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| <H2>mem_fun, mem_fun_ref</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">Example</A></LI> |
| <LI><A HREF="#sec6">See Also</A></LI> |
| <LI><A HREF="#sec7">Standards Conformance</A></LI> |
| </UL> |
| <A NAME="sec1"><H3>Local Index</H3></A> |
| No Entries |
| <A NAME="sec2"><H3>Summary</H3></A> |
| <P>Function objects that adapt a pointer to a member function, to take the place of a global function</P> |
| <A NAME="sec3"><H3>Synopsis</H3></A> |
| |
| <PRE>#include <functional> |
| |
| namespace std { |
| template <class S, class T> class mem_fun_t; |
| template <class S, class T, class A> class mem_fun1_t; |
| template <class S, class T> class mem_fun_ref_t; |
| template <class S, class T, class A> class mem_fun1_ref_t; |
| |
| template <class S, class T> class const_mem_fun_t; |
| template <class S, class T, class A> class const_mem_fun1_t; |
| template <class S, class T> class const_mem_fun_ref_t; |
| template <class S, class T, class A> |
| class const_mem_fun1_ref_t; |
| |
| template<class S, class T> mem_fun_t<S,T> |
| mem_fun(S, (T::*f)()); |
| template<class S, class T> mem_fun_ref_t<S,T> |
| mem_fun_ref(S, (T::*f)()); |
| |
| template<class S, class T. class A> mem_fun1_t<S,T,A> |
| mem_fun(S, (T::*f)(A)); |
| template<class S, class T, class A> mem_fun1_ref_t<S,T,A> |
| mem_fun_ref(S, (T::*f)(A)); |
| |
| template<class S, class T> const_mem_fun_t<S,T> |
| mem_fun(S, (T::*f)() const); |
| template<class S, class T> const_mem_fun_ref_t<S,T> |
| mem_fun_ref(S, (T::*f)() const); |
| |
| template<class S, class T, class A> const_mem_fun1_t<S,T,A> |
| mem_fun(S, (T::*f)(A) const); |
| template<class S, class T, class A> |
| const_mem_fun1_ref_t<S,T,A> |
| mem_fun_ref(S, (T::*f)(A) const); |
| } |
| </PRE> |
| <A NAME="sec4"><H3>Description</H3></A> |
| <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> |
| <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> |
| <P>The accompanying function template simplifies the use of this facility by constructing an instance of the class on the fly. </P> |
| <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> |
| <A NAME="sec5"><H3>Example</H3></A> |
| |
| <UL><PRE>// |
| // mem_fun example |
| // |
| |
| #include <functional> |
| #include <list> |
| using namespace std; |
| |
| int main(void) |
| { |
| int a1[] = {2,1,5,6,4}; |
| int a2[] = {11,4,67,3,14}; |
| list<int> s1(a1,a1+5); |
| list<int> s2(a2,a2+5); |
| |
| // Build a list of lists |
| list<list<int>* > l; |
| l.insert(l.begin(),s1); |
| l.insert(l.begin(),s2); |
| |
| // Sort each list in the list |
| for_each(l.begin(),l.end(),mem_fun(&list<int>::sort)); |
| } |
| </PRE></UL> |
| <A NAME="sec6"><H3>See Also</H3></A> |
| <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> |
| <A NAME="sec7"><H3>Standards Conformance</H3></A> |
| <P><I>ISO/IEC 14882:1998 -- International Standard for Information Systems -- Programming Language C++, Section 20.3.8</I></P> |
| |
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