| 1 | <html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>3. CLHEP Foundation Library</title><link rel="stylesheet" href="../xml/XSLCustomizationLayer/G4HTMLStylesheet.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.71.1"><link rel="start" href="index.html" title="Geant4 User's Guide for Application Developers"><link rel="up" href="apa.html" title="Appendix . Appendix"><link rel="prev" href="apas02.html" title="2. Histogramming"><link rel="next" href="apas04.html" title="4. C++ Standard Template Library"><script language="JavaScript">
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| 8 | </script></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">3.
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| 9 | CLHEP Foundation Library
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| 10 | </th></tr><tr><td width="20%" align="left"><a accesskey="p" href="apas02.html"><img src="AllResources/IconsGIF/prev.gif" alt="Prev"></a> </td><th width="60%" align="center">Appendix .
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| 11 | Appendix
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| 12 | </th><td width="20%" align="right"> <a accesskey="n" href="apas04.html"><img src="AllResources/IconsGIF/next.gif" alt="Next"></a></td></tr></table><hr></div><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="sect.Clhep"></a>3.
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| 13 | CLHEP Foundation Library
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| 14 | </h2></div></div></div><p>
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| 15 | <a href="http://cern.ch/proj-clhep/" target="_top">
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| 16 | CLHEP
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| 17 | </a>
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| 18 | is a set of Class Libraries containing many
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| 19 | basic classes for use in High Energy Physics.
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| 20 | </p><p>
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| 21 | Both a CLHEP
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| 22 | <a href="http://cern.ch/proj-clhep/manual/RefGuide/" target="_top">
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| 23 | Reference Guide
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| 24 | </a>
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| 25 | and a
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| 26 | <a href="http://cern.ch/proj-clhep/manual/UserGuide/" target="_top">
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| 27 | User Guide
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| 28 | </a>
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| 29 | are available.
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| 30 | </p><h5><a name="id557761"></a>
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| 31 | Origin and current situation of CLHEP
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| 32 | </h5><p>
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| 33 | CLHEP started in 1992 as a library for fundamental classes
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| 34 | mostly needed for, and in fact derived from, the MC event generator
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| 35 | MC++ written in C++. Since then various authors added classes to
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| 36 | this package, including several contributions made by developers in
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| 37 | the Geant4 Collaboration.
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| 38 | </p><h5><a name="id557775"></a>
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| 39 | Geant4 and CLHEP
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| 40 | </h5><p>
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| 41 | The Geant4 project contributed to the development of CLHEP. The
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| 42 | random number package, physics units and constants, and some of the
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| 43 | numeric and geometry classes had their origins in Geant4.
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| 44 | </p><p>
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| 45 | Geant4 also benefits from the development of CLHEP. In addition
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| 46 | to the already mentioned classes for random numbers and numerics,
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| 47 | we use the classes for points, vectors, and planes and their
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| 48 | transformations in 3D space, and lorentz vectors and their
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| 49 | transformations. Although these classes have Geant4 names like
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| 50 | G4ThreeVector, these are just typedefs to the CLHEP classes.
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| 51 | </p></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="apas02.html"><img src="AllResources/IconsGIF/prev.gif" alt="Prev"></a> </td><td width="20%" align="center"><a accesskey="u" href="apa.html"><img src="AllResources/IconsGIF/up.gif" alt="Up"></a></td><td width="40%" align="right"> <a accesskey="n" href="apas04.html"><img src="AllResources/IconsGIF/next.gif" alt="Next"></a></td></tr><tr><td width="40%" align="left" valign="top">2.
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| 52 | Histogramming
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| 53 | </td><td width="20%" align="center"><a accesskey="h" href="index.html"><img src="AllResources/IconsGIF/home.gif" alt="Home"></a></td><td width="40%" align="right" valign="top"> 4.
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| 54 | C++ Standard Template Library
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| 55 | </td></tr></table></div></body></html>
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