stl_function.h

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        private:
            _Ret (_Tp::*_M_f)();
    };

    /// One of the @link s20_3_8_memadaptors adaptors for member pointers@endlink.
    template <class _Ret, class _Tp>
        class const_mem_fun_t : public unary_function<const _Tp*, _Ret>
    {
        public:
            explicit
                const_mem_fun_t(_Ret (_Tp::*__pf)() const)
                : _M_f(__pf) {}

            _Ret
                operator()(const _Tp* __p) const
                { return (__p->*_M_f)(); }
        private:
            _Ret (_Tp::*_M_f)() const;
    };

    /// One of the @link s20_3_8_memadaptors adaptors for member pointers@endlink.
    template <class _Ret, class _Tp>
        class mem_fun_ref_t : public unary_function<_Tp, _Ret>
    {
        public:
            explicit
                mem_fun_ref_t(_Ret (_Tp::*__pf)())
                : _M_f(__pf) {}

            _Ret
                operator()(_Tp& __r) const
                { return (__r.*_M_f)(); }
        private:
            _Ret (_Tp::*_M_f)();
    };

    /// One of the @link s20_3_8_memadaptors adaptors for member pointers@endlink.
    template <class _Ret, class _Tp>
        class const_mem_fun_ref_t : public unary_function<_Tp, _Ret>
    {
        public:
            explicit
                const_mem_fun_ref_t(_Ret (_Tp::*__pf)() const)
                : _M_f(__pf) {}

            _Ret
                operator()(const _Tp& __r) const
                { return (__r.*_M_f)(); }
        private:
            _Ret (_Tp::*_M_f)() const;
    };

    /// One of the @link s20_3_8_memadaptors adaptors for member pointers@endlink.
    template <class _Ret, class _Tp, class _Arg>
        class mem_fun1_t : public binary_function<_Tp*, _Arg, _Ret>
    {
        public:
            explicit
                mem_fun1_t(_Ret (_Tp::*__pf)(_Arg))
                : _M_f(__pf) {}

            _Ret
                operator()(_Tp* __p, _Arg __x) const
                { return (__p->*_M_f)(__x); }
        private:
            _Ret (_Tp::*_M_f)(_Arg);
    };

    /// One of the @link s20_3_8_memadaptors adaptors for member pointers@endlink.
    template <class _Ret, class _Tp, class _Arg>
        class const_mem_fun1_t : public binary_function<const _Tp*, _Arg, _Ret>
    {
        public:
            explicit
                const_mem_fun1_t(_Ret (_Tp::*__pf)(_Arg) const)
                : _M_f(__pf) {}

            _Ret
                operator()(const _Tp* __p, _Arg __x) const
                { return (__p->*_M_f)(__x); }
        private:
            _Ret (_Tp::*_M_f)(_Arg) const;
    };

    /// One of the @link s20_3_8_memadaptors adaptors for member pointers@endlink.
    template <class _Ret, class _Tp, class _Arg>
        class mem_fun1_ref_t : public binary_function<_Tp, _Arg, _Ret>
    {
        public:
            explicit
                mem_fun1_ref_t(_Ret (_Tp::*__pf)(_Arg))
                : _M_f(__pf) {}

            _Ret
                operator()(_Tp& __r, _Arg __x) const
                { return (__r.*_M_f)(__x); }
        private:
            _Ret (_Tp::*_M_f)(_Arg);
    };

    /// One of the @link s20_3_8_memadaptors adaptors for member pointers@endlink.
    template <class _Ret, class _Tp, class _Arg>
        class const_mem_fun1_ref_t : public binary_function<_Tp, _Arg, _Ret>
    {
        public:
            explicit
                const_mem_fun1_ref_t(_Ret (_Tp::*__pf)(_Arg) const)
                : _M_f(__pf) {}

            _Ret
                operator()(const _Tp& __r, _Arg __x) const
                { return (__r.*_M_f)(__x); }
        private:
            _Ret (_Tp::*_M_f)(_Arg) const;
    };

    /// One of the @link s20_3_8_memadaptors adaptors for member pointers@endlink.
    template <class _Tp>
        class mem_fun_t<void, _Tp> : public unary_function<_Tp*, void>
        {
            public:
                explicit
                    mem_fun_t(void (_Tp::*__pf)())
                    : _M_f(__pf) {}

                void
                    operator()(_Tp* __p) const
                    { (__p->*_M_f)(); }
            private:
                void (_Tp::*_M_f)();
        };

    /// One of the @link s20_3_8_memadaptors adaptors for member pointers@endlink.
    template <class _Tp>
        class const_mem_fun_t<void, _Tp> : public unary_function<const _Tp*, void>
        {
            public:
                explicit
                    const_mem_fun_t(void (_Tp::*__pf)() const)
                    : _M_f(__pf) {}

                void
                    operator()(const _Tp* __p) const
                    { (__p->*_M_f)(); }
            private:
                void (_Tp::*_M_f)() const;
        };

    /// One of the @link s20_3_8_memadaptors adaptors for member pointers@endlink.
    template <class _Tp>
        class mem_fun_ref_t<void, _Tp> : public unary_function<_Tp, void>
        {
            public:
                explicit
                    mem_fun_ref_t(void (_Tp::*__pf)())
                    : _M_f(__pf) {}

                void
                    operator()(_Tp& __r) const
                    { (__r.*_M_f)(); }
            private:
                void (_Tp::*_M_f)();
        };

    /// One of the @link s20_3_8_memadaptors adaptors for member pointers@endlink.
    template <class _Tp>
        class const_mem_fun_ref_t<void, _Tp> : public unary_function<_Tp, void>
        {
            public:
                explicit
                    const_mem_fun_ref_t(void (_Tp::*__pf)() const)
                    : _M_f(__pf) {}

                void
                    operator()(const _Tp& __r) const
                    { (__r.*_M_f)(); }
            private:
                void (_Tp::*_M_f)() const;
        };

    /// One of the @link s20_3_8_memadaptors adaptors for member pointers@endlink.
    template <class _Tp, class _Arg>
        class mem_fun1_t<void, _Tp, _Arg> : public binary_function<_Tp*, _Arg, void>
        {
            public:
                explicit
                    mem_fun1_t(void (_Tp::*__pf)(_Arg))
                    : _M_f(__pf) {}

                void
                    operator()(_Tp* __p, _Arg __x) const
                    { (__p->*_M_f)(__x); }
            private:
                void (_Tp::*_M_f)(_Arg);
        };

    /// One of the @link s20_3_8_memadaptors adaptors for member pointers@endlink.
    template <class _Tp, class _Arg>
        class const_mem_fun1_t<void, _Tp, _Arg>
        : public binary_function<const _Tp*, _Arg, void>
        {
            public:
                explicit
                    const_mem_fun1_t(void (_Tp::*__pf)(_Arg) const)
                    : _M_f(__pf) {}

                void
                    operator()(const _Tp* __p, _Arg __x) const
                    { (__p->*_M_f)(__x); }
            private:
                void (_Tp::*_M_f)(_Arg) const;
        };

    /// One of the @link s20_3_8_memadaptors adaptors for member pointers@endlink.
    template <class _Tp, class _Arg>
        class mem_fun1_ref_t<void, _Tp, _Arg>
        : public binary_function<_Tp, _Arg, void>
        {
            public:
                explicit
                    mem_fun1_ref_t(void (_Tp::*__pf)(_Arg))
                    : _M_f(__pf) {}

                void
                    operator()(_Tp& __r, _Arg __x) const
                    { (__r.*_M_f)(__x); }
            private:
                void (_Tp::*_M_f)(_Arg);
        };

    /// One of the @link s20_3_8_memadaptors adaptors for member pointers@endlink.
    template <class _Tp, class _Arg>
        class const_mem_fun1_ref_t<void, _Tp, _Arg>
        : public binary_function<_Tp, _Arg, void>
        {
            public:
                explicit
                    const_mem_fun1_ref_t(void (_Tp::*__pf)(_Arg) const)
                    : _M_f(__pf) {}

                void
                    operator()(const _Tp& __r, _Arg __x) const
                    { (__r.*_M_f)(__x); }
            private:
                void (_Tp::*_M_f)(_Arg) const;
        };

    // Mem_fun adaptor helper functions.  There are only two:
    // mem_fun and mem_fun_ref.
    template <class _Ret, class _Tp>
        inline mem_fun_t<_Ret, _Tp>
        mem_fun(_Ret (_Tp::*__f)())
        { return mem_fun_t<_Ret, _Tp>(__f); }

    template <class _Ret, class _Tp>
        inline const_mem_fun_t<_Ret, _Tp>
        mem_fun(_Ret (_Tp::*__f)() const)
        { return const_mem_fun_t<_Ret, _Tp>(__f); }

    template <class _Ret, class _Tp>
        inline mem_fun_ref_t<_Ret, _Tp>
        mem_fun_ref(_Ret (_Tp::*__f)())
        { return mem_fun_ref_t<_Ret, _Tp>(__f); }

    template <class _Ret, class _Tp>
        inline const_mem_fun_ref_t<_Ret, _Tp>
        mem_fun_ref(_Ret (_Tp::*__f)() const)
        { return const_mem_fun_ref_t<_Ret, _Tp>(__f); }

    template <class _Ret, class _Tp, class _Arg>
        inline mem_fun1_t<_Ret, _Tp, _Arg>
        mem_fun(_Ret (_Tp::*__f)(_Arg))
        { return mem_fun1_t<_Ret, _Tp, _Arg>(__f); }

    template <class _Ret, class _Tp, class _Arg>
        inline const_mem_fun1_t<_Ret, _Tp, _Arg>
        mem_fun(_Ret (_Tp::*__f)(_Arg) const)
        { return const_mem_fun1_t<_Ret, _Tp, _Arg>(__f); }

    template <class _Ret, class _Tp, class _Arg>
        inline mem_fun1_ref_t<_Ret, _Tp, _Arg>
        mem_fun_ref(_Ret (_Tp::*__f)(_Arg))
        { return mem_fun1_ref_t<_Ret, _Tp, _Arg>(__f); }

    template <class _Ret, class _Tp, class _Arg>
        inline const_mem_fun1_ref_t<_Ret, _Tp, _Arg>
        mem_fun_ref(_Ret (_Tp::*__f)(_Arg) const)
        { return const_mem_fun1_ref_t<_Ret, _Tp, _Arg>(__f); }

    /** @}  */

} // namespace std

#endif /* _FUNCTION_H */

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