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[SVN r9108]
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Jeremy Siek 2001-02-11 04:34:32 +00:00
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filter_iterator.htm
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@ -46,12 +46,12 @@ namespace boost {
Generator</a></h2>
The class <tt>filter_iterator_generator</tt> is a helper class who's
purpose is to construct a filter iterator adaptor type. The template
purpose is to construct a filter iterator type. The template
parameters for this class are the <tt>Predicate</tt> function object
type and the <tt>BaseIterator</tt> type that is being wrapped. In most
cases the associated types for the wrapped iterator can be deduced
from <tt>std::iterator_traits</tt>, but in some situations the user
may want to override these types, so there are also template
type and the <tt>BaseIterator</tt> type that is being wrapped. In
most cases the associated types for the wrapped iterator can be
deduced from <tt>std::iterator_traits</tt>, but in some situations the
user may want to override these types, so there are also template
parameters for each of the iterator's associated types.
<pre>
@ -60,11 +60,12 @@ template &lt;class Predicate, class BaseIterator,
class filter_iterator_generator
{
public:
typedef ... type; // the resulting filter <a href="./iterator_adaptor.htm"><tt>iterator_adaptor</tt></a> type
typedef ... type; // the resulting filter iterator type which is <a href="./iterator_adaptor.htm"><tt>iterator_adaptor</tt></a>
typedef ... policies_type; // the policies type for the iterator adaptor
}
</pre>
<h3>Example</h3>
The following example uses filter iterator to print out all the
@ -172,8 +173,22 @@ href="www.sgi.com/tech/stl/InputIterator.html">InputIterator</a> or <a
href="www.sgi.com/tech/stl/ForwardIterator.html">ForwardIterator</a>
depending on the adapted iterator type.
<p>
<h3>Members</h3>
The filter iterator type implements all of the member functions and
operators required of the <a
href="http://www.sgi.com/tech/stl/ForwardIterator.html">ForwardIterator</a>
concept. In addition it has the following constructor:
<pre>filter_iterator_generator::type(const BaseIterator& it, const Policies& p = Policies())</pre>
<p>
The policies type has only one public function, which is its constructor:
<pre>filter_iterator_generator::policies_type(const Predicate& p, const BaseIterator& end)</pre>
<p>
<hr>
<p>