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removed same diff type req from Interoperator

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and did some work on permutation iterator


[SVN r21705]
This commit is contained in:
Jeremy Siek
2004-01-13 21:00:31 +00:00
parent 9540444061
commit d2dae62215
4 changed files with 195 additions and 75 deletions
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22
doc/new-iter-concepts.html
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@ -827,11 +827,11 @@ random_access_traversal_tag for consistency -->
<h4><a class="toc-backref" href="#id21" name="interoperable-iterators-lib-interoperable-iterators">Interoperable Iterators [lib.interoperable.iterators]</a></h4>
<p>A class or built-in type <tt class="literal"><span class="pre">X</span></tt> that models Single Pass Iterator is
<em>interoperable with</em> a class or built-in type <tt class="literal"><span class="pre">Y</span></tt> that also models
Single Pass Iterator if both <tt class="literal"><span class="pre">X</span></tt> and <tt class="literal"><span class="pre">Y</span></tt> have the same difference
type and traversal tag and if the following expressions are valid and
respect the stated semantics. In the tables below, <tt class="literal"><span class="pre">x</span></tt> is an object
of type <tt class="literal"><span class="pre">X</span></tt>, <tt class="literal"><span class="pre">y</span></tt> is an object of type <tt class="literal"><span class="pre">Y</span></tt>, <tt class="literal"><span class="pre">Distance</span></tt> is
<tt class="literal"><span class="pre">iterator_traits&lt;X&gt;::difference_type</span></tt>, and <tt class="literal"><span class="pre">n</span></tt> represents a
Single Pass Iterator if both <tt class="literal"><span class="pre">X</span></tt> and <tt class="literal"><span class="pre">Y</span></tt> have the same traversal
tag and if the following expressions are valid and respect the stated
semantics. In the tables below, <tt class="literal"><span class="pre">x</span></tt> is an object of type <tt class="literal"><span class="pre">X</span></tt>,
<tt class="literal"><span class="pre">y</span></tt> is an object of type <tt class="literal"><span class="pre">Y</span></tt>, <tt class="literal"><span class="pre">Distance</span></tt> is
<tt class="literal"><span class="pre">iterator_traits&lt;Y&gt;::difference_type</span></tt>, and <tt class="literal"><span class="pre">n</span></tt> represents a
constant object of type <tt class="literal"><span class="pre">Distance</span></tt>.</p>
<p>If the traversal tag for <tt class="literal"><span class="pre">X</span></tt> and <tt class="literal"><span class="pre">Y</span></tt> is convertible to
<tt class="literal"><span class="pre">single_pass_traversal_tag</span></tt> then the following requirements must be
@ -940,8 +940,9 @@ ordering relation</td>
</tr>
<tr><td><tt class="literal"><span class="pre">y</span> <span class="pre">-</span> <span class="pre">x</span></tt></td>
<td><tt class="literal"><span class="pre">Distance</span></tt></td>
<td><tt class="literal"><span class="pre">x</span> <span class="pre">&lt;</span> <span class="pre">y</span> <span class="pre">?</span>&nbsp; <span class="pre">distance(x,y)</span>
<span class="pre">:</span> <span class="pre">-distance(y,x)</span></tt></td>
<td><tt class="literal"><span class="pre">x</span> <span class="pre">&lt;</span> <span class="pre">y</span> <span class="pre">?</span>
<span class="pre">distance(Y(x),y)</span>
<span class="pre">:</span> <span class="pre">-distance(y,Y(x))</span></tt></td>
<td>pre: there exists a
value <tt class="literal"><span class="pre">n</span></tt> of
<tt class="literal"><span class="pre">Distance</span></tt> such that
@ -950,8 +951,9 @@ value <tt class="literal"><span class="pre">n</span></tt> of
</tr>
<tr><td><tt class="literal"><span class="pre">x</span> <span class="pre">-</span> <span class="pre">y</span></tt></td>
<td><tt class="literal"><span class="pre">Distance</span></tt></td>
<td><tt class="literal"><span class="pre">y</span> <span class="pre">&lt;</span> <span class="pre">x</span> <span class="pre">?</span>&nbsp; <span class="pre">distance(y,x)</span>
<span class="pre">:</span> <span class="pre">-distance(x,y)</span></tt></td>
<td><tt class="literal"><span class="pre">y</span> <span class="pre">&lt;</span> <span class="pre">x</span> <span class="pre">?</span>
<span class="pre">distance(y,Y(x))</span>
<span class="pre">:</span> <span class="pre">-distance(Y(x),y)</span></tt></td>
<td>pre: there exists a
value <tt class="literal"><span class="pre">n</span></tt> of
<tt class="literal"><span class="pre">Distance</span></tt> such that
@ -1023,7 +1025,7 @@ LocalWords: TraversalTag typename lvalues DWA Hmm JGS mis enum -->
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