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