const_mem_fun_t

A function adaptor for a constant member.

  template<class S, class T> class const_mem_fun_t

  : public unary_function<T*, S>

  explicit const mem_fun(S (T::*p)() const);  

Provides a constant member to function object.

The constructor for const_mem_fun_t calls the member function that it is initialized with using a given pointer argument.