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Edouard DUPIN
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<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>
<body>
<h4>Arrays</h4>
<div> An <i>array</i> is a data structure consisting of a two-element <i>tuple</i>.&nbsp;
The first element is the number of elements in the <i>array</i>.&nbsp;
The second element is another <i>tuple</i> of the elements in the <i>array</i>.&nbsp;
For example, </div>
<div class="code"> (<i>3</i>, (<i>a</i>, <i>b</i>, <i>c</i>)) </div>
<div> ...is an <i>array</i> of <i>3</i> elements--<i>a</i>, <i>b</i>, and
<i>c</i>. </div>
<div> The primary strength of <i>arrays</i> is that they store their own
size.&nbsp; Because of this, access to elements does not require the
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.<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. 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>,
and an <i>array</i> can be converted to the more primitive <i>tuple</i>
data structure with <b>BOOST_PP_ARRAY_DATA</b>. </div>
<h4>Primitives</h4>
<ul>
<li><a href="../ref/array_data.html">BOOST_PP_ARRAY_DATA</a></li>
<li><a href="../ref/array_elem.html">BOOST_PP_ARRAY_ELEM</a></li>
<li><a href="../ref/array_size.html">BOOST_PP_ARRAY_SIZE</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>

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<html>
<head>
<meta content="text/html; charset=windows-1252" http-equiv="content-type">
<title>lists.html</title>
<link rel="stylesheet" type="text/css" href="../styles.css">
</head>
<body>
<h4>Lists</h4>
<div> A <i>list</i> is a simple cons-style list with a head and a
tail.&nbsp; The head of a <i>list</i> is an element, and the tail is
either another <i>list</i> or <b>BOOST_PP_NIL</b>. For example, </div>
<div class="code"> (<i>a</i>, (<i>b</i>, (<i>c</i>, <b>BOOST_PP_NIL</b>)))
</div>
<div> ...is a <i>list</i> of <i>3</i> elements--<i>a</i>, <i>b</i>, and <i>c</i>.
</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.<br>
<br>
A list can be empty and therefore have a size of 0. An empty list is
represented by the notation <b>BOOST_PP_NIL.<br>
<br>
</b></div>
<div> Elements of a <i>list</i> can be extracted with <b>BOOST_PP_LIST_FIRST</b>
and <b>BOOST_PP_LIST_REST</b>.&nbsp; </div>
<h4>Primitives</h4>
<ul>
<li><a href="../ref/list_first.html">BOOST_PP_LIST_FIRST</a></li>
<li><a href="../ref/list_rest.html">BOOST_PP_LIST_REST</a></li>
<li><a href="../ref/nil.html">BOOST_PP_NIL</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>

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<html>
<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 ^
BOOST_PP_SEQ_FOLD_LEFT(REVERSE, BOOST_PP_EMPTY, SEQ)()
// #1 #2
// 1) placeholder for "empty" seq
// 2) remove placeholder
#define SEQ_B (1)(2)(3)
#define INC(s, state, elem) state (BOOST_PP_INC(elem))
// append to tail ^
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>
</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>
<body>
<h4>Tuples</h4>
<div> A <i>tuple</i> is a simple comma-separated list of elements inside
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>.<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.
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>
<ul>
<li><a href="../ref/tuple_elem.html">BOOST_PP_TUPLE_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>