with this work for additional information regarding copyright
|
|
ownership. The ASF licenses this file to you under the Apache
|
|
License, Version 2.0 (the License); you may not use this file
|
|
except in compliance with the License. You may obtain a copy of
|
|
the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
|
|
implied. See the License for the specific language governing
|
|
permissions and limitations under the License.
|
|
|
|
Copyright 1999-2007 Rogue Wave Software, Inc.
|
|
-->
|
|
|
|
<HTML>
|
|
<HEAD>
|
|
<TITLE>unary_function</TITLE>
|
|
<LINK REL=StyleSheet HREF="../rw.css" TYPE="text/css" TITLE="Apache stdcxx Stylesheet"></HEAD>
|
|
<BODY BGCOLOR=#FFFFFF>
|
|
<A HREF="typeinfo-h.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="unary-negate.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>
|
|
<H2>unary_function</H2>
|
|
<P><B>Library:</B> <A HREF="2-4.html">General utilities</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">Description</A></LI>
|
|
<LI><A HREF="#sec5">See Also</A></LI>
|
|
<LI><A HREF="#sec6">Standards Conformance</A></LI>
|
|
</UL>
|
|
<A NAME="sec1"><H3>Local Index</H3></A>
|
|
No Entries
|
|
<A NAME="sec2"><H3>Summary</H3></A>
|
|
<P>Function object base class for creating unary function objects</P>
|
|
<A NAME="sec3"><H3>Synopsis</H3></A>
|
|
|
|
<PRE>#include <functional>
|
|
|
|
namespace std {
|
|
template <class Arg, class Result>
|
|
struct unary_function{
|
|
typedef Arg argument_type;
|
|
typedef Result result_type;
|
|
};
|
|
}
|
|
</PRE>
|
|
<A NAME="sec4"><H3>Description</H3></A>
|
|
<P>Function objects are objects with an <SAMP>operator()</SAMP> defined. They are important for the effective use of the standard library's generic algorithms, because the interface for each algorithmic template can accept either an object with an <SAMP>operator()</SAMP> defined or a pointer to a function. The standard library includes both a standard set of function objects and a pair of classes that you can use as the base for creating your own function objects.</P>
|
|
<P>Function objects that take one argument are called <I>unary function objects.</I> Unary function objects are required to include the typedefs <SAMP>argument_type</SAMP> and <SAMP>result_type</SAMP>. The <B><I>unary_function</I></B> class makes the task of creating templatized unary function objects easier by providing the necessary typedefs for a unary function object. You can create your own unary function objects by inheriting from <B><I>unary_function</I></B>.</P>
|
|
<A NAME="sec5"><H3>See Also</H3></A>
|
|
<P><A HREF="functionobjects.html">Function Objects</A>, and <A HREF="../stdlibug/2.html">Chapter 2, "Iterators," in the<I> User's Guide</I></A></P>
|
|
<A NAME="sec6"><H3>Standards Conformance</H3></A>
|
|
<P><I>ISO/IEC 14882:1998 -- International Standard for Information Systems -- Programming Language C++, Section 20.3.1</I></P>
|
|
|
|
<BR>
|
|
<HR>
|
|
<A HREF="typeinfo-h.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="unary-negate.html"><IMG SRC="images/bnext.gif" WIDTH=20 HEIGHT=21 ALT="Next file" BORDER=O></A>
|
|
|
|
<!-- Google Analytics tracking code -->
|
|
<script src="http://www.google-analytics.com/urchin.js" type="text/javascript">
|
|
</script>
|
|
<script type="text/javascript">
|
|
_uacct = "UA-1775151-1";
|
|
urchinTracker();
|
|
</script>
|
|
<!-- end of Google Analytics tracking code -->
|
|
|
|
</BODY>
|
|
</HTML>
|