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more work on the specification of iterator_category

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[SVN r21662]
This commit is contained in:
Jeremy Siek
2004-01-13 05:56:29 +00:00
parent 2edb688882
commit ec8d069057
9 changed files with 157 additions and 49 deletions
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25
doc/indirect_iterator_ref.rst
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@ -57,7 +57,7 @@ following pseudo-code. We use the abbreviation
typedef Reference reference;
if (Value is use_default) then
typedef ?? pointer;
typedef iterator_traits<V>::value_type* pointer;
else
typedef Value* pointer;
@ -67,9 +67,24 @@ following pseudo-code. We use the abbreviation
typedef Difference difference_type;
The member ``iterator_category`` is a type that satisfies the
requirements of the concepts modeled by the ``indirect_iterator`` as
specified in the models section.
If ``CategoryOrTraversal`` is not ``use_default`` then
``iterator_category`` is ``CategoryOrTraversal``. Otherwise
``iterator_category`` is a type convertible to the tag determined by
the following algorithm. Let ``C`` be ``traveral_category<Iterator>::type``.
::
if (reference is a reference to value_type) then
if (C is convertible to random_access_traversal_tag) then
random_access_iterator_tag
else if (C is convertible to bidirectional_traversal_tag) then
bidirectional_iterator_tag
else
forward_iterator_tag
else
input_iterator_tag
``indirect_iterator`` requirements
@ -79,7 +94,7 @@ The ``Iterator`` argument shall meet the requirements of Readable
Iterator. The ``CategoryOrTraversal`` argument shall be one of the
standard iterator tags or ``use_default``. If ``CategoryOrTraversal``
is an iterator tag, the template parameter ``Iterator`` argument shall
meet the traversal requirements corresponding to the iterator tag.
meet the requirements corresponding to the iterator tag.
The expression ``*v``, where ``v`` is an object of type
``iterator_traits<Iterator>::value_type``, must be a valid expression