1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 2<HTML> 3<HEAD> 4 <TITLE>Direct</TITLE> 5 <LINK REL="stylesheet" HREF="../../../../boost.css"> 6 <LINK REL="stylesheet" HREF="../theme/iostreams.css"> 7</HEAD> 8<BODY> 9 10<!-- Begin Banner --> 11 12 <H1 CLASS="title">Direct</H1> 13 <HR CLASS="banner"> 14 15<!-- End Banner --> 16 17<H2>Description</H2> 18 19<P> 20 A Device is Direct if it provides access to its controlled sequences as in-memory arrays rather than <I>via</I> a socket-like interface. The difference between a Device which is Direct and one which is not is reflected in the specifications of the various Device refinements, <I>e.g.</I>, <A HREF="source.html">Source</A> and <A HREF="sink.html">Sink</A>.</P> 21</P> 22 23<P> 24 A model of <A HREF="device.html">Device</A> which does not model Direct is called <SPAN CLASS="term">indirect</SPAN>. 25</P> 26 27<H2>Refinement of</H2> 28 29<P><A HREF="device.html">Device</A>.</P> 30 31<A NAME="types"></A> 32<H2>Associated Types</H2> 33 34<P>Same as <A HREF="device.html#types">Device</A>, with the following additional requirements:</P> 35 36<TABLE CELLPADDING="5" BORDER="1"> 37 <TR><TD>Category</TD><TD>A type convertible to <A HREF="../guide/traits.html#category_tags"><CODE>device_tag</CODE></A> and to <A HREF="../guide/traits.html#category_tags"><CODE>direct_tag</CODE></A></TD></TR> 38</TABLE> 39 40<A NAME="expressions"></A> 41<H2>Valid Expressions / Semantics</H2> 42 43<P>Same as <A HREF="device.html">Device</A>.</P> 44 45<H2>Models</H2> 46 47<UL> 48 <LI>The <A HREF="../classes/array.html">Array Devices</A> 49 <LI>The <A HREF="../classes/mapped_file.html">Memory-Mapped File Devices</A> 50</UL> 51 52<!-- Begin Footer --> 53 54<HR> 55 56<P CLASS="copyright">© Copyright 2008 <a href="http://www.coderage.com/" target="_top">CodeRage, LLC</a><br/>© Copyright 2004-2007 <a href="https://www.boost.org/users/people/jonathan_turkanis.html" target="_top">Jonathan Turkanis</a></P> 57<P CLASS="copyright"> 58 Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at <A HREF="http://www.boost.org/LICENSE_1_0.txt">http://www.boost.org/LICENSE_1_0.txt</A>) 59</P> 60 61<!-- End Footer --> 62 63</BODY>