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ClippedCast.h
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00001 /********************************************************************
00002 **                Image Component Library (ICL)                    **
00003 **                                                                 **
00004 ** Copyright (C) 2006-2013 CITEC, University of Bielefeld          **
00005 **                         Neuroinformatics Group                  **
00006 ** Website: www.iclcv.org and                                      **
00007 **          http://opensource.cit-ec.de/projects/icl               **
00008 **                                                                 **
00009 ** File   : ICLUtils/src/ICLUtils/ClippedCast.h                    **
00010 ** Module : ICLUtils                                               **
00011 ** Authors: Christof Elbrechter                                    **
00012 **                                                                 **
00013 **                                                                 **
00014 ** GNU LESSER GENERAL PUBLIC LICENSE                               **
00015 ** This file may be used under the terms of the GNU Lesser General **
00016 ** Public License version 3.0 as published by the                  **
00017 **                                                                 **
00018 ** Free Software Foundation and appearing in the file LICENSE.LGPL **
00019 ** included in the packaging of this file.  Please review the      **
00020 ** following information to ensure the license requirements will   **
00021 ** be met: http://www.gnu.org/licenses/lgpl-3.0.txt                **
00022 **                                                                 **
00023 ** The development of this software was supported by the           **
00024 ** Excellence Cluster EXC 277 Cognitive Interaction Technology.    **
00025 ** The Excellence Cluster EXC 277 is a grant of the Deutsche       **
00026 ** Forschungsgemeinschaft (DFG) in the context of the German       **
00027 ** Excellence Initiative.                                          **
00028 **                                                                 **
00029 ********************************************************************/
00030 
00031 #pragma once
00032 
00033 #include <ICLUtils/CompatMacros.h>
00034 #include <limits>
00035 
00036 namespace icl{
00037   namespace utils{
00039     template <class T>
00040     inline T clip(T tX, T tMin, T tMax){
00041       return tX < tMin ? tMin : tX > tMax ? tMax : tX; 
00042     }
00043     
00044     
00045     template<class T>
00046     inline bool is_float_type(){
00047       return false;
00048     }
00049     
00051     template<> inline bool is_float_type<float>() { return true; }
00052     template<> inline bool is_float_type<double>() { return true; }
00055 
00056     template<class S, class D> 
00057     inline D clipped_cast(S src){
00058       if(is_float_type<D>()){ //hopefully this is const enough for optimize this expresseion out
00059         return src < -(std::numeric_limits<D>::max)() ? -(std::numeric_limits<D>::max)() : 
00060         src > (std::numeric_limits<D>::max)() ? (std::numeric_limits<D>::max)() : 
00061         static_cast<D>(src);
00062       }else{
00063         return src < (std::numeric_limits<D>::min)() ? (std::numeric_limits<D>::min)() : 
00064         src > (std::numeric_limits<D>::max)() ? (std::numeric_limits<D>::max)() : 
00065         static_cast<D>(src);
00066       }
00067     }
00068     
00070 
00071 #define SPECIALISE_CLIPPED_CAST(T) template<> inline T clipped_cast<T,T>(T t) { return t; }
00072     SPECIALISE_CLIPPED_CAST(int)
00073     SPECIALISE_CLIPPED_CAST(unsigned int)
00074     SPECIALISE_CLIPPED_CAST(char)
00075     SPECIALISE_CLIPPED_CAST(unsigned char)
00076     SPECIALISE_CLIPPED_CAST(short)
00077     SPECIALISE_CLIPPED_CAST(unsigned short)
00078     SPECIALISE_CLIPPED_CAST(long)
00079     SPECIALISE_CLIPPED_CAST(unsigned long)
00080     SPECIALISE_CLIPPED_CAST(bool)
00081     SPECIALISE_CLIPPED_CAST(float)
00082     SPECIALISE_CLIPPED_CAST(double)
00083   #undef SPECIALISE_CLIPPED_CAST
00084 
00086   } // namespace utils
00087 }
00088 
00089 
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