| .. Copyright David Abrahams 2006. Distributed under the Boost |
| .. Software License, Version 1.0. (See accompanying |
| .. file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
| |
| The filter iterator adaptor creates a view of an iterator range in |
| which some elements of the range are skipped. A predicate function |
| object controls which elements are skipped. When the predicate is |
| applied to an element, if it returns ``true`` then the element is |
| retained and if it returns ``false`` then the element is skipped |
| over. When skipping over elements, it is necessary for the filter |
| adaptor to know when to stop so as to avoid going past the end of the |
| underlying range. A filter iterator is therefore constructed with pair |
| of iterators indicating the range of elements in the unfiltered |
| sequence to be traversed. |
| |
