std::mem_fun_t, std::mem_fun1_t, std::const_mem_fun_t, std::const_mem_fun1_t
From cppreference.com
                    
                                        
                    < cpp | utility | functional
                    
                                                            
                    |   template< class S, class T >  class mem_fun_t : public unary_function<T*, S> {  | 
(1) | (deprecated) | 
|   template< class S, class T, class Arg >  class mem_fun1_t : public binary_function<T*, A, S> {  | 
(2) | (deprecated) | 
|   template< class S, class T >  class const_mem_fun_t : public unary_function<const T*, S> {  | 
(3) | (deprecated) | 
|   template< class S, class T, class A >  class const_mem_fun1_t : public binary_function<const T*, A, S> {  | 
(4) | (deprecated) | 
Wrapper around a member function pointer.
| This section is incomplete |