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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/sequences.html
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@ -1,30 +1,23 @@
<html>
<head>
<title>sequences.html</title>
<link rel="stylesheet" type="text/css" href="../styles.css">
</head>
<body>
<h4>
Sequences
</h4>
<div>
A <i>sequence</i> (abbreviated to <i>seq</i>) is a group of adjacent parenthesized elements. For example,
</div>
<div class="code">
(<i>a</i>)(<i>b</i>)(<i>c</i>)
</div>
<div>
...is a <i>seq</i> of <i>3</i> elements--<i>a</i>, <i>b</i>, and <i>c</i>.
</div>
<div>
<i>Sequences</i> are data structures that merge the properties of both <i>lists</i> and
<i>tuples</i> with the exception that a <i>seq</i> cannot be empty.&nbsp;
Therefore, an "empty" <i>seq</i> is considered a special case scenario that
must be handled separately in C++.
</div>
<div class="code">
<pre>
#define SEQ (x)(y)(z)
<head>
<meta content="text/html; charset=windows-1252" http-equiv="content-type">
<title>sequences.html</title>
<link rel="stylesheet" type="text/css" href="../styles.css">
</head>
<body>
<h4> Sequences </h4>
<div> A <i>sequence</i> (abbreviated to <i>seq</i>) is a group of adjacent
parenthesized elements. For example, </div>
<div class="code"> (<i>a</i>)(<i>b</i>)(<i>c</i>) </div>
<div> ...is a <i>seq</i> of <i>3</i> elements--<i>a</i>, <i>b</i>, and <i>c</i>.
</div>
<div> <i>Sequences</i> are data structures that merge the properties of
both <i>lists</i> and <i>tuples</i> with the exception that a <i>seq, </i>like
a <i>tuple, </i>cannot be empty.&nbsp; Therefore, an "empty" <i>seq</i>
is considered a special case scenario that must be handled separately in
C++. </div>
<div class="code">
<pre>#define SEQ (x)(y)(z)
#define REVERSE(s, state, elem) (elem) state
// append to head ^
@ -41,35 +34,27 @@ BOOST_PP_SEQ_FOLD_RIGHT(INC, BOOST_PP_SEQ_NIL, SEQ)
// ^
// special placeholder that will be "eaten"
// by appending to the tail
</pre>
</div>
<div>
<i>Sequences</i> are extremely efficient.&nbsp; Element access speed approaches
random access--even with <i>seqs</i> of up to <i>256</i> elements.&nbsp; This
is because element access (among other things) is implemented iteratively
rather than recursively.&nbsp; Therefore, elements can be accessed at extremely
high indices even on preprocessors with low maximum expansion depths.
</div>
<div>
Elements of a <i>seq</i> can be extracted with <b>BOOST_PP_SEQ_ELEM</b>.
</div>
<h4>
Primitives
</h4>
<ul>
<li>
<a href="../ref/seq_elem.html">BOOST_PP_SEQ_ELEM</a></li>
</ul>
<hr size="1">
<div style="margin-left: 0px;">
<i><EFBFBD> Copyright <a href="http://www.housemarque.com" target="_top">Housemarque Oy</a> 2002</i>
</br><i><EFBFBD> Copyright Paul Mensonides 2002</i>
</div>
<div style="margin-left: 0px;">
<p><small>Distributed under the Boost Software License, Version 1.0. (See
accompanying file <a href="../../../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or
copy at <a href=
"http://www.boost.org/LICENSE_1_0.txt">www.boost.org/LICENSE_1_0.txt</a>)</small></p>
</div>
</body>
</pre> </div>
<div> <i>Sequences</i> are extremely efficient.&nbsp; Element access speed
approaches random access--even with <i>seqs</i> of up to <i>256</i>
elements.&nbsp; This is because element access (among other things) is
implemented iteratively rather than recursively.&nbsp; Therefore, elements
can be accessed at extremely high indices even on preprocessors with low
maximum expansion depths. </div>
<div> Elements of a <i>seq</i> can be extracted with <b>BOOST_PP_SEQ_ELEM</b>.
</div>
<h4> Primitives </h4>
<ul>
<li> <a href="../ref/seq_elem.html">BOOST_PP_SEQ_ELEM</a></li>
</ul>
<hr size="1">
<div style="margin-left: 0px;"> <i><EFBFBD> Copyright <a href="http://www.housemarque.com"
target="_top">Housemarque Oy</a> 2002</i> <br>
<i><EFBFBD> Copyright Paul Mensonides 2002</i> </div>
<div style="margin-left: 0px;">
<p><small>Distributed under the Boost Software License, Version 1.0. (See
accompanying file <a href="../../../../LICENSE_1_0.txt">LICENSE_1_0.txt</a>
or copy at <a href="http://www.boost.org/LICENSE_1_0.txt">www.boost.org/LICENSE_1_0.txt</a>)</small></p>
</div>
</body>
</html>