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mem_fun_t Class

An adapter class that allows a non_const member function that takes no arguments to be called as a unary function object when initialized with a pointer argument.

template<class Result, class Type>
   struct mem_fun_t : public unary_function<Type *, Result> {
      explicit mem_fun_t(Result ( Type::* _Pm )( ) );
      Result operator()( Type* _Pleft ) const;


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

Return Value

An adaptable unary 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 (_Pleft->* _Pm)( ).


The constructor of mem_fun_t is not usually used directly; the helper function mem_fun is used to adapt member functions. See mem_fun for an example of how to use member function adaptors.

See Also

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