| 1 | <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> |
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| 2 | <HTML> |
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| 3 | <HEAD> |
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| 4 | <TITLE>Direct</TITLE> |
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| 5 | <LINK REL="stylesheet" HREF="../../../../boost.css"> |
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| 6 | <LINK REL="stylesheet" HREF="../theme/iostreams.css"> |
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| 7 | </HEAD> |
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| 8 | <BODY> |
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| 9 | |
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| 10 | <!-- Begin Banner --> |
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| 11 | |
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| 12 | <H1 CLASS="title">Direct</H1> |
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| 13 | <HR CLASS="banner"> |
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| 14 | |
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| 15 | <!-- End Banner --> |
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| 16 | |
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| 17 | <H2>Description</H2> |
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| 18 | |
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| 19 | <P> |
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| 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> |
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| 21 | </P> |
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| 22 | |
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| 23 | <P> |
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| 24 | A model of <A HREF="device.html">Device</A> which does not model Direct is called <SPAN CLASS="term">indirect</SPAN>. |
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| 25 | </P> |
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| 26 | |
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| 27 | <H2>Refinement of</H2> |
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| 28 | |
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| 29 | <P><A HREF="device.html">Device</A>.</P> |
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| 30 | |
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| 31 | <A NAME="types"></A> |
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| 32 | <H2>Associated Types</H2> |
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| 33 | |
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| 34 | <P>Same as <A HREF="device.html#types">Device</A>, with the following additional requirements:</P> |
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| 35 | |
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| 36 | <TABLE CELLPADDING="5" BORDER="1"> |
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| 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> |
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| 38 | </TABLE> |
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| 39 | |
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| 40 | <A NAME="expressions"></A> |
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| 41 | <H2>Valid Expressions / Semantics</H2> |
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| 42 | |
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| 43 | <P>Same as <A HREF="device.html">Device</A>.</P> |
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| 44 | |
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| 45 | <H2>Models</H2> |
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| 46 | |
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| 47 | <UL> |
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| 48 | <LI>The <A HREF="../classes/array.html">Array Devices</A> |
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| 49 | <LI>The <A HREF="../classes/mapped_file.html">Memory-Mapped File Devices</A> |
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| 50 | </UL> |
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| 51 | |
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| 52 | <!-- Begin Footer --> |
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| 53 | |
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| 54 | <HR> |
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| 55 | <P CLASS="copyright">Revised |
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| 56 | <!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan --> |
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| 57 | 20 May, 2004 |
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| 58 | <!--webbot bot="Timestamp" endspan i-checksum="38504" --> |
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| 59 | </P> |
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| 60 | |
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| 61 | <P CLASS="copyright">© Copyright <A HREF="http://www.kangaroologic.com" TARGET="_top">Jonathan Turkanis</A>, 2004</P> |
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| 62 | <P CLASS="copyright"> |
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| 63 | 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>) |
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| 64 | </P> |
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| 65 | |
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| 66 | <!-- End Footer --> |
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| 67 | |
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| 68 | </BODY> |
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