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@ -9,7 +9,198 @@
<meta name="organization" content="Boost Consulting, Indiana University Open Systems Lab, University of Hanover Institute for Transport Railway Operation and Construction" />
<meta name="date" content="2003-09-14" />
<meta name="copyright" content="Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2003. All rights reserved" />
<link rel="stylesheet" href="../../../rst.css" type="text/css" />
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<body>
<div class="document" id="iterator-adaptor">
@ -40,8 +231,12 @@ Railway Operation and Construction</a></td></tr>
</tr>
</tbody>
</table>
<p>The <tt class="literal"><span class="pre">iterator_adaptor</span></tt> is a base class template derived from an
instantiation of <tt class="literal"><span class="pre">iterator_facade</span></tt>. The core interface functions
<!-- Version 1.1 of this ReStructuredText document corresponds to
n1530_, the paper accepted by the LWG. -->
<!-- Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2003. All
rights reserved -->
<p>Each specialization of the <tt class="literal"><span class="pre">iterator_adaptor</span></tt> class template is derived from
a specialization of <tt class="literal"><span class="pre">iterator_facade</span></tt>. The core interface functions
expected by <tt class="literal"><span class="pre">iterator_facade</span></tt> are implemented in terms of the
<tt class="literal"><span class="pre">iterator_adaptor</span></tt>'s <tt class="literal"><span class="pre">Base</span></tt> template parameter. A class derived
from <tt class="literal"><span class="pre">iterator_adaptor</span></tt> typically redefines some of the core
@ -55,16 +250,21 @@ core interface functions of <tt class="literal"><span class="pre">iterator_facad
<ul class="simple">
<li><a class="reference" href="#introduction" id="id3" name="id3">Introduction</a></li>
<li><a class="reference" href="#reference" id="id4" name="id4">Reference</a><ul>
<li><a class="reference" href="#iterator-adaptor-requirements" id="id5" name="id5"><tt class="literal"><span class="pre">iterator_adaptor</span></tt> requirements</a></li>
<li><a class="reference" href="#iterator-adaptor-public-operations" id="id6" name="id6"><tt class="literal"><span class="pre">iterator_adaptor</span></tt> public operations</a></li>
<li><a class="reference" href="#iterator-adaptor-protected-member-functions" id="id7" name="id7"><tt class="literal"><span class="pre">iterator_adaptor</span></tt> protected member functions</a></li>
<li><a class="reference" href="#iterator-adaptor-private-member-functions" id="id8" name="id8"><tt class="literal"><span class="pre">iterator_adaptor</span></tt> private member functions</a></li>
<li><a class="reference" href="#iterator-adaptor-base-class-parameters" id="id5" name="id5"><tt class="literal"><span class="pre">iterator_adaptor</span></tt> base class parameters</a></li>
<li><a class="reference" href="#iterator-adaptor-usage" id="id6" name="id6"><tt class="literal"><span class="pre">iterator_adaptor</span></tt> usage</a></li>
<li><a class="reference" href="#iterator-adaptor-public-operations" id="id7" name="id7"><tt class="literal"><span class="pre">iterator_adaptor</span></tt> public operations</a></li>
<li><a class="reference" href="#iterator-adaptor-protected-member-functions" id="id8" name="id8"><tt class="literal"><span class="pre">iterator_adaptor</span></tt> protected member functions</a></li>
<li><a class="reference" href="#iterator-adaptor-private-member-functions" id="id9" name="id9"><tt class="literal"><span class="pre">iterator_adaptor</span></tt> private member functions</a></li>
</ul>
</li>
</ul>
</div>
<div class="section" id="introduction">
<h1><a class="toc-backref" href="#id3" name="introduction">Introduction</a></h1>
<!-- Version 1.2 of this ReStructuredText document corresponds to
n1530_, the paper accepted by the LWG for TR1. -->
<!-- Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2003. All
rights reserved -->
<p>The <tt class="literal"><span class="pre">iterator_adaptor</span></tt> class template adapts some <tt class="literal"><span class="pre">Base</span></tt> <a class="footnote-reference" href="#base" id="id1" name="id1"><sup>1</sup></a>
type to create a new iterator. Instantiations of <tt class="literal"><span class="pre">iterator_adaptor</span></tt>
are derived from a corresponding instantiation of <tt class="literal"><span class="pre">iterator_facade</span></tt>
@ -87,31 +287,36 @@ above. The <tt class="literal"><span class="pre">Base</span></tt> type need not
iterator. It need only support the operations used by the core
interface functions of <tt class="literal"><span class="pre">iterator_adaptor</span></tt> that have not been
redefined in the user's derived class.</p>
<p>Several of the template parameters of <tt class="literal"><span class="pre">iterator_adaptor</span></tt> default to
<tt class="literal"><span class="pre">use_default</span></tt>. This allows the user to make use of a default
parameter even when the user wants to specify a parameter later in the
parameter list. Also, the defaults for the corresponding associated
types are fairly complicated, so metaprogramming is required to
compute them, and <tt class="literal"><span class="pre">use_default</span></tt> can help to simplify the
implementation. Finally, <tt class="literal"><span class="pre">use_default</span></tt> is not left unspecified
<p>Several of the template parameters of <tt class="literal"><span class="pre">iterator_adaptor</span></tt> default
to <tt class="literal"><span class="pre">use_default</span></tt>. This allows the
user to make use of a default parameter even when she wants to
specify a parameter later in the parameter list. Also, the
defaults for the corresponding associated types are somewhat
complicated, so metaprogramming is required to compute them, and
<tt class="literal"><span class="pre">use_default</span></tt> can help to simplify the implementation. Finally,
the identity of the <tt class="literal"><span class="pre">use_default</span></tt> type is not left unspecified
because specification helps to highlight that the <tt class="literal"><span class="pre">Reference</span></tt>
template parameter may not always be identical to the iterator's
<tt class="literal"><span class="pre">reference</span></tt> type, and will keep users making mistakes based on that
assumption.</p>
<tt class="literal"><span class="pre">reference</span></tt> type, and will keep users from making mistakes based on
that assumption.</p>
</div>
<div class="section" id="reference">
<h1><a class="toc-backref" href="#id4" name="reference">Reference</a></h1>
<!-- 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. All
rights reserved. -->
<pre class="literal-block">
template &lt;
class Derived
, class Base
, class Value = use_default
, class Category = use_default
, class Value = use_default
, class CategoryOrTraversal = use_default
, class Reference = use_default
, class Difference = use_default
&gt;
class iterator_adaptor
: public iterator_facade&lt;Derived, /* see <a class="reference" href=":">details</a> ...*/&gt;
: public iterator_facade&lt;Derived, <em>V</em>, <em>C</em>, <em>R</em>, <em>D</em>&gt; // see <a class="reference" href=":">details</a>
{
friend class iterator_core_access;
public:
@ -140,68 +345,53 @@ class iterator_adaptor
iterator_adaptor&lt;OtherDerived, OtherIterator, V, C, R, D&gt; const&amp; y) const;
private:
Base m_iterator;
Base m_iterator; // exposition only
};
</pre>
<div class="section" id="iterator-adaptor-requirements">
<h2><a class="toc-backref" href="#id5" name="iterator-adaptor-requirements"><tt class="literal"><span class="pre">iterator_adaptor</span></tt> requirements</a></h2>
<p>The <tt class="literal"><span class="pre">Derived</span></tt> template parameter must be a derived class of
<tt class="literal"><span class="pre">iterator_adaptor</span></tt>. The <tt class="literal"><span class="pre">Base</span></tt> type must implement the
expressions involving <tt class="literal"><span class="pre">m_iterator</span></tt> in the specifications of those
private member functions of <tt class="literal"><span class="pre">iterator_adaptor</span></tt> that are not
redefined by the <tt class="literal"><span class="pre">Derived</span></tt> class and that are needed to model the
concept corresponding to the <tt class="literal"><span class="pre">iterator_adaptor</span></tt>'s <tt class="literal"><span class="pre">category</span></tt>
typedef according to the requirements of <tt class="literal"><span class="pre">iterator_facade</span></tt>. The
rest of the template parameters specify the types for the member
typedefs in <tt class="literal"><span class="pre">iterator_facade</span></tt>. The following pseudo-code
specifies the traits types for <tt class="literal"><span class="pre">iterator_adaptor</span></tt>.</p>
<div class="section" id="iterator-adaptor-base-class-parameters">
<h2><a class="toc-backref" href="#id5" name="iterator-adaptor-base-class-parameters"><tt class="literal"><span class="pre">iterator_adaptor</span></tt> base class parameters</a></h2>
<p>The <em>V</em>, <em>C</em>, <em>R</em>, and <em>D</em> parameters of the <tt class="literal"><span class="pre">iterator_facade</span></tt>
used as a base class in the summary of <tt class="literal"><span class="pre">iterator_adaptor</span></tt>
above are defined as follows:</p>
<pre class="literal-block">
if (Value == use_default)
value_type = iterator_traits&lt;Base&gt;::value_type;
else
value_type = remove_cv&lt;Value&gt;::type;
<em>V</em> = if (Value is use_default)
return iterator_traits&lt;Base&gt;::value_type
else
return Value
if (Reference == use_default) {
if (Value == use_default)
reference = iterator_traits&lt;Base&gt;::reference;
else
reference = Value&amp;;
} else
reference = Reference;
<em>C</em> = if (CategoryOrTraversal is use_default)
return iterator_traversal&lt;Base&gt;::type
else
return CategoryOrTraversal
if (Distance == use_default)
difference_type = iterator_traits&lt;Base&gt;::difference_type;
else
difference_type = Distance;
<em>R</em> = if (Reference is use_default)
if (Value is use_default)
return iterator_traits&lt;Base&gt;::reference
else
return Value&amp;
else
return Reference
if (Category == use_default)
iterator_category = iterator_tag&lt;
access_category&lt; Base &gt;,
traversal_category&lt; Base &gt;
&gt;
else if (Category is an access tag)
iterator_category = iterator_tag&lt;
Category
...
else if (Category is a traversal tag)
...
else
iterator_category = Category;
// Actually the above is wrong. See the use of
// access_category_tag and
// new_category_to_access/iter_category_to_access.
<em>D</em> = if (Difference is use_default)
return iterator_traits&lt;Base&gt;::difference_type
else
return Difference
</pre>
<!-- Replaced with new semantics - -thw
if (Category == use_default)
iterator_category = iterator_traits<Base>::iterator_category;
else
iterator_category = Category;
Fix this up!! -->
</div>
<div class="section" id="iterator-adaptor-usage">
<h2><a class="toc-backref" href="#id6" name="iterator-adaptor-usage"><tt class="literal"><span class="pre">iterator_adaptor</span></tt> usage</a></h2>
<p>The <tt class="literal"><span class="pre">Derived</span></tt> template parameter must be a publicly derived from
<tt class="literal"><span class="pre">iterator_adaptor</span></tt>. In order for <tt class="literal"><span class="pre">Derived</span></tt> to model the
iterator concepts corresponding to
<tt class="literal"><span class="pre">iterator_traits&lt;Derived&gt;::iterator_category</span></tt>, the expressions
involving <tt class="literal"><span class="pre">m_iterator</span></tt> in the specifications of those private
member functions of <tt class="literal"><span class="pre">iterator_adaptor</span></tt> that may be called by
<tt class="literal"><span class="pre">iterator_facade&lt;Derived,</span> <span class="pre">``\</span> <span class="pre">*V*\</span></tt>, <tt class="literal"><span class="pre">\</span> <span class="pre">*C*\</span></tt>, <tt class="literal"><span class="pre">\</span> <span class="pre">*R*\</span></tt>, <tt class="literal"><span class="pre">\</span>
<span class="pre">*D*\</span></tt>&gt;`` in evaluating any valid expression involving <tt class="literal"><span class="pre">Derived</span></tt>
in those concepts' requirements.</p>
</div>
<div class="section" id="iterator-adaptor-public-operations">
<h2><a class="toc-backref" href="#id6" name="iterator-adaptor-public-operations"><tt class="literal"><span class="pre">iterator_adaptor</span></tt> public operations</a></h2>
<h2><a class="toc-backref" href="#id7" name="iterator-adaptor-public-operations"><tt class="literal"><span class="pre">iterator_adaptor</span></tt> public operations</a></h2>
<p><tt class="literal"><span class="pre">iterator_adaptor();</span></tt></p>
<table class="field-list" frame="void" rules="none">
<col class="field-name" />
@ -235,7 +425,7 @@ Fix this up!! -->
</table>
</div>
<div class="section" id="iterator-adaptor-protected-member-functions">
<h2><a class="toc-backref" href="#id7" name="iterator-adaptor-protected-member-functions"><tt class="literal"><span class="pre">iterator_adaptor</span></tt> protected member functions</a></h2>
<h2><a class="toc-backref" href="#id8" name="iterator-adaptor-protected-member-functions"><tt class="literal"><span class="pre">iterator_adaptor</span></tt> protected member functions</a></h2>
<p><tt class="literal"><span class="pre">Base</span> <span class="pre">const&amp;</span> <span class="pre">base_reference()</span> <span class="pre">const;</span></tt></p>
<table class="field-list" frame="void" rules="none">
<col class="field-name" />
@ -256,7 +446,7 @@ Fix this up!! -->
</table>
</div>
<div class="section" id="iterator-adaptor-private-member-functions">
<h2><a class="toc-backref" href="#id8" name="iterator-adaptor-private-member-functions"><tt class="literal"><span class="pre">iterator_adaptor</span></tt> private member functions</a></h2>
<h2><a class="toc-backref" href="#id9" name="iterator-adaptor-private-member-functions"><tt class="literal"><span class="pre">iterator_adaptor</span></tt> private member functions</a></h2>
<p><tt class="literal"><span class="pre">typename</span> <span class="pre">iterator_adaptor::reference</span> <span class="pre">dereference()</span> <span class="pre">const;</span></tt></p>
<table class="field-list" frame="void" rules="none">
<col class="field-name" />
@ -328,7 +518,7 @@ typename iterator_adaptor::difference_type distance_to(
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