Meta.h
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00001 // This file is part of Eigen, a lightweight C++ template library
00002 // for linear algebra.
00003 //
00004 // Copyright (C) 2011 Benoit Jacob <jacob.benoit.1@gmail.com>
00005 //
00006 // Eigen is free software; you can redistribute it and/or
00007 // modify it under the terms of the GNU Lesser General Public
00008 // License as published by the Free Software Foundation; either
00009 // version 3 of the License, or (at your option) any later version.
00010 //
00011 // Alternatively, you can redistribute it and/or
00012 // modify it under the terms of the GNU General Public License as
00013 // published by the Free Software Foundation; either version 2 of
00014 // the License, or (at your option) any later version.
00015 //
00016 // Eigen is distributed in the hope that it will be useful, but WITHOUT ANY
00017 // WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
00018 // FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License or the
00019 // GNU General Public License for more details.
00020 //
00021 // You should have received a copy of the GNU Lesser General Public
00022 // License and a copy of the GNU General Public License along with
00023 // Eigen. If not, see <http://www.gnu.org/licenses/>.
00024 
00025 #ifndef EIGEN2_META_H
00026 #define EIGEN2_META_H
00027 
00028 template<typename T>
00029 struct ei_traits : internal::traits<T>
00030 {};
00031 
00032 struct ei_meta_true {  enum { ret = 1 }; };
00033 struct ei_meta_false { enum { ret = 0 }; };
00034 
00035 template<bool Condition, typename Then, typename Else>
00036 struct ei_meta_if { typedef Then ret; };
00037 
00038 template<typename Then, typename Else>
00039 struct ei_meta_if <false, Then, Else> { typedef Else ret; };
00040 
00041 template<typename T, typename U> struct ei_is_same_type { enum { ret = 0 }; };
00042 template<typename T> struct ei_is_same_type<T,T> { enum { ret = 1 }; };
00043 
00044 template<typename T> struct ei_unref { typedef T type; };
00045 template<typename T> struct ei_unref<T&> { typedef T type; };
00046 
00047 template<typename T> struct ei_unpointer { typedef T type; };
00048 template<typename T> struct ei_unpointer<T*> { typedef T type; };
00049 template<typename T> struct ei_unpointer<T*const> { typedef T type; };
00050 
00051 template<typename T> struct ei_unconst { typedef T type; };
00052 template<typename T> struct ei_unconst<const T> { typedef T type; };
00053 template<typename T> struct ei_unconst<T const &> { typedef T & type; };
00054 template<typename T> struct ei_unconst<T const *> { typedef T * type; };
00055 
00056 template<typename T> struct ei_cleantype { typedef T type; };
00057 template<typename T> struct ei_cleantype<const T>   { typedef typename ei_cleantype<T>::type type; };
00058 template<typename T> struct ei_cleantype<const T&>  { typedef typename ei_cleantype<T>::type type; };
00059 template<typename T> struct ei_cleantype<T&>        { typedef typename ei_cleantype<T>::type type; };
00060 template<typename T> struct ei_cleantype<const T*>  { typedef typename ei_cleantype<T>::type type; };
00061 template<typename T> struct ei_cleantype<T*>        { typedef typename ei_cleantype<T>::type type; };
00062 
00066 template<int Y,
00067          int InfX = 0,
00068          int SupX = ((Y==1) ? 1 : Y/2),
00069          bool Done = ((SupX-InfX)<=1 ? true : ((SupX*SupX <= Y) && ((SupX+1)*(SupX+1) > Y))) >
00070                                 // use ?: instead of || just to shut up a stupid gcc 4.3 warning
00071 class ei_meta_sqrt
00072 {
00073     enum {
00074       MidX = (InfX+SupX)/2,
00075       TakeInf = MidX*MidX > Y ? 1 : 0,
00076       NewInf = int(TakeInf) ? InfX : int(MidX),
00077       NewSup = int(TakeInf) ? int(MidX) : SupX
00078     };
00079   public:
00080     enum { ret = ei_meta_sqrt<Y,NewInf,NewSup>::ret };
00081 };
00082 
00083 template<int Y, int InfX, int SupX>
00084 class ei_meta_sqrt<Y, InfX, SupX, true> { public:  enum { ret = (SupX*SupX <= Y) ? SupX : InfX }; };
00085 
00086 #endif // EIGEN2_META_H


re_vision
Author(s): Dorian Galvez-Lopez
autogenerated on Sun Jan 5 2014 11:31:59