Eurobot2012_Primary
Dependencies: mbed Eurobot_2012_Primary
tvmet/TypePromotion.h
- Committer:
- narshu
- Date:
- 2012-10-17
- Revision:
- 26:0995f61cb7b8
- Parent:
- 25:143b19c1fb05
File content as of revision 26:0995f61cb7b8:
/* * Tiny Vector Matrix Library * Dense Vector Matrix Libary of Tiny size using Expression Templates * * Copyright (C) 2001 - 2007 Olaf Petzold <opetzold@users.sourceforge.net> * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * $Id: TypePromotion.h,v 1.10 2007-06-23 15:58:58 opetzold Exp $ */ #ifndef TVMET_TYPE_PROMOTION_H #define TVMET_TYPE_PROMOTION_H namespace tvmet { /** * \class PrecisionTraits TypePromotion.h "tvmet/TypePromotion.h" * \brief Declaring ranks of types to avoid specializing * * All possible promoted types. For example, bool=1, int=2, float=3, double=4, * etc. We can use a traits class to map from a type such as float onto its * "precision rank". We will promote to whichever type has a higher * "precision rank". f there is no "precision rank" for a type, we'll * promote to whichever type requires more storage space * (and hopefully more precision). */ template<class T> struct PrecisionTraits { enum { rank = 0, /**< the rank of type. */ known = 0 /**< true, if the rank is specialized = known. */ }; }; #define TVMET_PRECISION(T,R) \ template<> \ struct PrecisionTraits< T > { \ enum { \ rank = R, \ known = 1 \ }; \ }; /* * pod types */ TVMET_PRECISION(int, 100) TVMET_PRECISION(unsigned int, 200) TVMET_PRECISION(long, 300) TVMET_PRECISION(unsigned long, 400) #if defined(TVMET_HAVE_LONG_LONG) TVMET_PRECISION(long long, 500) TVMET_PRECISION(unsigned long long, 600) #endif // defined(TVMET_HAVE_LONG_LONG) TVMET_PRECISION(float, 700) TVMET_PRECISION(double, 800) #if defined(TVMET_HAVE_LONG_DOUBLE) TVMET_PRECISION(long double, 900) #endif // defined(TVMET_HAVE_LONG_DOUBLE) /* * complex types */ #if defined(TVMET_HAVE_COMPLEX) TVMET_PRECISION(std::complex<int>, 1000) TVMET_PRECISION(std::complex<unsigned int>, 1100) TVMET_PRECISION(std::complex<long>, 1200) TVMET_PRECISION(std::complex<unsigned long>, 1300) #if defined(TVMET_HAVE_LONG_LONG) TVMET_PRECISION(std::complex<long long>, 1400) TVMET_PRECISION(std::complex<unsigned long long>, 1500) #endif // defined(TVMET_HAVE_LONG_LONG) TVMET_PRECISION(std::complex<float>, 1600) TVMET_PRECISION(std::complex<double>, 1700) #if defined(TVMET_HAVE_LONG_DOUBLE) TVMET_PRECISION(std::complex<long double>, 1800) #endif // defined(TVMET_HAVE_LONG_DOUBLE) #endif // defined(TVMET_HAVE_COMPLEX) /** \class PrecisionTraits<int> TypePromotion.h "tvmet/TypePromotion.h" */ /** \class PrecisionTraits<unsigned int> TypePromotion.h "tvmet/TypePromotion.h" */ /** \class PrecisionTraits<long> TypePromotion.h "tvmet/TypePromotion.h" */ /** \class PrecisionTraits<unsigned long> TypePromotion.h "tvmet/TypePromotion.h" */ /** \class PrecisionTraits<long long> TypePromotion.h "tvmet/TypePromotion.h" */ /** \class PrecisionTraits<unsigned long long> TypePromotion.h "tvmet/TypePromotion.h" */ /** \class PrecisionTraits<float> TypePromotion.h "tvmet/TypePromotion.h" */ /** \class PrecisionTraits<double> TypePromotion.h "tvmet/TypePromotion.h" */ /** \class PrecisionTraits<long double> TypePromotion.h "tvmet/TypePromotion.h" */ /** \class PrecisionTraits< std::complex<int> > TypePromotion.h "tvmet/TypePromotion.h" */ /** \class PrecisionTraits< std::complex<unsigned int> > TypePromotion.h "tvmet/TypePromotion.h" */ /** \class PrecisionTraits< std::complex<long> > TypePromotion.h "tvmet/TypePromotion.h" */ /** \class PrecisionTraits< std::complex<unsigned long> > TypePromotion.h "tvmet/TypePromotion.h" */ /** \class PrecisionTraits< std::complex<long long> > TypePromotion.h "tvmet/TypePromotion.h" */ /** \class PrecisionTraits< std::complex<unsigned long long> > TypePromotion.h "tvmet/TypePromotion.h" */ /** \class PrecisionTraits< std::complex<float> > TypePromotion.h "tvmet/TypePromotion.h" */ /** \class PrecisionTraits< std::complex<double> > TypePromotion.h "tvmet/TypePromotion.h" */ /** \class PrecisionTraits< std::complex<long double> > TypePromotion.h "tvmet/TypePromotion.h" */ #undef TVMET_PRECISION /** * \class AutopromoteTraits TypePromotion.h "tvmet/TypePromotion.h" * \brief The promoted types traits. */ template<class T> struct AutopromoteTraits { typedef T value_type; }; /* * Defines a macro for specializing/defining * the promotion traits. bool, char, unsigned char, short int, etc. will * be autopromote to int, as in C and C++. */ #define TVMET_AUTOPROMOTE(T1,T2) \ template<> \ struct AutopromoteTraits<T1> { \ typedef T2 value_type; \ }; TVMET_AUTOPROMOTE(bool, int) TVMET_AUTOPROMOTE(char, int) TVMET_AUTOPROMOTE(unsigned char, int) TVMET_AUTOPROMOTE(short int, int) TVMET_AUTOPROMOTE(short unsigned int, unsigned int) /** \class AutopromoteTraits<bool> TypePromotion.h "tvmet/TypePromotion.h" */ /** \class AutopromoteTraits<char> TypePromotion.h "tvmet/TypePromotion.h" */ /** \class AutopromoteTraits<unsigned char> TypePromotion.h "tvmet/TypePromotion.h" */ /** \class AutopromoteTraits<short int> TypePromotion.h "tvmet/TypePromotion.h" */ /** \class AutopromoteTraits<short unsigned int> TypePromotion.h "tvmet/TypePromotion.h" */ #undef TVMET_AUTOPROMOTE /** * \class promoteTo TypePromotion.h "tvmet/TypePromotion.h" * \brief Promote to T1. */ template<class T1, class T2, int promoteToT1> struct promoteTo { typedef T1 value_type; }; /** * \class promoteTo<T1,T2,0> TypePromotion.h "tvmet/TypePromotion.h" * \brief Promote to T2 */ template<class T1, class T2> struct promoteTo<T1,T2,0> { typedef T2 value_type; }; /** * \class PromoteTraits TypePromotion.h "tvmet/TypePromotion.h" * \brief Promote type traits */ template<class T1org, class T2org> class PromoteTraits { // Handle promotion of small integers to int/unsigned int typedef typename AutopromoteTraits<T1org>::value_type T1; typedef typename AutopromoteTraits<T2org>::value_type T2; enum { // True if T1 is higher ranked T1IsBetter = int(PrecisionTraits<T1>::rank) > int(PrecisionTraits<T2>::rank), // True if we know ranks for both T1 and T2 knowBothRanks = PrecisionTraits<T1>::known && PrecisionTraits<T2>::known, // True if we know T1 but not T2 knowT1butNotT2 = PrecisionTraits<T1>::known && !(PrecisionTraits<T2>::known), // True if we know T2 but not T1 knowT2butNotT1 = PrecisionTraits<T2>::known && !(PrecisionTraits<T1>::known), // True if T1 is bigger than T2 T1IsLarger = sizeof(T1) >= sizeof(T2), // We know T1 but not T2: true // We know T2 but not T1: false // Otherwise, if T1 is bigger than T2: true defaultPromotion = knowT1butNotT2 ? false : (knowT2butNotT1 ? true : T1IsLarger), // If we have both ranks, then use them. // If we have only one rank, then use the unknown type. // If we have neither rank, then promote to the larger type. promoteToT1 = (knowBothRanks ? T1IsBetter : defaultPromotion) ? 1 : 0 }; public: typedef typename promoteTo<T1,T2,promoteToT1>::value_type value_type; }; } // namespace tvmet #endif // TVMET_TYPE_PROMOTION_H // Local Variables: // mode:C++ // tab-width:8 // End: