An adapter class that allows a non_const member function that takes no arguments to be called as a unary function object when initialized with a pointer argument.
A pointer to the member function of class Type to be converted to a function object.
The object that the _Pm member function is called on.
An adaptable unary function.
The template class stores a copy of _Pm, which must be a pointer to a member function of class Type, in a private member object. It defines its member function operator() as returning (_Pleft->* _Pm)( ).
The constructor of mem_fun_t is not usually used directly; the helper function mem_fun is used to adapt member functions. See mem_fun for an example of how to use member function adaptors.