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[SVN r24430]
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Thorsten Jørgen Ottosen
2004-08-12 10:58:13 +00:00
parent 7d81f9a845
commit 8378643b44
13 changed files with 507 additions and 351 deletions
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doc/faq.html
+27 -19
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@@ -29,6 +29,9 @@
When it is possible to come up with one, the client might choose to construct a <code >std::pair&lt;const_iterator,const_iterator&gt;</code>
object.
</p>
<p>
Note that an <a href="utility_class.html#iter_range">iterator_range</a>
is somewhat more convenient than a <code>pair</code>. </p>
<li >
<i>Why is there not supplied more types or more functions?</i>
<p >
@@ -58,11 +61,13 @@
</li>
<li>
<i>Should I use qualified syntax, for example
<blockquote><pre>boost::begin( r ); </pre></blockquote>
<blockquote><pre>
<span class=identifier>boost</span><span class=special>::</span><span class=identifier>begin</span><span class=special>( </span><span class=identifier>r </span><span class=special>); </span>
</pre></blockquote>
instead of
<blockquote>
<pre>using namespace boost;
begin( r )</pre></blockquote>
<pre><span class=keyword>using </span><span class=keyword>namespace </span><span class=identifier>boost</span><span class=special>;</span>
<span class=identifier>begin</span><span class=special>( </span><span class=identifier>r </span><span class=special>)</span></pre></blockquote>
when calling functions in this library? If so, can I still rely on argument
dependent lookup (ADL) to kick in?</i>
<p>
@@ -73,27 +78,30 @@ begin( r )</pre></blockquote>
Daniel Frey on comp.lang.std.c++ in the thread "Whence Swap" and
it is best explained by some code: <blockquote>
<pre>
namespace boost
{
namespace range_detail
{
template< class T >
typename iterator_of&lt;T>:type begin( T& r )
{ /* normal implementation */ }
}
<span class=keyword>namespace </span><span class=identifier>boost</span>
<span class=special>{
</span><span class=keyword>namespace </span><span class=identifier>range_detail
</span><span class=special>{
</span><span class=keyword>template</span><span class=special>&lt; </span><span class=keyword>class </span><span class=identifier>T </span><span class=special>&gt;
</span><span class=keyword>typename </span><span class=identifier>iterator_of</span><span class=special>&lt;</span><span class=identifier>T</span><span class=special>&gt;:</span><span class=identifier>type </span><span class=identifier>begin</span><span class=special>( </span><span class=identifier>T</span><span class=special>&amp; </span><span class=identifier>r </span><span class=special>)
</span><span class=special>{ </span><span class=comment>/* normal implementation */ </span><span class=special>}
</span><span class=special>}
template< class T >
typename iterator_of&lt;T>::type begin( T& r )
{
//
</span><span class=keyword>template</span><span class=special>&lt; </span><span class=keyword>class </span><span class=identifier>T </span><span class=special>&gt;
</span><span class=keyword>typename </span><span class=identifier>iterator_of</span><span class=special>&lt;</span><span class=identifier>T</span><span class=special>&gt;::</span><span class=identifier>type </span><span class=identifier>begin</span><span class=special>( </span><span class=identifier>T</span><span class=special>&amp; </span><span class=identifier>r </span><span class=special>)
</span><span class=special>{
</span><span class=comment>//
// Create ADL hook
//
using range_detail::begin;
return begin( r );
}
} </pre>
</span><span class=keyword>using </span><span class=identifier>range_detail</span><span class=special>::</span><span class=identifier>begin</span><span class=special>;
</span><span class=keyword>return </span><span class=identifier>begin</span><span class=special>( </span><span class=identifier>r </span><span class=special>);
</span><span class=special>}</span>
<span class=special>} </span>
</pre>
</blockquote>
Cool indeed!
</p>
</ol>