stl_function.h

mingw32.rar

    inline binder2nd<_Operation>
    bind2nd(const _Operation& __fn, const _Tp& __x)
    {
      typedef typename _Operation::second_argument_type _Arg2_type;
      return binder2nd<_Operation>(__fn, _Arg2_type(__x));
    }
  /** @}  */

  // 20.3.7 adaptors pointers functions
  /** @defgroup s20_3_7_adaptors Adaptors for pointers to functions
   *  The advantage of function objects over pointers to functions is that
   *  the objects in the standard library declare nested typedefs describing
   *  their argument and result types with uniform names (e.g., @c result_type
   *  from the base classes @c unary_function and @c binary_function).
   *  Sometimes those typedefs are required, not just optional.
   *
   *  Adaptors are provided to turn pointers to unary (single-argument) and
   *  binary (double-argument) functions into function objects.  The
   *  long-winded functor @c pointer_to_unary_function is constructed with a
   *  function pointer @c f, and its @c operator() called with argument @c x
   *  returns @c f(x).  The functor @c pointer_to_binary_function does the same
   *  thing, but with a double-argument @c f and @c operator().
   *
   *  The function @c ptr_fun takes a pointer-to-function @c f and constructs
   *  an instance of the appropriate functor.
   *
   *  @{
   */
  /// One of the @link s20_3_7_adaptors adaptors for function pointers@endlink.
  template <class _Arg, class _Result>
    class pointer_to_unary_function : public unary_function<_Arg, _Result>
    {
    protected:
      _Result (*_M_ptr)(_Arg);
    public:
      pointer_to_unary_function() {}

      explicit
      pointer_to_unary_function(_Result (*__x)(_Arg))
      : _M_ptr(__x) {}

      _Result
      operator()(_Arg __x) const
      { return _M_ptr(__x); }
    };

  /// One of the @link s20_3_7_adaptors adaptors for function pointers@endlink.
  template <class _Arg, class _Result>
    inline pointer_to_unary_function<_Arg, _Result>
    ptr_fun(_Result (*__x)(_Arg))
    { return pointer_to_unary_function<_Arg, _Result>(__x); }

  /// One of the @link s20_3_7_adaptors adaptors for function pointers@endlink.
  template <class _Arg1, class _Arg2, class _Result>
    class pointer_to_binary_function
    : public binary_function<_Arg1, _Arg2, _Result>
    {
    protected:
      _Result (*_M_ptr)(_Arg1, _Arg2);
    public:
      pointer_to_binary_function() {}

      explicit
      pointer_to_binary_function(_Result (*__x)(_Arg1, _Arg2))
      : _M_ptr(__x) {}

      _Result
      operator()(_Arg1 __x, _Arg2 __y) const
      { return _M_ptr(__x, __y); }
    };

  /// One of the @link s20_3_7_adaptors adaptors for function pointers@endlink.
  template <class _Arg1, class _Arg2, class _Result>
    inline pointer_to_binary_function<_Arg1, _Arg2, _Result>
    ptr_fun(_Result (*__x)(_Arg1, _Arg2))
    { return pointer_to_binary_function<_Arg1, _Arg2, _Result>(__x); }
  /** @}  */

  template <class _Tp>
    struct _Identity : public unary_function<_Tp,_Tp>
    {
      _Tp&
      operator()(_Tp& __x) const
      { return __x; }

      const _Tp&
      operator()(const _Tp& __x) const
      { return __x; }
    };

  template <class _Pair>
    struct _Select1st : public unary_function<_Pair,
					      typename _Pair::first_type>
    {
      typename _Pair::first_type&
      operator()(_Pair& __x) const
      { return __x.first; }

      const typename _Pair::first_type&
      operator()(const _Pair& __x) const
      { return __x.first; }
    };

  template <class _Pair>
    struct _Select2nd : public unary_function<_Pair,
					      typename _Pair::second_type>
    {
      typename _Pair::second_type&
      operator()(_Pair& __x) const
      { return __x.second; }

      const typename _Pair::second_type&
      operator()(const _Pair& __x) const
      { return __x.second; }
    };

  // 20.3.8 adaptors pointers members
  /** @defgroup s20_3_8_memadaptors Adaptors for pointers to members
   *  There are a total of 16 = 2^4 function objects in this family.
   *   (1) Member functions taking no arguments vs member functions taking
   *        one argument.
   *   (2) Call through pointer vs call through reference.
   *   (3) Member function with void return type vs member function with
   *       non-void return type.
   *   (4) Const vs non-const member function.
   *
   *  Note that choice (3) is nothing more than a workaround: according
   *   to the draft, compilers should handle void and non-void the same way.
   *   This feature is not yet widely implemented, though.  You can only use
   *   member functions returning void if your compiler supports partial
   *   specialization.
   *
   *  All of this complexity is in the function objects themselves.  You can
   *   ignore it by using the helper function mem_fun and mem_fun_ref,
   *   which create whichever type of adaptor is appropriate.
   *
   *  @{
   */
  /// One of the @link s20_3_8_memadaptors adaptors for member pointers@endlink.
  template <class _Ret, class _Tp>
    class mem_fun_t : public unary_function<_Tp*, _Ret>
    {
    public:
      explicit
      mem_fun_t(_Ret (_Tp::*__pf)())
      : _M_f(__pf) {}

      _Ret
      operator()(_Tp* __p) const
      { return (__p->*_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_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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