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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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12
doc/data/arrays.html
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@ -1,5 +1,6 @@
<html>
<head>
<meta content="text/html; charset=windows-1252" http-equiv="content-type">
<title>arrays.html</title>
<link rel="stylesheet" type="text/css" href="../styles.css">
</head>
@ -17,12 +18,19 @@
size.&nbsp; It only requires that an element exists at a certain index. </div>
<div> This allows macro parameters to be variable in size and allows data
states to change size without the user explicitly keeping track of the
size independently.</div>
size independently.<br>
<br>
An <i>array </i>can be empty and have no elements. An empty array has a
0 size. The notation for an empty array is '(0,())'.<br>
<br>
<span style="font-style: italic;"> </span></div>
<div>With variadic macro support a <i>tuple </i>has all of the
functionality as an <i>array</i>, knows its own size, and is easier
syntactically to use. Because of that an <i>array</i> should be used, as
opposed to a <i>tuple</i>, only if your compiler does not support
variadic macros.<br>
variadic macros. The only advantage an <i>array </i>has over a <i>tuple
</i>is that an <i>array </i>can be empty while a <i>tuple </i>always
has at least one element and therefore can never have a size of 0.<br>
<br>
Elements of an <i>array</i> can be extracted with <b>BOOST_PP_ARRAY_ELEM</b>,
an <i>array's</i> size can be extracted with <b>BOOST_PP_ARRAY_SIZE</b>,