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> 19BasicMatrix 20</H1> 21 22The BasicMatrix concept provides a minimalist interface for 23accessing elements from a 2 dimensional table of values. 24 25 26<H3>Refinement of</H3> 27 28none 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 52none 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> 61Return type: <TT>V&</TT> for mutable <tt>A</tt> or <TT>const V&</TT> 62for constant <tt>A</tt>. 63</TD> 64</TR> 65 66</table> 67 68<H3>Complexity guarantees</H3> 69 70Element 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>, 98Indiana University (<A 99HREF="mailto:jsiek@osl.iu.edu">jsiek@osl.iu.edu</A>) 100</TD></TR></TABLE> 101 102</BODY> 103</HTML> 104
