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Showing content from https://cplusplus.com/reference/functional/const_mem_fun1_t/ below:

class template

std::const_mem_fun1_t

template <class S, class T, class A> class const_mem_fun1_t;

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

Generates a binary function object class from a constant member of class

that takes an argument of type

and returns a value of type

const_mem_fun1_t is generally used as a type. The function mem_fun (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_t : public binary_function <T*,A,S>
{
  S (T::*pmem)(A) const;
public:
  explicit mem_fun1_t ( S (T::*p)(A) const ) : pmem (p) {}
  S operator() (T* p, A x) const
    { return (p->*pmem)(x); }
};

Members

constructor: Constructs a binary function object class from const 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 a pointer to an object of type T whose const member is to be called with x as argument.