00001 /*!@file Util/fpe.H floating-point exceptions */ 00002 00003 // //////////////////////////////////////////////////////////////////// // 00004 // The iLab Neuromorphic Vision C++ Toolkit - Copyright (C) 2001 by the // 00005 // University of Southern California (USC) and the iLab at USC. // 00006 // See http://iLab.usc.edu for information about this project. // 00007 // //////////////////////////////////////////////////////////////////// // 00008 // Major portions of the iLab Neuromorphic Vision Toolkit are protected // 00009 // under the U.S. patent ``Computation of Intrinsic Perceptual Saliency // 00010 // in Visual Environments, and Applications'' by Christof Koch and // 00011 // Laurent Itti, California Institute of Technology, 2001 (patent // 00012 // pending; application number 09/912,225 filed July 23, 2001; see // 00013 // http://pair.uspto.gov/cgi-bin/final/home.pl for current status). // 00014 // //////////////////////////////////////////////////////////////////// // 00015 // This file is part of the iLab Neuromorphic Vision C++ Toolkit. // 00016 // // 00017 // The iLab Neuromorphic Vision C++ Toolkit is free software; you can // 00018 // redistribute it and/or modify it under the terms of the GNU General // 00019 // Public License as published by the Free Software Foundation; either // 00020 // version 2 of the License, or (at your option) any later version. // 00021 // // 00022 // The iLab Neuromorphic Vision C++ Toolkit is distributed in the hope // 00023 // that it will be useful, but WITHOUT ANY WARRANTY; without even the // 00024 // implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR // 00025 // PURPOSE. See the GNU General Public License for more details. // 00026 // // 00027 // You should have received a copy of the GNU General Public License // 00028 // along with the iLab Neuromorphic Vision C++ Toolkit; if not, write // 00029 // to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, // 00030 // Boston, MA 02111-1307 USA. // 00031 // //////////////////////////////////////////////////////////////////// // 00032 // 00033 // Primary maintainer for this file: Rob Peters <rjpeters@usc.edu> 00034 // $HeadURL: svn://isvn.usc.edu/software/invt/trunk/saliency/src/Util/fpe.H $ 00035 // $Id: fpe.H 4663 2005-06-23 17:47:28Z rjpeters $ 00036 // 00037 00038 #ifndef FPE_H_DEFINED 00039 #define FPE_H_DEFINED 00040 00041 00042 /* 00043 Here's a state diagram for turning floating-point exceptions on/off 00044 and locked/unlocked. In this diagram "fpe" is an abbreviation for 00045 "fpExceptions" in the functions declared below. 00046 00047 * 00048 * _____ fpeOff() fpeOff() _____ 00049 * /no-op\ fpeOn() fpeOn() /no-op\ 00050 * / \ / \ 00051 * .===============. / \ .================. 00052 * | FPE-LOCKED-ON | <-' `-> | FPE-LOCKED-OFF | 00053 * '===============' '================' 00054 * ^ | ^ | 00055 * fpeLock() | | fpeLock() | | 00056 * | | | | 00057 * | | fpeUnlock() | | fpeUnlock() 00058 * | v fpeOn() | v 00059 * .===============. <<------------------- .================. 00060 * | FPE-ON | | FPE-OFF | 00061 * '===============' ------------------->> '================' 00062 * fpeOff() 00063 00064 */ 00065 00066 //! Turn floating-point exceptions on 00067 void fpExceptionsOn(); 00068 00069 //! Turn floating-point exceptions off 00070 void fpExceptionsOff(); 00071 00072 //! Lock floating-point exceptions in their current state. 00073 /*! That is, if FPEs are on now, they will stay locked on even if 00074 someone calls fpExceptionsOff(); likewise, if FPEs are off now, 00075 they will stay locked off even if someone calls 00076 fpExceptionsOn(). */ 00077 void fpExceptionsLock(); 00078 00079 //! Unlock floating-point exceptions. 00080 /*! This does not turn FPEs on or off, but does make it possible for 00081 the state to be changed again via fpExceptionsOn() or 00082 fpExceptionsOff(). */ 00083 void fpExceptionsUnlock(); 00084 00085 //! Check whether floating-point exceptions are on 00086 bool fpIsEnabled(); 00087 00088 //! Check whether floating-point exceptions are locked in their current state 00089 bool fpIsLocked(); 00090 00091 00092 // ###################################################################### 00093 /* So things look consistent in everyone's emacs... */ 00094 /* Local Variables: */ 00095 /* indent-tabs-mode: nil */ 00096 /* End: */ 00097 00098 #endif // !FPE_H_DEFINED
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