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extern/stdcxx/4.2.1/doc/stdlibref/mem-fun.html
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extern/stdcxx/4.2.1/doc/stdlibref/mem-fun.html
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<HTML>
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<HEAD>
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<TITLE>mem_fun, mem_fun_ref</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="max-element.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="memory-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>mem_fun, mem_fun_ref</H2>
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<P><B>Library:</B> <A HREF="2-4.html">General utilities</A></P>
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<PRE><HR><B><I>Does not inherit</I></B><HR></PRE>
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<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">Example</A></LI>
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<LI><A HREF="#sec6">See Also</A></LI>
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<LI><A HREF="#sec7">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 objects that adapt a pointer to a member function, to take the place of a global function</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 S, class T> class mem_fun_t;
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template <class S, class T, class A> class mem_fun1_t;
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template <class S, class T> class mem_fun_ref_t;
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template <class S, class T, class A> class mem_fun1_ref_t;
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template <class S, class T> class const_mem_fun_t;
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template <class S, class T, class A> class const_mem_fun1_t;
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template <class S, class T> class const_mem_fun_ref_t;
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template <class S, class T, class A>
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class const_mem_fun1_ref_t;
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template<class S, class T> mem_fun_t<S,T>
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mem_fun(S, (T::*f)());
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template<class S, class T> mem_fun_ref_t<S,T>
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mem_fun_ref(S, (T::*f)());
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template<class S, class T. class A> mem_fun1_t<S,T,A>
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mem_fun(S, (T::*f)(A));
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template<class S, class T, class A> mem_fun1_ref_t<S,T,A>
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mem_fun_ref(S, (T::*f)(A));
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template<class S, class T> const_mem_fun_t<S,T>
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mem_fun(S, (T::*f)() const);
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template<class S, class T> const_mem_fun_ref_t<S,T>
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mem_fun_ref(S, (T::*f)() const);
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template<class S, class T, class A> const_mem_fun1_t<S,T,A>
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mem_fun(S, (T::*f)(A) const);
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template<class S, class T, class A>
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const_mem_fun1_ref_t<S,T,A>
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mem_fun_ref(S, (T::*f)(A) const);
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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>The <B><I><A HREF="mem-fun.html">mem_fun</A></I></B> group of templates encapsulates a pointer to a member function. Each category of template (<B><I>mem_fun</I></B> or <B><I><A HREF="mem-fun.html">mem_fun_ref</A></I></B>) includes both a class template and a function template, where the class is distinguished by the addition of <SAMP>_t</SAMP> on the end of the name to identify it as a type. A set of class templates for const member functions exists, each with <SAMP>const_</SAMP> prepended to the name.</P>
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<P>The class's constructor takes a pointer to a member function and uses <SAMP>operator()</SAMP> to forward the call to that member function. The resulting object serves as a global function object for that member function. </P>
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<P>The accompanying function template simplifies the use of this facility by constructing an instance of the class on the fly. </P>
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<P>The library includes zero and one argument adaptors for containers of pointers and containers of references (<SAMP>_ref</SAMP>). This technique can be easily extended to include adaptors for two argument functions, and so on. </P>
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<A NAME="sec5"><H3>Example</H3></A>
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<UL><PRE>//
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// mem_fun example
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//
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#include <functional>
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#include <list>
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using namespace std;
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int main(void)
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{
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int a1[] = {2,1,5,6,4};
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int a2[] = {11,4,67,3,14};
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list<int> s1(a1,a1+5);
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list<int> s2(a2,a2+5);
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// Build a list of lists
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list<list<int>* > l;
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l.insert(l.begin(),s1);
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l.insert(l.begin(),s2);
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// Sort each list in the list
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for_each(l.begin(),l.end(),mem_fun(&list<int>::sort));
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}
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</PRE></UL>
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<A NAME="sec6"><H3>See Also</H3></A>
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<P><B><I><A HREF="binary-function.html">binary_function</A></I></B>, <A HREF="functionobjects.html">Function Objects</A>, <B><I><A HREF="pointer-to-unary-function.html">pointer_to_unary_function</A></I></B>, <SAMP><A HREF="ptr-fun.html">ptr_fun()</A></SAMP></P>
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<A NAME="sec7"><H3>Standards Conformance</H3></A>
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<P><I>ISO/IEC 14882:1998 -- International Standard for Information Systems -- Programming Language C++, Section 20.3.8</I></P>
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<BR>
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