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Showing content from https://cplusplus.com/reference/functional/mem_fun1_ref_t/ below:

class template

std::mem_fun1_ref_t

template <class S, class T, class A> class mem_fun1_ref_t;

Generate function object class from single-parameter member (reference version)

Generates a binary function object class from a member of class

that takes an argument of type

and returns a value of type

mem_fun1_ref_t is generally used as a type. The function mem_fun_ref (also defined in header <functional>) can be used to directly construct an object of this type.

This class is derived from binary_function and is typically defined as:

template <class S, class T, class A>
  class mem_fun1_ref_t : public binary_function <T,A,S>
{
  S (T::*pmem)(A);
public:
  explicit mem_fun1_ref_t ( S (T::*p)(A) ) : pmem (p) {}
  S operator() (T& p, A x) const
    { return (p.*pmem)(x); }
};

Members

constructor: Constructs a binary function object class from member function p of class T. The return type of this member function shall be type compatible with type S.
S operator() (T* p, A x): Member function taking two parameters: p is an object of type T whose member is to be called with x as argument.