1<html> 2 <head> 3 <meta content="text/html; charset=windows-1252" http-equiv="content-type"> 4 <title>tuples.html</title> 5 <link rel="stylesheet" type="text/css" href="../styles.css"> 6 </head> 7 <body> 8 <h4>Tuples</h4> 9 <div> A <i>tuple</i> is a simple comma-separated list of elements inside 10 parenthesis. For example, </div> 11 <div class="code"> (<i>a</i>, <i>b</i>, <i>c</i>) </div> 12 <div> ...is a <i>tuple</i> of <i>3</i> elements--<i>a</i>, <i>b</i>, and 13 <i>c</i>.<br> 14 <br> 15 A <i>tuple </i>cannot be empty. The notation '()' as a <i>tuple </i>is 16 a single element <i>tuple </i>of size 1, where the element is empty. </div> 17 <div> <i>Tuples</i> are fast and easy to use. With variadic macro 18 support it is not necessary to know the size of a <i>tuple; </i>without 19 variadic macro support all access to <i>tuples</i> requires 20 knowledge of its size. Use a <i>tuple </i>instead of an <i>array</i> if 21 your compiler supports variadic macros, since a <i>tuple </i>has all of 22 the functionality as an <i>array </i>and is easier syntactically to use. 23 The only functionality an <i>array </i>has which a <i>tuple </i>does 24 not have is that an <i>array </i>can be empty whereas a <i>tuple </i>cannot 25 be empty.</div> 26 <div> Elements of a <i>tuple</i> can be extracted with <b>BOOST_PP_TUPLE_ELEM</b>. 27 </div> 28 <h4>Primitives</h4> 29 <ul> 30 <li><a href="../ref/tuple_elem.html">BOOST_PP_TUPLE_ELEM</a></li> 31 </ul> 32 <hr size="1"> 33 <div style="margin-left: 0px;"> <i>� Copyright <a href="http://www.housemarque.com" 34 target="_top">Housemarque Oy</a> 2002</i> <br> 35 <i>� Copyright Paul Mensonides 2002</i> </div> 36 <div style="margin-left: 0px;"> 37 <p><small>Distributed under the Boost Software License, Version 1.0. (See 38 accompanying file <a href="../../../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> 39 or copy at <a href="http://www.boost.org/LICENSE_1_0.txt">www.boost.org/LICENSE_1_0.txt</a>)</small></p> 40 </div> 41 </body> 42</html> 43