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Diffstat (limited to 'extern/Eigen3/Eigen/src/Eigen2Support/Meta.h')
-rw-r--r-- | extern/Eigen3/Eigen/src/Eigen2Support/Meta.h | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/extern/Eigen3/Eigen/src/Eigen2Support/Meta.h b/extern/Eigen3/Eigen/src/Eigen2Support/Meta.h new file mode 100644 index 00000000000..6e500b79a2e --- /dev/null +++ b/extern/Eigen3/Eigen/src/Eigen2Support/Meta.h @@ -0,0 +1,86 @@ +// This file is part of Eigen, a lightweight C++ template library +// for linear algebra. +// +// Copyright (C) 2011 Benoit Jacob <jacob.benoit.1@gmail.com> +// +// Eigen 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 3 of the License, or (at your option) any later version. +// +// Alternatively, you can redistribute it and/or +// modify it under the terms of the GNU General Public License as +// published by the Free Software Foundation; either version 2 of +// the License, or (at your option) any later version. +// +// Eigen 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 or the +// GNU General Public License for more details. +// +// You should have received a copy of the GNU Lesser General Public +// License and a copy of the GNU General Public License along with +// Eigen. If not, see <http://www.gnu.org/licenses/>. + +#ifndef EIGEN2_META_H +#define EIGEN2_META_H + +template<typename T> +struct ei_traits : internal::traits<T> +{}; + +struct ei_meta_true { enum { ret = 1 }; }; +struct ei_meta_false { enum { ret = 0 }; }; + +template<bool Condition, typename Then, typename Else> +struct ei_meta_if { typedef Then ret; }; + +template<typename Then, typename Else> +struct ei_meta_if <false, Then, Else> { typedef Else ret; }; + +template<typename T, typename U> struct ei_is_same_type { enum { ret = 0 }; }; +template<typename T> struct ei_is_same_type<T,T> { enum { ret = 1 }; }; + +template<typename T> struct ei_unref { typedef T type; }; +template<typename T> struct ei_unref<T&> { typedef T type; }; + +template<typename T> struct ei_unpointer { typedef T type; }; +template<typename T> struct ei_unpointer<T*> { typedef T type; }; +template<typename T> struct ei_unpointer<T*const> { typedef T type; }; + +template<typename T> struct ei_unconst { typedef T type; }; +template<typename T> struct ei_unconst<const T> { typedef T type; }; +template<typename T> struct ei_unconst<T const &> { typedef T & type; }; +template<typename T> struct ei_unconst<T const *> { typedef T * type; }; + +template<typename T> struct ei_cleantype { typedef T type; }; +template<typename T> struct ei_cleantype<const T> { typedef typename ei_cleantype<T>::type type; }; +template<typename T> struct ei_cleantype<const T&> { typedef typename ei_cleantype<T>::type type; }; +template<typename T> struct ei_cleantype<T&> { typedef typename ei_cleantype<T>::type type; }; +template<typename T> struct ei_cleantype<const T*> { typedef typename ei_cleantype<T>::type type; }; +template<typename T> struct ei_cleantype<T*> { typedef typename ei_cleantype<T>::type type; }; + +/** \internal In short, it computes int(sqrt(\a Y)) with \a Y an integer. + * Usage example: \code ei_meta_sqrt<1023>::ret \endcode + */ +template<int Y, + int InfX = 0, + int SupX = ((Y==1) ? 1 : Y/2), + bool Done = ((SupX-InfX)<=1 ? true : ((SupX*SupX <= Y) && ((SupX+1)*(SupX+1) > Y))) > + // use ?: instead of || just to shut up a stupid gcc 4.3 warning +class ei_meta_sqrt +{ + enum { + MidX = (InfX+SupX)/2, + TakeInf = MidX*MidX > Y ? 1 : 0, + NewInf = int(TakeInf) ? InfX : int(MidX), + NewSup = int(TakeInf) ? int(MidX) : SupX + }; + public: + enum { ret = ei_meta_sqrt<Y,NewInf,NewSup>::ret }; +}; + +template<int Y, int InfX, int SupX> +class ei_meta_sqrt<Y, InfX, SupX, true> { public: enum { ret = (SupX*SupX <= Y) ? SupX : InfX }; }; + +#endif // EIGEN2_META_H |