DualUseFilter

Description

A DualUseFilter is a Filter which can act as an InputFilter or as an OutputFilter, but not as both simultaneously.

DualUseFilters help reduce the number of different Filter types required to implement a particlar filtering algorithm. For example, by implementing basic_regex_filter as a DualUseFilter, the Iostreams library avoids having to define separate templates basic_regex_input_filter and basic_regex_output_filter.

Refinement of

InputFilter, OutputFilter.

Associated Types

Character type	The type of the characters in the filtered sequences
Category	A type convertible to `filter_tag` and to `dual_use`
Mode	The unique most-derived mode tag to which Category is convertible

Valid Expressions / Semantics

Same as BidirectionalFilter.

Exceptions

Same as BidirectionalFilter.

Models

The Text Processing Filters.
The compression and decompression filters, except for basic_gzip_decompressor.

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)