std::mem_fun_ref_t,std::mem_fun1_ref_t,std::const_mem_fun_ref_t, (3) Linux Manual Page

std::mem_fun_ref_t,std::mem_fun1_ref_t,std::const_mem_fun_ref_t, – std::mem_fun_ref_t,std::mem_fun1_ref_t,std::const_mem_fun_ref_t,

Synopsis

template< class S, class T >

class mem_fun_ref_t : public unary_function<T, S>
{

  public:
    (1)(deprecated in C++ 11)

        explicit mem_fun_ref_t(S (T::*p)());
    (removed in C++ 17)

        S
        operator()(T &p) const;
};

template <class S, class T>
class const_mem_fun_ref_t : public unary_function<T, S>
{

  public:
    (2)(deprecated in C++ 11)

        explicit const_mem_fun_ref_t(S (T::*p)() const);
    (removed in C++ 17)

        S
        operator()(const T &p) const;
};

template <class S, class T, class A>
class mem_fun1_ref_t : public binary_function<T, A, S>
{

  public:
    (3)(deprecated in C++ 11)

        explicit mem_fun1_ref_t(S (T::*p)(A));
    (removed in C++ 17)

        S
        operator()(T &p, A x) const;
};

template <class S, class T, class A>
class const_mem_fun1_ref_t : public binary_function<T, A, S>

{
    (deprecated in C++ 11)

        public : (4)(removed in C++ 17)

                     explicit const_mem_fun1_ref_t(S (T::*p)(A) const);

    S operator()(const T &p, A x) const;
};

Wrapper around a member function pointer. The class instance whose member function
to call is passed as a reference 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

mem_fun_ref           creates a wrapper from a pointer to member function, callable
(deprecated in C++11) with a reference to object
(removed in C++17)    (function template)
mem_fun_t
mem_fun1_t            wrapper for a pointer to nullary or unary member function,
const_mem_fun_t       callable with a pointer to object
const_mem_fun1_t      (class template)
(deprecated in C++11)
(removed in C++17)