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Added information about empty data.

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Edward Diener
2015-05-17 00:46:10 -04:00
parent 4360660e39
commit 633f1e679a
4 changed files with 101 additions and 105 deletions
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doc/data/tuples.html
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<html>
<head>
<meta content="text/html; charset=windows-1252" http-equiv="content-type">
<title>tuples.html</title>
<link rel="stylesheet" type="text/css" href="../styles.css">
</head>
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parenthesis.&nbsp; For example, </div>
<div class="code"> (<i>a</i>, <i>b</i>, <i>c</i>) </div>
<div> ...is a <i>tuple</i> of <i>3</i> elements--<i>a</i>, <i>b</i>, and
<i>c</i>. </div>
<i>c</i>.<br>
<br>
A <i>tuple </i>cannot be empty. The notation '()' as a <i>tuple </i>is
a single element <i>tuple </i>of size 1, where the element is empty. </div>
<div> <i>Tuples</i> are fast and easy to use.&nbsp; With variadic macro
support it is not necessary to know the size of a <i>tuple; </i>without
variadic macro support&nbsp;all access to <i>tuples</i> requires
knowledge of its size. Use a <i>tuple </i>instead of an <i>array</i> if
your compiler supports variadic macros, since a <i>tuple </i>has all of
the functionality as an <i>array </i>and is easier syntactically to use.</div>
the functionality as an <i>array </i>and is easier syntactically to use.
The only functionality an <i>array </i>has which a <i>tuple </i>does
not have is that an <i>array </i>can be empty whereas a <i>tuple </i>cannot
be empty.</div>
<div> Elements of a <i>tuple</i> can be extracted with <b>BOOST_PP_TUPLE_ELEM</b>.
</div>
<h4>Primitives</h4>