mirror of
https://github.com/boostorg/safe_numerics.git
synced 2026-02-12 12:22:16 +00:00
57 lines
3.5 KiB
HTML
57 lines
3.5 KiB
HTML
<html>
|
|
<head>
|
|
<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
|
|
<title>Introduction</title>
|
|
<link rel="stylesheet" href="boostbook.css" type="text/css">
|
|
<meta name="generator" content="DocBook XSL Stylesheets V1.76.1">
|
|
<link rel="home" href="index.html" title="Safe Numerics">
|
|
<link rel="up" href="index.html" title="Safe Numerics">
|
|
<link rel="prev" href="index.html" title="Safe Numerics">
|
|
<link rel="next" href="tutorial.html" title="Tutorial">
|
|
</head>
|
|
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
|
|
<table cellpadding="2" width="100%"><tr>
|
|
<td valign="top"><img alt="pre-boost" width="30%" height="30%" src="pre-boost.jpg"></td>
|
|
<td align="center"><a href="../../index.html">Home</a></td>
|
|
<td align="center"><a href="http://www.boost.org/doc/libs">Libraries</a></td>
|
|
<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td>
|
|
<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td>
|
|
<td align="center"><a href="../../more/index.htm">More</a></td>
|
|
</tr></table>
|
|
<hr>
|
|
<div class="spirit-nav">
|
|
<a accesskey="p" href="index.html"><img src="images/prev.png" alt="Prev"></a><a accesskey="u" href="index.html"><img src="images/up.png" alt="Up"></a><a accesskey="h" href="index.html"><img src="images/home.png" alt="Home"></a><a accesskey="n" href="tutorial.html"><img src="images/next.png" alt="Next"></a>
|
|
</div>
|
|
<div class="section">
|
|
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
|
|
<a name="safe_numerics.introduction"></a>Introduction</h2></div></div></div>
|
|
<p>Arithmetic operations in C++ are NOT guarenteed to yield a correct
|
|
mathematical result. This feature is inherited from the early days of C.
|
|
The behavior of <code class="computeroutput">int</code>, <code class="computeroutput">unsigned int</code> and others
|
|
were designed to map closely to the underlying hardware. Computer hardware
|
|
implements these types as a fixed number of bits. When the result of
|
|
arithmetic operations exceeds this number of bits, the result is undefined
|
|
and usually not what the programmer intended. It is incumbent up the C++
|
|
programmer to guarentee that this behavior does not result in incorrect
|
|
behavior of the program. This library implements special versions of these
|
|
data types which behave exactly like the original ones EXCEPT that the
|
|
results of these operations are checked to be sure that an exception will
|
|
be thrown anytime an attempt is made to store the result of an undefined
|
|
operation.</p>
|
|
<p>Additionally, we define data types <code class="computeroutput">safe_signed_range<MIN,
|
|
MAX></code> and <code class="computeroutput">safe_unsigned_range<MIN, MAX></code> which
|
|
will throw an exception if an attempt is made to store a result which is
|
|
outside the closed range [MIN, MAX]</p>
|
|
</div>
|
|
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
|
|
<td align="left"></td>
|
|
<td align="right"><div class="copyright-footer">Copyright © 2012 Robert Ramey<p><a href="???" target="_top">Subject to Boost Software License</a></p>
|
|
</div></td>
|
|
</tr></table>
|
|
<hr>
|
|
<div class="spirit-nav">
|
|
<a accesskey="p" href="index.html"><img src="images/prev.png" alt="Prev"></a><a accesskey="u" href="index.html"><img src="images/up.png" alt="Up"></a><a accesskey="h" href="index.html"><img src="images/home.png" alt="Home"></a><a accesskey="n" href="tutorial.html"><img src="images/next.png" alt="Next"></a>
|
|
</div>
|
|
</body>
|
|
</html>
|