class template
<functional>

std::const_mem_fun_ref_t

template <class S, class T> class const_mem_fun_ref_t;
Generate function object class from const parameterless member (reference version)
Generates an unary function object class from a constant parameterless member of class T that returns a value of type S.

const_mem_fun__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 unary_function and is typically defined as:

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template <class S, class T>
  class const_mem_fun_ref_t : public unary_function <T,S>
{
  S (T::*pmem)() const;
public:
  explicit const_mem_fun_ref_t ( S (T::*p)() const ) : pmem (p) {}
  S operator() (T& p) const
    { return (p.*pmem)(); }
};


Members

constructor
Constructs an unary function object class from constant member function p of class T. The return type of this member function shall be type compatible with type S.
S operator() (T& p) const
Member function taking one parameter. The argument expected for it is an object of type T whose constant member is to be called.

See also

mem_fun_ref
Convert member function to function object (reference version) (function template )
mem_fun_ref_t
Generate function object class from parameterless member (reference version) (class template )
const_mem_fun1_ref_t
Generate function object class from single-parameter const member (reference version) (class template )
unary_function
Unary function object base class (class template )

C++