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std::mem_fun_t, std::mem_fun1_t, std::const_mem_fun_t, std::const_mem_fun1_t

Defined in header <functional> 
template< class S, class T > 
class mem_fun_t : public unary_function<T*,S> {
public:
    explicit mem_fun_t(S (T::*p)());
    S operator()(T* p) const;
};
 (1) (deprecated in C++11)
(removed in C++17) 
template< class S, class T > 
class const_mem_fun_t : public unary_function<const T*,S> {
public:
    explicit const_mem_fun_t(S (T::*p)() const);
    S operator()(const T* p) const;
};
 (2) (deprecated in C++11)
(removed in C++17) 
template< class S, class T, class A > 
class mem_fun1_t : public binary_function<T*,A,S> {
public:
    explicit mem_fun1_t(S (T::*p)(A));
    S operator()(T* p, A x) const;
};
 (3) (deprecated in C++11)
(removed in C++17) 
template< class S, class T, class A > 
class const_mem_fun1_t : public binary_function<const T*,A,S> {
public:
    explicit const_mem_fun1_t(S (T::*p)(A) const);
    S operator()(const T* p, A x) const;
};
 (4) (deprecated in C++11)
(removed in C++17)

Wrapper around a member function pointer. The class instance whose member function to call is passed as a pointer to the operator().

1) Wraps a non-const member function with no parameters.
2) Wraps a const member function with no parameters.
3) Wraps a non-const member function with a single parameter.
4) Wraps a const member function with a single parameter.

See also

(deprecated in C++11)(removed in C++17)
 creates a wrapper from a pointer to member function, callable with a pointer to object
(function template)
(deprecated in C++11)(removed in C++17)
 wrapper for a pointer to nullary or unary member function, callable with a reference to object
(class template)

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https://en.cppreference.com/w/cpp/utility/functional/mem_fun_t