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| author | bkoz <bkoz@138bc75d-0d04-0410-961f-82ee72b054a4> | 2008-02-12 02:35:48 +0000 |
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| committer | bkoz <bkoz@138bc75d-0d04-0410-961f-82ee72b054a4> | 2008-02-12 02:35:48 +0000 |
| commit | 1db669ed6126b2c083c1ccd5a324bfa5f55c284c (patch) | |
| tree | ff1936ff863d1fb33d2e9533095545b3e56117ba /libstdc++-v3/doc/html/26_numerics/howto.html | |
| parent | 7c119073e88932278c1d6260edea6c231ff8af74 (diff) | |
| download | ppe42-gcc-1db669ed6126b2c083c1ccd5a324bfa5f55c284c.tar.gz ppe42-gcc-1db669ed6126b2c083c1ccd5a324bfa5f55c284c.zip | |
2008-02-11 Benjamin Kosnik <bkoz@redhat.com>
* doc/html/*: Remove all but contents of ext/pb_ds.
* doc/html/index.html: New.
* doc/html/README: New.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@132250 138bc75d-0d04-0410-961f-82ee72b054a4
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diff --git a/libstdc++-v3/doc/html/26_numerics/howto.html b/libstdc++-v3/doc/html/26_numerics/howto.html deleted file mode 100644 index e56659b3804..00000000000 --- a/libstdc++-v3/doc/html/26_numerics/howto.html +++ /dev/null @@ -1,179 +0,0 @@ -<?xml version="1.0" encoding="ISO-8859-1"?> -<!DOCTYPE html - PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" - "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> - -<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> -<head> - <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" /> - <meta name="AUTHOR" content="pme@gcc.gnu.org (Phil Edwards)" /> - <meta name="KEYWORDS" content="HOWTO, libstdc++, GCC, g++, libg++, STL" /> - <meta name="DESCRIPTION" content="HOWTO for the libstdc++ chapter 26." /> - <meta name="GENERATOR" content="vi and eight fingers" /> - <title>libstdc++ HOWTO: Chapter 26: Numerics</title> -<link rel="StyleSheet" href="../lib3styles.css" type="text/css" /> -<link rel="Start" href="../documentation.html" type="text/html" - title="GNU C++ Standard Library" /> -<link rel="Prev" href="../25_algorithms/howto.html" type="text/html" - title="Algorithms" /> -<link rel="Next" href="../27_io/howto.html" type="text/html" - title="Input/Output" /> -<link rel="Copyright" href="../17_intro/license.html" type="text/html" /> -<link rel="Help" href="../faq/index.html" type="text/html" title="F.A.Q." /> -</head> -<body> - -<h1 class="centered"><a name="top">Chapter 26: Numerics</a></h1> - -<p>Chapter 26 deals with building block abstractions to aid in - numerical computing: -</p> -<ul> - <li>Template data structures such as <code>valarray<></code> - and <code>complex<></code>. - </li> - <li>Template numerical functions such as <code>accumulate</code>, - <code>inner_product</code>, <code>partial_sum</code>, and - <code>adjacent_difference</code>. - </li> -</ul> -<p>All of the Standard C math functions are of course included in C++, - and overloaded versions for <code>long</code>, <code>float</code>, and - <code>long double</code> have been added for all of them. -</p> - -<!-- ####################################################### --> -<hr /> -<h1>Contents</h1> -<ul> - <li><a href="#1">Complex Number Processing</a></li> - <li><a href="#2">Array Processing</a></li> - <li><a href="#3">Numerical Functions</a></li> - <li><a href="#4">C99</a></li> -</ul> - -<hr /> - -<!-- ####################################################### --> - -<h2><a name="1">Complex Number Processing</a></h2> - <p>Using <code>complex<></code> becomes even more comple- er, sorry, - <em>complicated</em>, with the not-quite-gratuitously-incompatible - addition of complex types to the C language. David Tribble has - compiled a list of C++98 and C99 conflict points; his description of - C's new type versus those of C++ and how to get them playing together - nicely is -<a href="http://david.tribble.com/text/cdiffs.htm#C99-complex">here</a>. - </p> - <p><code>complex<></code> is intended to be instantiated with a - floating-point type. As long as you meet that and some other basic - requirements, then the resulting instantiation has all of the usual - math operators defined, as well as definitions of <code>op<<</code> - and <code>op>></code> that work with iostreams: <code>op<<</code> - prints <code>(u,v)</code> and <code>op>></code> can read <code>u</code>, - <code>(u)</code>, and <code>(u,v)</code>. - </p> - <p>Return <a href="#top">to top of page</a> or - <a href="../faq/index.html">to the FAQ</a>. - </p> - -<hr /> -<h2><a name="2">Array Processing</a></h2> - <p>One of the major reasons why FORTRAN can chew through numbers so well - is that it is defined to be free of pointer aliasing, an assumption - that C89 is not allowed to make, and neither is C++98. C99 adds a new - keyword, <code>restrict</code>, to apply to individual pointers. The - C++ solution is contained in the library rather than the language - (although many vendors can be expected to add this to their compilers - as an extension). - </p> - <p>That library solution is a set of two classes, five template classes, - and "a whole bunch" of functions. The classes are required - to be free of pointer aliasing, so compilers can optimize the - daylights out of them the same way that they have been for FORTRAN. - They are collectively called <code>valarray</code>, although strictly - speaking this is only one of the five template classes, and they are - designed to be familiar to people who have worked with the BLAS - libraries before. - </p> - <p>Some more stuff should go here once somebody has time to write it. - </p> - <p>Return <a href="#top">to top of page</a> or - <a href="../faq/index.html">to the FAQ</a>. - </p> - -<hr /> -<h2><a name="3">Numerical Functions</a></h2> - <p>There are four generalized functions in the <numeric> header - that follow the same conventions as those in <algorithm>. Each - of them is overloaded: one signature for common default operations, - and a second for fully general operations. Their names are - self-explanatory to anyone who works with numerics on a regular basis: - </p> - <ul> - <li><code>accumulate</code></li> - <li><code>inner_product</code></li> - <li><code>partial_sum</code></li> - <li><code>adjacent_difference</code></li> - </ul> - <p>Here is a simple example of the two forms of <code>accumulate</code>. - </p> - <pre> - int ar[50]; - int someval = somefunction(); - - // ...initialize members of ar to something... - - int sum = std::accumulate(ar,ar+50,0); - int sum_stuff = std::accumulate(ar,ar+50,someval); - int product = std::accumulate(ar,ar+50,1,std::multiplies<int>()); - </pre> - <p>The first call adds all the members of the array, using zero as an - initial value for <code>sum</code>. The second does the same, but uses - <code>someval</code> as the starting value (thus, <code>sum_stuff == sum + - someval</code>). The final call uses the second of the two signatures, - and multiplies all the members of the array; here we must obviously - use 1 as a starting value instead of 0. - </p> - <p>The other three functions have similar dual-signature forms. - </p> - <p>Return <a href="#top">to top of page</a> or - <a href="../faq/index.html">to the FAQ</a>. - </p> - -<hr /> -<h2><a name="4">C99</a></h2> - <p>In addition to the other topics on this page, we'll note here some - of the C99 features that appear in libstdc++. - </p> - <p>The C99 features depend on the <code>--enable-c99</code> configure flag. - This flag is already on by default, but it can be disabled by the - user. Also, the configuration machinery will disable it if the - necessary support for C99 (e.g., header files) cannot be found. - </p> - <p>As of GCC 3.0, C99 support includes classification functions - such as <code>isnormal</code>, <code>isgreater</code>, - <code>isnan</code>, etc. - The functions used for 'long long' support such as <code>strtoll</code> - are supported, as is the <code>lldiv_t</code> typedef. Also supported - are the wide character functions using 'long long', like - <code>wcstoll</code>. - </p> - <p>Return <a href="#top">to top of page</a> or - <a href="../faq/index.html">to the FAQ</a>. - </p> - - - -<!-- ####################################################### --> - -<hr /> -<p class="fineprint"><em> -See <a href="../17_intro/license.html">license.html</a> for copying conditions. -Comments and suggestions are welcome, and may be sent to -<a href="mailto:libstdc++@gcc.gnu.org">the libstdc++ mailing list</a>. -</em></p> - - -</body> -</html> |
