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#include <boost/tr1/functional.hpp>
or
#include <functional>
std::tr1::mem_fn
is a generalization of the standard functions std::mem_fun
and std::mem_fun_ref
. It supports member function
pointers with more than one argument, and the returned function object can
take a pointer, a reference, or a smart pointer to an object instance as
its first argument. mem_fn
also supports pointers to data members by treating them as functions taking
no arguments and returning a (const) reference to the member. For more information
refer to the Boost.Mem_fn documentation.
namespace std { namespace tr1 { template <class R, class T> unspecified mem_fn(R T::* pm); } // namespace tr1 } // namespace std
Configuration: Boost.Config should (automatically) define the macro BOOST_HAS_TR1_MEM_FN if your standard library implements this part of TR1.
Standard Conformity: The Boost implementation
does not produce functors that inherit from std::unary_function
or std::binary_function
, nor does it function correctly
with pointers to volatile member functions (these should be extremely rare
in practice however).