📄 una_4659.htm

📁 ARM编辑、编译软件
💻 HTM
字号:
<HTML><TITLE>unary_function</TITLE><BODY>
<A HREF="ref.htm"><IMG SRC="images/banner.gif"></A>
<P><STRONG>Click on the banner to return to the Class Reference home page.</STRONG></P>
<P>&copy;Copyright 1996 Rogue Wave Software</P>
<H2>unary_function</H2>
<HR><PRE>     Function Object</PRE><HR>
<A NAME="Summary"><H3>Summary</H3></A>
<P>Base class for creating unary function objects.</P>
<H3>Contents</H3>
<UL>
<A HREF="#Synopsis"><LI>Synopsis</LI></A>
<A HREF="#Description"><LI>Description</LI></A>
<A HREF="#See Also"><LI>See Also</LI></A>
</UL>
<A NAME="Synopsis"><H3>Synopsis</H3></A>
<PRE>#include &#60;functional></PRE>
<PRE>
template &#60;class Arg, class Result>
struct <B>unary_function</B>{
  typedef Arg argument_type;
  typedef Result result_type;
};
</PRE>
<A NAME="Description"><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 provides 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 provide the typedefs <SAMP>argument_type</SAMP> and <SAMP>result_type</SAMP>.  The <B><I>unary_function</B></I> class makes the task of creating templated 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</B></I>.</P>
<A NAME="See Also"><H3>See Also</H3></A>
<P><A HREF="Fun_7437.htm"><B><I>Function Objects</B></I></A>, and Function Objects Section in User's Guide.</P>
<HR>
<A HREF="tra_4787.htm"><IMG SRC="images/prev.gif"></A> <A HREF="ref.htm#contents"><IMG SRC="images/toc.gif"></A> <A HREF="una_8062.htm"><IMG SRC="images/next.gif"></A></BODY></HTML>
⌨️ 快捷键说明

复制代码 Ctrl + C
搜索代码 Ctrl + F
全屏模式 F11
切换主题 Ctrl + Shift + D
显示快捷键 ?
增大字号 Ctrl + =
减小字号 Ctrl + -