Image Component Library (ICL)
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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