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.. Version 1.4 of this ReStructuredText document corresponds to
n1530_, the paper accepted by the LWG for TR1.
.. Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2003.
.. parsed-literal::
template <
class Derived
, class Base
, class Value = use_default
, class CategoryOrTraversal = use_default
, class Reference = use_default
, class Difference = use_default
>
class iterator_adaptor
: public iterator_facade<Derived, *V'*, *C'*, *R'*, *D'*> // see details__
{
friend class iterator_core_access;
public:
iterator_adaptor();
explicit iterator_adaptor(Base iter);
Base const& base() const;
protected:
typedef iterator_adaptor iterator_adaptor\_;
Base const& base_reference() const;
Base& base_reference();
private: // Core iterator interface for iterator_facade.
typename iterator_adaptor::reference dereference() const;
template <
class OtherDerived, class OtherIterator, class V, class C, class R, class D
>
bool equal(iterator_adaptor<OtherDerived, OtherIterator, V, C, R, D> const& x) const;
void advance(typename iterator_adaptor::difference_type n);
void increment();
void decrement();
template <
class OtherDerived, class OtherIterator, class V, class C, class R, class D
>
typename iterator_adaptor::difference_type distance_to(
iterator_adaptor<OtherDerived, OtherIterator, V, C, R, D> const& y) const;
private:
Base m_iterator; // exposition only
};
__ base_parameters_
.. _requirements:
``iterator_adaptor`` requirements
---------------------------------
``static_cast<Derived*>(iterator_adaptor*)`` shall be well-formed.
The ``Base`` argument shall be Assignable and Copy Constructible.
.. _base_parameters:
``iterator_adaptor`` base class parameters
------------------------------------------
The *V'*, *C'*, *R'*, and *D'* parameters of the ``iterator_facade``
used as a base class in the summary of ``iterator_adaptor``
above are defined as follows:
.. parsed-literal::
*V'* = if (Value is use_default)
return iterator_traits<Base>::value_type
else
return Value
*C'* = if (CategoryOrTraversal is use_default)
return iterator_traversal<Base>::type
else
return CategoryOrTraversal
*R'* = if (Reference is use_default)
if (Value is use_default)
return iterator_traits<Base>::reference
else
return Value&
else
return Reference
*D'* = if (Difference is use_default)
return iterator_traits<Base>::difference_type
else
return Difference
.. ``iterator_adaptor`` models
---------------------------
In order for ``Derived`` to model the iterator concepts corresponding
to ``iterator_traits<Derived>::iterator_category``, the expressions
involving ``m_iterator`` in the specifications of those private member
functions of ``iterator_adaptor`` that may be called by
``iterator_facade<Derived, V, C, R, D>`` in evaluating any valid
expression involving ``Derived`` in those concepts' requirements.
.. The above is confusing and needs a rewrite. -JGS
.. That's why it's removed. We're embracing inheritance, remember?
``iterator_adaptor`` public operations
--------------------------------------
``iterator_adaptor();``
:Requires: The ``Base`` type must be Default Constructible.
:Returns: An instance of ``iterator_adaptor`` with
``m_iterator`` default constructed.
``explicit iterator_adaptor(Base iter);``
:Returns: An instance of ``iterator_adaptor`` with
``m_iterator`` copy constructed from ``iter``.
``Base const& base() const;``
:Returns: ``m_iterator``
``iterator_adaptor`` protected member functions
-----------------------------------------------
``Base const& base_reference() const;``
:Returns: A const reference to ``m_iterator``.
``Base& base_reference();``
:Returns: A non-const reference to ``m_iterator``.
``iterator_adaptor`` private member functions
---------------------------------------------
``typename iterator_adaptor::reference dereference() const;``
:Returns: ``*m_iterator``
::
template <
class OtherDerived, class OtherIterator, class V, class C, class R, class D
>
bool equal(iterator_adaptor<OtherDerived, OtherIterator, V, C, R, D> const& x) const;
:Returns: ``m_iterator == x.base()``
``void advance(typename iterator_adaptor::difference_type n);``
:Effects: ``m_iterator += n;``
``void increment();``
:Effects: ``++m_iterator;``
``void decrement();``
:Effects: ``--m_iterator;``
::
template <
class OtherDerived, class OtherIterator, class V, class C, class R, class D
>
typename iterator_adaptor::difference_type distance_to(
iterator_adaptor<OtherDerived, OtherIterator, V, C, R, D> const& y) const;
:Returns: ``y.base() - m_iterator``
|
