functional_iterate.h

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inline
_Bind_result<_Result,
             typename _Maybe_wrap_member_pointer<_Functor>::type
               (_GLIBCXX_TEMPLATE_ARGS)>
bind(_Functor __f _GLIBCXX_COMMA _GLIBCXX_PARAMS)
{
  typedef _Maybe_wrap_member_pointer<_Functor> __maybe_type;
  typedef typename __maybe_type::type __functor_type;
  typedef _Bind_result<_Result, __functor_type(_GLIBCXX_TEMPLATE_ARGS)>
    __result_type;
  return __result_type(__maybe_type::__do_wrap(__f)
                       _GLIBCXX_COMMA _GLIBCXX_ARGS);
}

template<typename _Res, typename _Functor _GLIBCXX_COMMA
         _GLIBCXX_TEMPLATE_PARAMS>
class _Function_handler<_Res(_GLIBCXX_TEMPLATE_ARGS), _Functor>
  : public _Function_base::_Base_manager<_Functor>
{
  typedef _Function_base::_Base_manager<_Functor> _Base;

 public:
  static _Res
  _M_invoke(const _Any_data& __functor _GLIBCXX_COMMA _GLIBCXX_PARAMS)
  {
    return (*_Base::_M_get_pointer(__functor))(_GLIBCXX_ARGS);
  }
};

template<typename _Functor _GLIBCXX_COMMA _GLIBCXX_TEMPLATE_PARAMS>
class _Function_handler<void(_GLIBCXX_TEMPLATE_ARGS), _Functor>
  : public _Function_base::_Base_manager<_Functor>
{
  typedef _Function_base::_Base_manager<_Functor> _Base;

 public:
  static void
  _M_invoke(const _Any_data& __functor _GLIBCXX_COMMA _GLIBCXX_PARAMS)
  {
    (*_Base::_M_get_pointer(__functor))(_GLIBCXX_ARGS);
  }
};

template<typename _Res, typename _Functor _GLIBCXX_COMMA
         _GLIBCXX_TEMPLATE_PARAMS>
class _Function_handler<_Res(_GLIBCXX_TEMPLATE_ARGS),
                        reference_wrapper<_Functor> >
  : public _Function_base::_Ref_manager<_Functor>
{
  typedef _Function_base::_Ref_manager<_Functor> _Base;

 public:
  static _Res
  _M_invoke(const _Any_data& __functor _GLIBCXX_COMMA _GLIBCXX_PARAMS)
  {
    return __callable_functor(**_Base::_M_get_pointer(__functor))
             (_GLIBCXX_ARGS);
  }
};

template<typename _Functor _GLIBCXX_COMMA _GLIBCXX_TEMPLATE_PARAMS>
class _Function_handler<void(_GLIBCXX_TEMPLATE_ARGS),
                        reference_wrapper<_Functor> >
  : public _Function_base::_Ref_manager<_Functor>
{
  typedef _Function_base::_Ref_manager<_Functor> _Base;

 public:
  static void
  _M_invoke(const _Any_data& __functor _GLIBCXX_COMMA _GLIBCXX_PARAMS)
  {
    __callable_functor(**_Base::_M_get_pointer(__functor))(_GLIBCXX_ARGS);
  }
};

template<typename _Class, typename _Member, typename _Res
         _GLIBCXX_COMMA _GLIBCXX_TEMPLATE_PARAMS>
class _Function_handler<_Res(_GLIBCXX_TEMPLATE_ARGS), _Member _Class::*>
  : public _Function_handler<void(_GLIBCXX_TEMPLATE_ARGS), _Member _Class::*>
{
  typedef _Function_handler<void(_GLIBCXX_TEMPLATE_ARGS), _Member _Class::*>
    _Base;

 public:
  static _Res
  _M_invoke(const _Any_data& __functor _GLIBCXX_COMMA _GLIBCXX_PARAMS)
  {
    return std::tr1::mem_fn(_Base::_M_get_pointer(__functor)->__value)
             (_GLIBCXX_ARGS);
  }
};

template<typename _Class, typename _Member
         _GLIBCXX_COMMA _GLIBCXX_TEMPLATE_PARAMS>
class _Function_handler<void(_GLIBCXX_TEMPLATE_ARGS), _Member _Class::*>
  : public _Function_base::_Base_manager<
             _Simple_type_wrapper< _Member _Class::* > >
{
  typedef _Member _Class::* _Functor;
  typedef _Simple_type_wrapper< _Functor > _Wrapper;
  typedef _Function_base::_Base_manager<_Wrapper> _Base;

 public:
  static bool
  _M_manager(_Any_data& __dest, const _Any_data& __source,
             _Manager_operation __op)
  {
    switch (__op) {
    case __get_type_info:
      __dest._M_access<const type_info*>() = &typeid(_Functor);
      break;

    case __get_functor_ptr:
      __dest._M_access<_Functor*>() =
        &_Base::_M_get_pointer(__source)->__value;
      break;

    default:
      _Base::_M_manager(__dest, __source, __op);
    }
    return false;
  }

  static void
  _M_invoke(const _Any_data& __functor _GLIBCXX_COMMA _GLIBCXX_PARAMS)
  {
    std::tr1::mem_fn(_Base::_M_get_pointer(__functor)->__value)
      (_GLIBCXX_ARGS);
  }
};

template<typename _Res _GLIBCXX_COMMA _GLIBCXX_TEMPLATE_PARAMS>
class function<_Res(_GLIBCXX_TEMPLATE_ARGS)>
#if _GLIBCXX_NUM_ARGS == 1
  : public unary_function<_T1, _Res>, private _Function_base
#elif _GLIBCXX_NUM_ARGS == 2
  : public binary_function<_T1, _T2, _Res>, private _Function_base
#else
  : private _Function_base
#endif
{
  /**
   *  @if maint
   *  This class is used to implement the safe_bool idiom.
   *  @endif
   */
  struct _Hidden_type
  {
    _Hidden_type* _M_bool;
  };

  /**
   *  @if maint
   *  This typedef is used to implement the safe_bool idiom.
   *  @endif
   */
  typedef _Hidden_type* _Hidden_type::* _Safe_bool;

  typedef _Res _Signature_type(_GLIBCXX_TEMPLATE_ARGS);

  struct _Useless {};

 public:
  typedef _Res result_type;

  // [3.7.2.1] construct/copy/destroy

  /**
   *  @brief Default construct creates an empty function call wrapper.
   *  @post @c !(bool)*this
   */
  function() : _Function_base() { }

  /**
   *  @brief Default construct creates an empty function call wrapper.
   *  @post @c !(bool)*this
   */
  function(_M_clear_type*) : _Function_base() { }

  /**
   *  @brief %Function copy constructor.
   *  @param x A %function object with identical call signature.
   *  @pre @c (bool)*this == (bool)x
   *
   *  The newly-created %function contains a copy of the target of @a
   *  x (if it has one).
   */
  function(const function& __x);

  /**
   *  @brief Builds a %function that targets a copy of the incoming
   *  function object.
   *  @param f A %function object that is callable with parameters of
   *  type @c T1, @c T2, ..., @c TN and returns a value convertible
   *  to @c Res.
   *
   *  The newly-created %function object will target a copy of @a
   *  f. If @a f is @c reference_wrapper<F>, then this function
   *  object will contain a reference to the function object @c
   *  f.get(). If @a f is a NULL function pointer or NULL
   *  pointer-to-member, the newly-created object will be empty.
   *
   *  If @a f is a non-NULL function pointer or an object of type @c
   *  reference_wrapper<F>, this function will not throw.
   */
  template<typename _Functor>
    function(_Functor __f,
             typename __enable_if<_Useless,
                                  !is_integral<_Functor>::value>::__type
               = _Useless());

  /**
   *  @brief %Function assignment operator.
   *  @param x A %function with identical call signature.
   *  @post @c (bool)*this == (bool)x
   *  @returns @c *this
   *
   *  The target of @a x is copied to @c *this. If @a x has no
   *  target, then @c *this will be empty.
   *
   *  If @a x targets a function pointer or a reference to a function
   *  object, then this operation will not throw an exception.
   */
  function& operator=(const function& __x)
    {
      function(__x).swap(*this);
      return *this;
    }

  /**
   *  @brief %Function assignment to zero.
   *  @post @c !(bool)*this
   *  @returns @c *this
   *
   *  The target of @a *this is deallocated, leaving it empty.
   */
  function& operator=(_M_clear_type*)
    {
      if (_M_manager) {
        _M_manager(_M_functor, _M_functor, __destroy_functor);
        _M_manager = 0;
        _M_invoker = 0;
      }
      return *this;
    }

  /**
   *  @brief %Function assignment to a new target.
   *  @param f A %function object that is callable with parameters of
   *  type @c T1, @c T2, ..., @c TN and returns a value convertible
   *  to @c Res.
   *  @return @c *this
   *
   *  This  %function object wrapper will target a copy of @a
   *  f. If @a f is @c reference_wrapper<F>, then this function
   *  object will contain a reference to the function object @c
   *  f.get(). If @a f is a NULL function pointer or NULL
   *  pointer-to-member, @c this object will be empty.
   *
   *  If @a f is a non-NULL function pointer or an object of type @c
   *  reference_wrapper<F>, this function will not throw.
   */
  template<typename _Functor>
    typename __enable_if<function&, !is_integral<_Functor>::value>::__type
    operator=(_Functor __f)
    {
      function(__f).swap(*this);
      return *this;
    }

  // [3.7.2.2] function modifiers

  /**
   *  @brief Swap the targets of two %function objects.
   *  @param f A %function with identical call signature.
   *
   *  Swap the targets of @c this function object and @a f. This
   *  function will not throw an exception.
   */
  void swap(function& __x)
  {
    _Any_data __old_functor = _M_functor;
    _M_functor = __x._M_functor;
    __x._M_functor = __old_functor;
    _Manager_type __old_manager = _M_manager;
    _M_manager = __x._M_manager;
    __x._M_manager = __old_manager;
    _Invoker_type __old_invoker = _M_invoker;
    _M_invoker = __x._M_invoker;
    __x._M_invoker = __old_invoker;
  }

  // [3.7.2.3] function capacity

  /**
   *  @brief Determine if the %function wrapper has a target.
   *
   *  @return @c true when this %function object contains a target,
   *  or @c false when it is empty.
   *
   *  This function will not throw an exception.
   */
  operator _Safe_bool() const
    {
      if (_M_empty())
        {
          return 0;
        }
      else
        {
          return &_Hidden_type::_M_bool;
        }
    }

  // [3.7.2.4] function invocation

  /**
   *  @brief Invokes the function targeted by @c *this.
   *  @returns the result of the target.
   *  @throws bad_function_call when @c !(bool)*this
   *
   *  The function call operator invokes the target function object
   *  stored by @c this.
   */
  _Res operator()(_GLIBCXX_PARAMS) const;

  // [3.7.2.5] function target access
  /**
   *  @brief Determine the type of the target of this function object
   *  wrapper.
   *
   *  @returns the type identifier of the target function object, or
   *  @c typeid(void) if @c !(bool)*this.
   *
   *  This function will not throw an exception.
   */
  const type_info& target_type() const;

  /**
   *  @brief Access the stored target function object.
   *
   *  @return Returns a pointer to the stored target function object,
   *  if @c typeid(Functor).equals(target_type()); otherwise, a NULL
   *  pointer.
   *
   * This function will not throw an exception.
   */
  template<typename _Functor>       _Functor* target();

  /**
   *  @overload
   */
  template<typename _Functor> const _Functor* target() const;

 private:
  // [3.7.2.6] undefined operators
  template<typename _Function>
    void operator==(const function<_Function>&) const;
  template<typename _Function>
    void operator!=(const function<_Function>&) const;

  typedef _Res (*_Invoker_type)(const _Any_data& _GLIBCXX_COMMA
                                _GLIBCXX_PARAMS);
  _Invoker_type _M_invoker;
};

template<typename _Res _GLIBCXX_COMMA _GLIBCXX_TEMPLATE_PARAMS>
  function<_Res(_GLIBCXX_TEMPLATE_ARGS)>::function(const function& __x)
    : _Function_base()
  {
    if (__x) {
      _M_invoker = __x._M_invoker;
      _M_manager = __x._M_manager;
      __x._M_manager(_M_functor, __x._M_functor, __clone_functor);
    }
  }

template<typename _Res _GLIBCXX_COMMA _GLIBCXX_TEMPLATE_PARAMS>
template<typename _Functor>
  function<_Res(_GLIBCXX_TEMPLATE_ARGS)>
  ::function(_Functor __f,
             typename __enable_if<_Useless,
                                  !is_integral<_Functor>::value>::__type)
    : _Function_base()
{
  typedef _Function_handler<_Signature_type, _Functor> _My_handler;
  if (_My_handler::_M_not_empty_function(__f)) {
    _M_invoker = &_My_handler::_M_invoke;
    _M_manager = &_My_handler::_M_manager;
    _My_handler::_M_init_functor(_M_functor, __f);
  }
}

template<typename _Res _GLIBCXX_COMMA _GLIBCXX_TEMPLATE_PARAMS>
  _Res
  function<_Res(_GLIBCXX_TEMPLATE_ARGS)>::operator()(_GLIBCXX_PARAMS) const
  {
    if (_M_empty())
      {
#if __EXCEPTIONS
        throw bad_function_call();
#else
        std::abort();
#endif
      }
    return _M_invoker(_M_functor _GLIBCXX_COMMA _GLIBCXX_ARGS);
  }

template<typename _Res _GLIBCXX_COMMA _GLIBCXX_TEMPLATE_PARAMS>
  const type_info&
  function<_Res(_GLIBCXX_TEMPLATE_ARGS)>::target_type() const
  {
    if (_M_manager)
      {
        _Any_data __typeinfo_result;
        _M_manager(__typeinfo_result, _M_functor, __get_type_info);
        return *__typeinfo_result._M_access<const type_info*>();
      }
    else
      {
        return typeid(void);
      }
  }

template<typename _Res _GLIBCXX_COMMA _GLIBCXX_TEMPLATE_PARAMS>
template<typename _Functor>
  _Functor*
  function<_Res(_GLIBCXX_TEMPLATE_ARGS)>::target()
  {
    if (typeid(_Functor) == target_type() && _M_manager)
      {
        _Any_data __ptr;
        if (_M_manager(__ptr, _M_functor, __get_functor_ptr)
            && !is_const<_Functor>::value)
          return 0;
        else
          return __ptr._M_access<_Functor*>();
      }
    else
      {
        return 0;
      }
  }

template<typename _Res _GLIBCXX_COMMA _GLIBCXX_TEMPLATE_PARAMS>
template<typename _Functor>
  const _Functor*
  function<_Res(_GLIBCXX_TEMPLATE_ARGS)>::target() const
  {
    if (typeid(_Functor) == target_type() && _M_manager)
      {
        _Any_data __ptr;
        _M_manager(__ptr, _M_functor, __get_functor_ptr);
        return __ptr._M_access<const _Functor*>();
      }
    else
      {
        return 0;
      }
  }