projects / ceph.git / blame
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|---|---|---|
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1 | <HTML> |
| 2 | <!-- | |
| 3 | Copyright (c) Jeremy Siek, Lie-Quan Lee, and Andrew Lumsdaine 2000 | |
| 4 | ||
| 5 | Distributed under the Boost Software License, Version 1.0. | |
| 6 | (See accompanying file LICENSE_1_0.txt or copy at | |
| 7 | http://www.boost.org/LICENSE_1_0.txt) | |
| 8 | --> | |
| 9 | <Head> | |
| 10 | <Title>BasicMatrix</Title> | |
| 11 | <BODY BGCOLOR="#ffffff" LINK="#0000ee" TEXT="#000000" VLINK="#551a8b" | |
| 12 | ALINK="#ff0000"> | |
| 13 | <IMG SRC="../../../boost.png" | |
| 14 | ALT="C++ Boost" width="277" height="86"> | |
| 15 | ||
| 16 | <BR Clear> | |
| 17 | ||
| 18 | <H1><A NAME="concept:BasicMatrix"></A> | |
| 19 | BasicMatrix | |
| 20 | </H1> | |
| 21 | ||
| 22 | The BasicMatrix concept provides a minimalist interface for | |
| 23 | accessing elements from a 2 dimensional table of values. | |
| 24 | ||
| 25 | ||
| 26 | <H3>Refinement of</H3> | |
| 27 | ||
| 28 | none | |
| 29 | ||
| 30 | <h3>Notation</h3> | |
| 31 | ||
| 32 | <Table> | |
| 33 | <TR> | |
| 34 | <TD>{<tt>M,I,V</tt>}</TD> | |
| 35 | <TD>The matrix, index, and values types that together model the BasicMatrix concept.</TD> | |
| 36 | </TR> | |
| 37 | ||
| 38 | <TR> | |
| 39 | <TD><tt>A</tt></TD> | |
| 40 | <TD>An object of type <tt>M</tt>.</TD> | |
| 41 | </TR> | |
| 42 | ||
| 43 | <TR> | |
| 44 | <TD><tt>i, j</tt></TD> | |
| 45 | <TD>Objects of type <tt>I</tt>.</TD> | |
| 46 | </TR> | |
| 47 | ||
| 48 | </table> | |
| 49 | ||
| 50 | <H3>Associated Types</H3> | |
| 51 | ||
| 52 | none | |
| 53 | ||
| 54 | <h3>Valid Expressions</h3> | |
| 55 | ||
| 56 | <Table border> | |
| 57 | ||
| 58 | <tr> | |
| 59 | <td><a name="sec:elt-access"><TT>A[i][j]</TT></a></TD> | |
| 60 | <TD>Returns a reference to the element object stored at index <tt>(i,j)</tt><br> | |
| 61 | Return type: <TT>V&</TT> for mutable <tt>A</tt> or <TT>const V&</TT> | |
| 62 | for constant <tt>A</tt>. | |
| 63 | </TD> | |
| 64 | </TR> | |
| 65 | ||
| 66 | </table> | |
| 67 | ||
| 68 | <H3>Complexity guarantees</H3> | |
| 69 | ||
| 70 | Element access is constant time. | |
| 71 | ||
| 72 | <H3>Concept Checking Class</H3> | |
| 73 | ||
| 74 | <pre> | |
| 75 | template <class M, class I, class V> | |
| 76 | struct BasicMatrixConcept | |
| 77 | { | |
| 78 | void constraints() { | |
| 79 | V& elt = A[i][j]; | |
| 80 | const_constraints(A); | |
| 81 | ignore_unused_variable_warning(elt); | |
| 82 | } | |
| 83 | void const_constraints(const M& A) { | |
| 84 | const V& elt = A[i][j]; | |
| 85 | ignore_unused_variable_warning(elt); | |
| 86 | } | |
| 87 | M A; | |
| 88 | I i, j; | |
| 89 | }; | |
| 90 | </pre> | |
| 91 | ||
| 92 | <br> | |
| 93 | <HR> | |
| 94 | <TABLE> | |
| 95 | <TR valign=top> | |
| 96 | <TD nowrap>Copyright © 2000-2001</TD><TD> | |
| 97 | <A HREF="http://www.boost.org/people/jeremy_siek.htm">Jeremy Siek</A>, | |
| 98 | Indiana University (<A | |
| 99 | HREF="mailto:jsiek@osl.iu.edu">jsiek@osl.iu.edu</A>) | |
| 100 | </TD></TR></TABLE> | |
| 101 | ||
| 102 | </BODY> | |
| 103 | </HTML> |