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removed constraints on reference from Readable Iterator

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[SVN r21641]
This commit is contained in:
Jeremy Siek
2004-01-12 19:54:57 +00:00
parent db9d88ad7b
commit 21381f3fa7
3 changed files with 38 additions and 47 deletions
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39
doc/new-iter-concepts.html
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@ -384,24 +384,12 @@ type <tt class="literal"><span class="pre">T</span></tt>.</p>
<td>Any non-reference,
non-cv-qualified type</td>
</tr>
<tr><td><tt class="literal"><span class="pre">iterator_traits&lt;X&gt;::reference</span></tt></td>
<td><tt class="literal"><span class="pre">R</span></tt>, Convertible to
<tt class="literal"><span class="pre">T</span></tt></td>
<td>&nbsp;</td>
</tr>
<tr><td><tt class="literal"><span class="pre">*a</span></tt></td>
<td>Convertible to <tt class="literal"><span class="pre">R</span></tt>,
Convertible to <tt class="literal"><span class="pre">T</span></tt></td>
<td>Convertible to <tt class="literal"><span class="pre">T</span></tt></td>
<td>pre: <tt class="literal"><span class="pre">a</span></tt> is
dereferenceable. If <tt class="literal"><span class="pre">a</span>
<span class="pre">==</span> <span class="pre">b</span></tt> then <tt class="literal"><span class="pre">*a</span></tt> is
equivalent to <tt class="literal"><span class="pre">*b</span></tt></td>
</tr>
<tr><td><tt class="literal"><span class="pre">static_cast&lt;T&gt;(</span>
<span class="pre">static_cast&lt;R&gt;(*a)</span> <span class="pre">)</span></tt></td>
<td><tt class="literal"><span class="pre">T</span></tt></td>
<td>equivalent to
<tt class="literal"><span class="pre">static_cast&lt;T&gt;(*a)</span></tt></td>
equivalent to <tt class="literal"><span class="pre">*b</span></tt>.</td>
</tr>
<tr><td><tt class="literal"><span class="pre">a-&gt;m</span></tt></td>
<td><tt class="literal"><span class="pre">U&amp;</span></tt></td>
@ -411,10 +399,8 @@ to <tt class="literal"><span class="pre">(*a).m</span></tt></td>
</tr>
</tbody>
</table>
<!-- TR1: the originally-proposed requirement that typeof(*a) == R
was too restrictive. Now we just require that it's
convertible to R and that accessing a T through that conversion
is equivalent to accessing a T directly. -->
<!-- We won't say anything about iterator_traits<X>::reference until
the DR is resolved. -->
<a class="target" id="writable-iterator" name="writable-iterator"></a></div>
<div class="section" id="writable-iterators-lib-writable-iterators">
<h4><a class="toc-backref" href="#id12" name="writable-iterators-lib-writable-iterators">Writable Iterators [lib.writable.iterators]</a></h4>
@ -480,8 +466,9 @@ exchanged</td>
</div>
<div class="section" id="lvalue-iterators-lib-lvalue-iterators">
<h4><a class="toc-backref" href="#id14" name="lvalue-iterators-lib-lvalue-iterators">Lvalue Iterators [lib.lvalue.iterators]</a></h4>
<p>The <em>Lvalue Iterator</em> concept adds the requirement that the
<tt class="literal"><span class="pre">reference</span></tt> type be a reference to the value type of the iterator.</p>
<p>The <em>Lvalue Iterator</em> concept adds the requirement that the return
type of <tt class="literal"><span class="pre">operator*</span></tt> type be a reference to the value type of the
iterator.</p>
<table class="table" frame="border" rules="all">
<colgroup>
<col width="42%" />
@ -493,16 +480,20 @@ exchanged</td>
</tr>
<tr><th>Expression</th>
<th>Return Type</th>
<th>Assertion</th>
<th>Note/Assertion</th>
</tr>
</thead>
<tbody valign="top">
<tr><td><tt class="literal"><span class="pre">iterator_traits&lt;X&gt;::reference</span></tt></td>
<tr><td><tt class="literal"><span class="pre">*a</span></tt></td>
<td><tt class="literal"><span class="pre">T&amp;</span></tt></td>
<td><tt class="literal"><span class="pre">T</span></tt> is <em>cv</em>
<tt class="literal"><span class="pre">iterator_traits&lt;X&gt;::value_type</span></tt>
where <em>cv</em> is an optional
cv-qualification</td>
cv-qualification.
pre: <tt class="literal"><span class="pre">a</span></tt> is
dereferenceable. If <tt class="literal"><span class="pre">a</span>
<span class="pre">==</span> <span class="pre">b</span></tt> then <tt class="literal"><span class="pre">*a</span></tt> is
equivalent to <tt class="literal"><span class="pre">*b</span></tt>.</td>
</tr>
</tbody>
</table>
@ -889,7 +880,7 @@ LocalWords: TraversalTag typename lvalues DWA Hmm JGS mis enum -->
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Generated on: 2004-01-12 19:53 UTC.
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