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<HTML>
<!--
-- Copyright (c) Jeremy Siek, Lie-Quan Lee, and Andrew Lumsdaine 2000
--
-- Distributed under the Boost Software License, Version 1.0.
-- (See accompanying file LICENSE_1_0.txt or copy at
-- http://www.boost.org/LICENSE_1_0.txt)
-->
<Head>
<Title>BasicMatrix</Title>
<BODY BGCOLOR="#ffffff" LINK="#0000ee" TEXT="#000000" VLINK="#551a8b"
ALINK="#ff0000">
<IMG SRC="../../../boost.png"
ALT="C++ Boost" width="277" height="86">
<BR Clear>
<H1><A NAME="concept:BasicMatrix"></A>
BasicMatrix
</H1>
The BasicMatrix concept provides a minimalist interface for
accessing elements from a 2 dimensional table of values.
<H3>Refinement of</H3>
none
<h3>Notation</h3>
<Table>
<TR>
<TD>{<tt>M,I,V</tt>}</TD>
<TD>The matrix, index, and values types that together model the BasicMatrix concept.</TD>
</TR>
<TR>
<TD><tt>A</tt></TD>
<TD>An object of type <tt>M</tt>.</TD>
</TR>
<TR>
<TD><tt>i, j</tt></TD>
<TD>Objects of type <tt>I</tt>.</TD>
</TR>
</table>
<H3>Associated Types</H3>
none
<h3>Valid Expressions</h3>
<Table border>
<tr>
<td><a name="sec:elt-access"><TT>A[i][j]</TT></a></TD>
<TD>Returns a reference to the element object stored at index <tt>(i,j)</tt><br>
Return type: <TT>V&</TT> for mutable <tt>A</tt> or <TT>const V&</TT>
for constant <tt>A</tt>.
</TD>
</TR>
</table>
<H3>Complexity guarantees</H3>
Element access is constant time.
<H3>Concept Checking Class</H3>
<pre>
template <class M, class I, class V>
struct BasicMatrixConcept
{
void constraints() {
V& elt = A[i][j];
const_constraints(A);
ignore_unused_variable_warning(elt);
}
void const_constraints(const M& A) {
const V& elt = A[i][j];
ignore_unused_variable_warning(elt);
}
M A;
I i, j;
};
</pre>
<br>
<HR>
<TABLE>
<TR valign=top>
<TD nowrap>Copyright © 2000-2001</TD><TD>
<A HREF="http://www.boost.org/people/jeremy_siek.htm">Jeremy Siek</A>,
Indiana University (<A
HREF="mailto:jsiek@osl.iu.edu">jsiek@osl.iu.edu</A>)
</TD></TR></TABLE>
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