</SUP> The Iostreams library provides one Device concept and one Filter concept for each of eight modes. Source, Sink, InputFilter and OutputFilter correspond to the the modes <A HREF="modes.html#input">input</A> and <A HREF="modes.html#output">output</A> and are by far the most important of the Filter and Device concepts.
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    The most common Device and Filter concepts are documented individually. Readers new to the Iostreams library should familiarize themselves with the four central concepts <A H