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

      From cppreference.com
      <cpp‎ |utility‎ |functional
       
       
      Utilities library
       
      Function objects
      Function invocation
      (C++17)(C++23)
      Identity function object
      (C++20)
      Old binders and adaptors
      (until C++17*)
      (until C++17*)
      (until C++17*)
      (until C++17*)  
      (until C++17*)
      mem_fun_tmem_fun1_tconst_mem_fun_tconst_mem_fun1_t
      (until C++17*)(until C++17*)(until C++17*)(until C++17*)
      (until C++20*)
      (until C++20*)
      (until C++17*)(until C++17*)
      (until C++17*)(until C++17*)

      (until C++17*)
      (until C++17*)(until C++17*)(until C++17*)(until C++17*)
      (until C++20*)
      (until C++20*)
       
      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 theoperator().

      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.

      [edit]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)[edit]
      wrapper for a pointer to nullary or unary member function, callable with a reference to object
      (class template)[edit]
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