const_mem_fun1_ref_t Class
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const_mem_fun1_ref_t Class

An adapter class that allows a const member function that takes a single argument to be called as a binary function object when initialized with a reference argument.

template<class Result, class Type, class Arg>
   struct const_mem_fun1_ref_t
      : public binary_function<Type, Arg, Result> {
   explicit const_mem_fun1_ref_t( Result (Type::*_Pm )( Arg ) const );
      Result operator()(
         const Type& _Left,
         Arg _Right
      ) const;


A pointer to the member function of class Type to be converted to a function object.
The const object that the _Pm member function is called on.
The argument that is being given to _Pm.

Return Value

An adaptable binary function.


The template class stores a copy of _Pm, which must be a pointer to a member function of class Type, in a private member object. It defines its member function operator() as returning (_Left.* _Pm)(_Right) const.


The constructor of const_mem_fun1_ref_t is not usually used directly; the helper function mem_fun_ref is used to adapt member functions. See mem_fun_ref for examples of how to use member function adaptors.

See Also

<functional> Members | Thread Safety in the Standard C++ Library

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