class template
<functional>
std::const_mem_fun_t
template <class S, class T> class const_mem_fun_t;
Generate function object class from const parameterless member (pointer 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_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
unary_function and is typically defined as:
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template <class S, class T>
class const_mem_fun_t : public unary_function <T*,S>
{
S (T::*pmem)() const;
public:
explicit const_mem_fun_t ( S (T::*p)() const ) : pmem (p) {}
S operator() (T* p) const
{ return (p->*pmem)(); }
};
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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 a pointer to an object of type T whose constant member is to be called.
See also
- mem_fun
- Convert member function to function object (pointer version) (function template)
- mem_fun_t
- Generate function object class from parameterless member (pointer version) (class template)
- const_mem_fun1_t
- Generate function object class from single-parameter const member (pointer version) (class template)
- unary_function
- Unary function object base class (class template)