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added make_xxx functions for some of the iterators

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[SVN r21611]
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Jeremy Siek
2004-01-12 01:30:47 +00:00
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@ -3,203 +3,12 @@
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<title>Iterator Facade and Adaptor</title>
<meta name="author" content="David Abrahams, Jeremy Siek, Thomas Witt" />
<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="2003-11-24" />
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<div class="document" id="iterator-facade-and-adaptor">
@ -308,20 +117,21 @@ by adapting other iterators.</td>
</ul>
</li>
<li><a class="reference" href="#filter-iterator-requirements" id="id55" name="id55"><tt class="literal"><span class="pre">filter_iterator</span></tt> requirements</a></li>
<li><a class="reference" href="#filter-iterator-operations" id="id56" name="id56"><tt class="literal"><span class="pre">filter_iterator</span></tt> operations</a></li>
<li><a class="reference" href="#counting-iterator" id="id57" name="id57">Counting iterator</a><ul>
<li><a class="reference" href="#class-template-counting-iterator" id="id58" name="id58">Class template <tt class="literal"><span class="pre">counting_iterator</span></tt></a></li>
<li><a class="reference" href="#filter-iterator-models" id="id56" name="id56"><tt class="literal"><span class="pre">filter_iterator</span></tt> models</a></li>
<li><a class="reference" href="#filter-iterator-operations" id="id57" name="id57"><tt class="literal"><span class="pre">filter_iterator</span></tt> operations</a></li>
<li><a class="reference" href="#counting-iterator" id="id58" name="id58">Counting iterator</a><ul>
<li><a class="reference" href="#class-template-counting-iterator" id="id59" name="id59">Class template <tt class="literal"><span class="pre">counting_iterator</span></tt></a></li>
</ul>
</li>
<li><a class="reference" href="#counting-iterator-requirements" id="id59" name="id59"><tt class="literal"><span class="pre">counting_iterator</span></tt> requirements</a></li>
<li><a class="reference" href="#counting-iterator-operations" id="id60" name="id60"><tt class="literal"><span class="pre">counting_iterator</span></tt> operations</a></li>
<li><a class="reference" href="#function-output-iterator" id="id61" name="id61">Function output iterator</a><ul>
<li><a class="reference" href="#class-template-function-output-iterator" id="id62" name="id62">Class template <tt class="literal"><span class="pre">function_output_iterator</span></tt></a></li>
<li><a class="reference" href="#counting-iterator-requirements" id="id60" name="id60"><tt class="literal"><span class="pre">counting_iterator</span></tt> requirements</a></li>
<li><a class="reference" href="#counting-iterator-operations" id="id61" name="id61"><tt class="literal"><span class="pre">counting_iterator</span></tt> operations</a></li>
<li><a class="reference" href="#function-output-iterator" id="id62" name="id62">Function output iterator</a><ul>
<li><a class="reference" href="#class-template-function-output-iterator" id="id63" name="id63">Class template <tt class="literal"><span class="pre">function_output_iterator</span></tt></a></li>
</ul>
</li>
<li><a class="reference" href="#function-output-iterator-requirements" id="id63" name="id63"><tt class="literal"><span class="pre">function_output_iterator</span></tt> requirements</a></li>
<li><a class="reference" href="#function-output-iterator-operations" id="id64" name="id64"><tt class="literal"><span class="pre">function_output_iterator</span></tt> operations</a></li>
<li><a class="reference" href="#function-output-iterator-output-proxy-operations" id="id65" name="id65"><tt class="literal"><span class="pre">function_output_iterator::output_proxy</span></tt> operations</a></li>
<li><a class="reference" href="#function-output-iterator-requirements" id="id64" name="id64"><tt class="literal"><span class="pre">function_output_iterator</span></tt> requirements</a></li>
<li><a class="reference" href="#function-output-iterator-operations" id="id65" name="id65"><tt class="literal"><span class="pre">function_output_iterator</span></tt> operations</a></li>
<li><a class="reference" href="#function-output-iterator-output-proxy-operations" id="id66" name="id66"><tt class="literal"><span class="pre">function_output_iterator::output_proxy</span></tt> operations</a></li>
</ul>
</li>
</ul>
@ -604,14 +414,16 @@ into the temporary iterator <tt class="literal"><span class="pre">p+n</span></tt
<tt class="literal"><span class="pre">operator[]</span></tt> returns.</p>
<p>Writable iterators built with <tt class="literal"><span class="pre">iterator_facade</span></tt> implement the
semantics required by the preferred resolution to <a class="reference" href="http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/lwg-active.html#299">issue 299</a> and
adopted by proposal <a class="reference" href="http://anubis.dkuug.dk/JTC1/SC22/WG21/docs/papers/2003/n1550.html">n1550</a>: the result of <tt class="literal"><span class="pre">p[n]</span></tt> is a proxy object
containing a copy of <tt class="literal"><span class="pre">p+n</span></tt>, and <tt class="literal"><span class="pre">p[n]</span> <span class="pre">=</span> <span class="pre">x</span></tt> is equivalent to <tt class="literal"><span class="pre">*(p</span>
<span class="pre">+</span> <span class="pre">n)</span> <span class="pre">=</span> <span class="pre">x</span></tt>. This approach will work properly for any random-access
iterator regardless of the other details of its implementation. A
user who knows more about the implementation of her iterator is free
to implement an <tt class="literal"><span class="pre">operator[]</span></tt> which returns an lvalue in the derived
iterator class; it will hide the one supplied by <tt class="literal"><span class="pre">iterator_facade</span></tt>
from clients of her iterator.</p>
adopted by proposal <a class="reference" href="http://anubis.dkuug.dk/JTC1/SC22/WG21/docs/papers/2003/n1550.html">n1550</a>: the result of <tt class="literal"><span class="pre">p[n]</span></tt> is an object
convertible to the iterator's <tt class="literal"><span class="pre">value_type</span></tt>, and <tt class="literal"><span class="pre">p[n]</span> <span class="pre">=</span> <span class="pre">x</span></tt> is
equivalent to <tt class="literal"><span class="pre">*(p</span> <span class="pre">+</span> <span class="pre">n)</span> <span class="pre">=</span> <span class="pre">x</span></tt> (Note: This result object may be
implemented as a proxy containing a copy of <tt class="literal"><span class="pre">p+n</span></tt>). This approach
will work properly for any random-access iterator regardless of the
other details of its implementation. A user who knows more about
the implementation of her iterator is free to implement an
<tt class="literal"><span class="pre">operator[]</span></tt> that returns an lvalue in the derived iterator
class; it will hide the one supplied by <tt class="literal"><span class="pre">iterator_facade</span></tt> from
clients of her iterator.</p>
<a class="target" id="operator-arrow" name="operator-arrow"></a></div>
<div class="section" id="id6">
<h3><a class="toc-backref" href="#id22" name="id6"><tt class="literal"><span class="pre">operator-&gt;</span></tt></a></h3>
@ -1066,10 +878,13 @@ of type <tt class="literal"><span class="pre">pointer</span></tt> equal to:</p>
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field"><th class="field-name">Returns:</th><td class="field-body">an object convertible to <tt class="literal"><span class="pre">reference</span></tt> and holding a copy
<em>p</em> of <tt class="literal"><span class="pre">*static_cast&lt;Derived</span> <span class="pre">const*&gt;(this)</span> <span class="pre">+</span> <span class="pre">n</span></tt> such that, for a constant object <tt class="literal"><span class="pre">v</span></tt> of type
<tt class="literal"><span class="pre">value_type</span></tt>, <tt class="literal"><span class="pre">(*static_cast&lt;Derived</span> <span class="pre">const*&gt;(this))[n]</span> <span class="pre">=</span> <span class="pre">v</span></tt> is equivalent
to <tt class="literal"><span class="pre">p</span> <span class="pre">=</span> <span class="pre">v</span></tt>.</td>
<tr class="field"><th class="field-name">Returns:</th><td class="field-body">an object convertible to <tt class="literal"><span class="pre">value_type</span></tt>. For constant
objects <tt class="literal"><span class="pre">v</span></tt> of type <tt class="literal"><span class="pre">value_type</span></tt>, and <tt class="literal"><span class="pre">n</span></tt> of type
<tt class="literal"><span class="pre">difference_type</span></tt>, and reference <tt class="literal"><span class="pre">p</span></tt> equal to
<tt class="literal"><span class="pre">*static_cast&lt;Derived</span> <span class="pre">const*&gt;(this)</span></tt>, <tt class="literal"><span class="pre">(*this)[n]</span> <span class="pre">=</span> <span class="pre">v</span></tt> is
equivalent to <tt class="literal"><span class="pre">*(p+</span> <span class="pre">n)</span> <span class="pre">=</span> <span class="pre">v</span></tt>, and <tt class="literal"><span class="pre">static_cast&lt;value_type</span>
<span class="pre">const&amp;&gt;((*this)[n])</span></tt> is equivalent to
<tt class="literal"><span class="pre">static_cast&lt;value_type</span> <span class="pre">const&amp;&gt;(*(p+n))</span></tt></td>
</tr>
</tbody>
</table>
@ -1814,13 +1629,14 @@ iterator and the end of the range.</p>
<pre class="literal-block">
template &lt;class Predicate, class Iterator&gt;
class filter_iterator
: public iterator_adaptor&lt;
filter_iterator&lt;Predicate, Iterator&gt;, Iterator
, use_default
, /* see details */
&gt;
{
public:
typedef iterator_traits&lt;Iterator&gt;::value_type value_type;
typedef iterator_traits&lt;Iterator&gt;::reference reference;
typedef iterator_traits&lt;Iterator&gt;::pointer pointer;
typedef iterator_traits&lt;Iterator&gt;::difference_type difference_type;
typedef /* see below */ iterator_category;
filter_iterator();
filter_iterator(Predicate f, Iterator x, Iterator end = Iterator());
filter_iterator(Iterator x, Iterator end = Iterator());
@ -1831,45 +1647,122 @@ class filter_iterator
);
Predicate predicate() const;
Iterator end() const;
private: // as-if specification
void increment()
{
++(this-&gt;base_reference());
satisfy_predicate();
}
void satisfy_predicate()
{
while (this-&gt;base() != this-&gt;m_end &amp;&amp; !this-&gt;m_predicate(*this-&gt;base()))
++(this-&gt;base_reference());
}
Predicate m_predicate;
Iterator m_end;
};
</pre>
<p>The <tt class="literal"><span class="pre">iterator_category</span></tt> is a type convertible to the tags
corresponding to each standard concept modeled by <tt class="literal"><span class="pre">filter_iterator</span></tt>,
as described in the models section.</p>
</div>
</div>
<div class="section" id="filter-iterator-requirements">
<h3><a class="toc-backref" href="#id55" name="filter-iterator-requirements"><tt class="literal"><span class="pre">filter_iterator</span></tt> requirements</a></h3>
<p>The base <tt class="literal"><span class="pre">Iterator</span></tt> parameter must be a model of Readable
Iterator and Single Pass Iterator. The resulting
<tt class="literal"><span class="pre">filter_iterator</span></tt> will be a model of Forward Traversal Iterator
if <tt class="literal"><span class="pre">Iterator</span></tt> is, otherwise the <tt class="literal"><span class="pre">filter_iterator</span></tt> will be a
model of Single Pass Iterator. The access category of the
<tt class="literal"><span class="pre">filter_iterator</span></tt> will be the same as the access category of
<tt class="literal"><span class="pre">Iterator</span></tt>.</p>
<!-- Thomas is going to try implementing filter_iterator so that
it will be bidirectional if the underlying iterator is. -JGS -->
<p>The <tt class="literal"><span class="pre">Predicate</span></tt> must be Assignable, Copy Constructible, and the
expression <tt class="literal"><span class="pre">p(x)</span></tt> must be valid where <tt class="literal"><span class="pre">p</span></tt> is an object of type
<p>The <tt class="literal"><span class="pre">Predicate</span></tt> argument must be Assignable, Copy Constructible, and
the expression <tt class="literal"><span class="pre">p(x)</span></tt> must be valid where <tt class="literal"><span class="pre">p</span></tt> is an object of type
<tt class="literal"><span class="pre">Predicate</span></tt>, <tt class="literal"><span class="pre">x</span></tt> is an object of type
<tt class="literal"><span class="pre">iterator_traits&lt;Iterator&gt;::value_type</span></tt>, and where the type of
<tt class="literal"><span class="pre">p(x)</span></tt> must be convertible to <tt class="literal"><span class="pre">bool</span></tt>.</p>
<p>The <tt class="literal"><span class="pre">Iterator</span></tt> argument shall meet the requirements of Readable
Iterator and Single Pass Iterator or it shall meet the requirements of
Input Iterator.</p>
</div>
<div class="section" id="filter-iterator-models">
<h3><a class="toc-backref" href="#id56" name="filter-iterator-models"><tt class="literal"><span class="pre">filter_iterator</span></tt> models</a></h3>
<p>The concepts that <tt class="literal"><span class="pre">filter_iterator</span></tt> models are dependent on what
concepts the <tt class="literal"><span class="pre">Iterator</span></tt> argument models, as specified in the
following tables.</p>
<table border class="table">
<colgroup>
<col width="33%" />
<col width="67%" />
</colgroup>
<thead valign="bottom">
<tr><th>If <tt class="literal"><span class="pre">Iterator</span></tt> models</th>
<th>then <tt class="literal"><span class="pre">filter_iterator</span></tt> models</th>
</tr>
</thead>
<tbody valign="top">
<tr><td>Single Pass Iterator</td>
<td>Single Pass Iterator</td>
</tr>
<tr><td>Forward Traversal Iterator</td>
<td>Forward Traversal Iterator</td>
</tr>
</tbody>
</table>
<table border class="table">
<colgroup>
<col width="41%" />
<col width="59%" />
</colgroup>
<thead valign="bottom">
<tr><th>If <tt class="literal"><span class="pre">Iterator</span></tt> models</th>
<th>then <tt class="literal"><span class="pre">filter_iterator</span></tt> models</th>
</tr>
</thead>
<tbody valign="top">
<tr><td>Readable Iterator</td>
<td>Readable Iterator</td>
</tr>
<tr><td>Writable Iterator</td>
<td>Writable Iterator</td>
</tr>
<tr><td>Lvalue Iterator</td>
<td>Lvalue Iterator</td>
</tr>
</tbody>
</table>
<table border class="table">
<colgroup>
<col width="63%" />
<col width="38%" />
</colgroup>
<thead valign="bottom">
<tr><th>If <tt class="literal"><span class="pre">Iterator</span></tt> models</th>
<th>then <tt class="literal"><span class="pre">filter_iterator</span></tt> models</th>
</tr>
</thead>
<tbody valign="top">
<tr><td>Readable Iterator, Single Pass Iterator</td>
<td>Input Iterator</td>
</tr>
<tr><td>Readable Lvalue Iterator, Forward Traversal Iterator</td>
<td>Forward Iterator</td>
</tr>
<tr><td>Writable Lvalue Iterator, Forward Traversal Iterator</td>
<td>Mutable Forward Iterator</td>
</tr>
</tbody>
</table>
<table border class="table">
<colgroup>
<col width="33%" />
<col width="67%" />
</colgroup>
<thead valign="bottom">
<tr><th>If <tt class="literal"><span class="pre">Iterator</span></tt> models</th>
<th>then <tt class="literal"><span class="pre">filter_iterator</span></tt> models</th>
</tr>
</thead>
<tbody valign="top">
<tr><td>Input Iterator</td>
<td>Input Iterator, Readable Iterator, Single Pass Iterator</td>
</tr>
<tr><td>Forward Iterator</td>
<td>Forward Iterator, Readable Lvalue Iterator,
Forward Traversal Iterator</td>
</tr>
<tr><td>Mutable Forward Iterator</td>
<td>Mutable Forward Iterator, Writable Lvalue Iterator,
Forward Traversal Iterator</td>
</tr>
</tbody>
</table>
</div>
<div class="section" id="filter-iterator-operations">
<h3><a class="toc-backref" href="#id56" name="filter-iterator-operations"><tt class="literal"><span class="pre">filter_iterator</span></tt> operations</a></h3>
<h3><a class="toc-backref" href="#id57" name="filter-iterator-operations"><tt class="literal"><span class="pre">filter_iterator</span></tt> operations</a></h3>
<p>In addition to those operations required by the concepts that
<tt class="literal"><span class="pre">filter_iterator</span></tt> models, <tt class="literal"><span class="pre">filter_iterator</span></tt> provides the following
operations.</p>
<p><tt class="literal"><span class="pre">filter_iterator();</span></tt></p>
<table class="field-list" frame="void" rules="none">
<col class="field-name" />
@ -1937,19 +1830,19 @@ filter_iterator(
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field"><th class="field-name">Returns:</th><td class="field-body">The object <tt class="literal"><span class="pre">end</span></tt> used to construct <tt class="literal"><span class="pre">*this</span></tt>.</td>
<tr class="field"><th class="field-name">Returns:</th><td class="field-body">A copy of the object <tt class="literal"><span class="pre">end</span></tt> used to construct <tt class="literal"><span class="pre">*this</span></tt>.</td>
</tr>
</tbody>
</table>
</div>
<div class="section" id="counting-iterator">
<h3><a class="toc-backref" href="#id57" name="counting-iterator">Counting iterator</a></h3>
<h3><a class="toc-backref" href="#id58" name="counting-iterator">Counting iterator</a></h3>
<p>The counting iterator adaptor implements dereference by returning a
reference to the base object. The other operations are implemented by
the base <tt class="literal"><span class="pre">m_iterator</span></tt>, as per the inheritance from
<tt class="literal"><span class="pre">iterator_adaptor</span></tt>.</p>
<div class="section" id="class-template-counting-iterator">
<h4><a class="toc-backref" href="#id58" name="class-template-counting-iterator">Class template <tt class="literal"><span class="pre">counting_iterator</span></tt></a></h4>
<h4><a class="toc-backref" href="#id59" name="class-template-counting-iterator">Class template <tt class="literal"><span class="pre">counting_iterator</span></tt></a></h4>
<pre class="literal-block">
template &lt;
class Incrementable
@ -1988,7 +1881,7 @@ the cases when the <tt class="literal"><span class="pre">Incrementable</span></t
</div>
</div>
<div class="section" id="counting-iterator-requirements">
<h3><a class="toc-backref" href="#id59" name="counting-iterator-requirements"><tt class="literal"><span class="pre">counting_iterator</span></tt> requirements</a></h3>
<h3><a class="toc-backref" href="#id60" name="counting-iterator-requirements"><tt class="literal"><span class="pre">counting_iterator</span></tt> requirements</a></h3>
<p>The <tt class="literal"><span class="pre">Incrementable</span></tt> type must be Default Constructible, Copy
Constructible, and Assignable. The default distance is
an implementation defined signed integegral type.</p>
@ -2016,7 +1909,7 @@ i &lt; j
</pre>
</div>
<div class="section" id="counting-iterator-operations">
<h3><a class="toc-backref" href="#id60" name="counting-iterator-operations"><tt class="literal"><span class="pre">counting_iterator</span></tt> operations</a></h3>
<h3><a class="toc-backref" href="#id61" name="counting-iterator-operations"><tt class="literal"><span class="pre">counting_iterator</span></tt> operations</a></h3>
<p><tt class="literal"><span class="pre">counting_iterator();</span></tt></p>
<table class="field-list" frame="void" rules="none">
<col class="field-name" />
@ -2047,7 +1940,7 @@ object copy constructed from <tt class="literal"><span class="pre">x</span></tt>
</table>
</div>
<div class="section" id="function-output-iterator">
<h3><a class="toc-backref" href="#id61" name="function-output-iterator">Function output iterator</a></h3>
<h3><a class="toc-backref" href="#id62" name="function-output-iterator">Function output iterator</a></h3>
<p>The function output iterator adaptor makes it easier to create custom
output iterators. The adaptor takes a unary function and creates a
model of Output Iterator. Each item assigned to the output iterator is
@ -2056,7 +1949,7 @@ iterator is that creating a conforming output iterator is non-trivial,
particularly because the proper implementation usually requires a
proxy object.</p>
<div class="section" id="class-template-function-output-iterator">
<h4><a class="toc-backref" href="#id62" name="class-template-function-output-iterator">Class template <tt class="literal"><span class="pre">function_output_iterator</span></tt></a></h4>
<h4><a class="toc-backref" href="#id63" name="class-template-function-output-iterator">Class template <tt class="literal"><span class="pre">function_output_iterator</span></tt></a></h4>
<pre class="literal-block">
template &lt;class UnaryFunction&gt;
class function_output_iterator {
@ -2084,7 +1977,7 @@ public:
</div>
</div>
<div class="section" id="function-output-iterator-requirements">
<h3><a class="toc-backref" href="#id63" name="function-output-iterator-requirements"><tt class="literal"><span class="pre">function_output_iterator</span></tt> requirements</a></h3>
<h3><a class="toc-backref" href="#id64" name="function-output-iterator-requirements"><tt class="literal"><span class="pre">function_output_iterator</span></tt> requirements</a></h3>
<p>The <tt class="literal"><span class="pre">UnaryFunction</span></tt> must be Assignable, Copy Constructible, and the
expression <tt class="literal"><span class="pre">f(x)</span></tt> must be valid, where <tt class="literal"><span class="pre">f</span></tt> is an object of type
<tt class="literal"><span class="pre">UnaryFunction</span></tt> and <tt class="literal"><span class="pre">x</span></tt> is an object of a type accepted by <tt class="literal"><span class="pre">f</span></tt>.
@ -2092,7 +1985,7 @@ The resulting <tt class="literal"><span class="pre">function_output_iterator</sp
and Incrementable Iterator concepts.</p>
</div>
<div class="section" id="function-output-iterator-operations">
<h3><a class="toc-backref" href="#id64" name="function-output-iterator-operations"><tt class="literal"><span class="pre">function_output_iterator</span></tt> operations</a></h3>
<h3><a class="toc-backref" href="#id65" name="function-output-iterator-operations"><tt class="literal"><span class="pre">function_output_iterator</span></tt> operations</a></h3>
<p><tt class="literal"><span class="pre">explicit</span> <span class="pre">function_output_iterator(const</span> <span class="pre">UnaryFunction&amp;</span> <span class="pre">f</span> <span class="pre">=</span> <span class="pre">UnaryFunction());</span></tt></p>
<table class="field-list" frame="void" rules="none">
<col class="field-name" />
@ -2133,7 +2026,7 @@ a copy of the unary function <tt class="literal"><span class="pre">f</span></tt>
</table>
</div>
<div class="section" id="function-output-iterator-output-proxy-operations">
<h3><a class="toc-backref" href="#id65" name="function-output-iterator-output-proxy-operations"><tt class="literal"><span class="pre">function_output_iterator::output_proxy</span></tt> operations</a></h3>
<h3><a class="toc-backref" href="#id66" name="function-output-iterator-output-proxy-operations"><tt class="literal"><span class="pre">function_output_iterator::output_proxy</span></tt> operations</a></h3>
<p><tt class="literal"><span class="pre">output_proxy(UnaryFunction&amp;</span> <span class="pre">f);</span></tt></p>
<table class="field-list" frame="void" rules="none">
<col class="field-name" />
@ -2167,11 +2060,5 @@ LocalWords: OtherIncrementable Coplien -->
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