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Diffstat (limited to 'extern/Eigen2/Eigen/src/Core/NumTraits.h')
-rw-r--r-- | extern/Eigen2/Eigen/src/Core/NumTraits.h | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/extern/Eigen2/Eigen/src/Core/NumTraits.h b/extern/Eigen2/Eigen/src/Core/NumTraits.h new file mode 100644 index 00000000000..b27284a78bc --- /dev/null +++ b/extern/Eigen2/Eigen/src/Core/NumTraits.h @@ -0,0 +1,142 @@ +// This file is part of Eigen, a lightweight C++ template library +// for linear algebra. Eigen itself is part of the KDE project. +// +// Copyright (C) 2006-2008 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 EIGEN_NUMTRAITS_H +#define EIGEN_NUMTRAITS_H + +/** \class NumTraits + * + * \brief Holds some data about the various numeric (i.e. scalar) types allowed by Eigen. + * + * \param T the numeric type about which this class provides data. Recall that Eigen allows + * only the following types for \a T: \c int, \c float, \c double, + * \c std::complex<float>, \c std::complex<double>, and \c long \c double (especially + * useful to enforce x87 arithmetics when SSE is the default). + * + * The provided data consists of: + * \li A typedef \a Real, giving the "real part" type of \a T. If \a T is already real, + * then \a Real is just a typedef to \a T. If \a T is \c std::complex<U> then \a Real + * is a typedef to \a U. + * \li A typedef \a FloatingPoint, giving the "floating-point type" of \a T. If \a T is + * \c int, then \a FloatingPoint is a typedef to \c double. Otherwise, \a FloatingPoint + * is a typedef to \a T. + * \li An enum value \a IsComplex. It is equal to 1 if \a T is a \c std::complex + * type, and to 0 otherwise. + * \li An enum \a HasFloatingPoint. It is equal to \c 0 if \a T is \c int, + * and to \c 1 otherwise. + */ +template<typename T> struct NumTraits; + +template<> struct NumTraits<int> +{ + typedef int Real; + typedef double FloatingPoint; + enum { + IsComplex = 0, + HasFloatingPoint = 0, + ReadCost = 1, + AddCost = 1, + MulCost = 1 + }; +}; + +template<> struct NumTraits<float> +{ + typedef float Real; + typedef float FloatingPoint; + enum { + IsComplex = 0, + HasFloatingPoint = 1, + ReadCost = 1, + AddCost = 1, + MulCost = 1 + }; +}; + +template<> struct NumTraits<double> +{ + typedef double Real; + typedef double FloatingPoint; + enum { + IsComplex = 0, + HasFloatingPoint = 1, + ReadCost = 1, + AddCost = 1, + MulCost = 1 + }; +}; + +template<typename _Real> struct NumTraits<std::complex<_Real> > +{ + typedef _Real Real; + typedef std::complex<_Real> FloatingPoint; + enum { + IsComplex = 1, + HasFloatingPoint = NumTraits<Real>::HasFloatingPoint, + ReadCost = 2, + AddCost = 2 * NumTraits<Real>::AddCost, + MulCost = 4 * NumTraits<Real>::MulCost + 2 * NumTraits<Real>::AddCost + }; +}; + +template<> struct NumTraits<long long int> +{ + typedef long long int Real; + typedef long double FloatingPoint; + enum { + IsComplex = 0, + HasFloatingPoint = 0, + ReadCost = 1, + AddCost = 1, + MulCost = 1 + }; +}; + +template<> struct NumTraits<long double> +{ + typedef long double Real; + typedef long double FloatingPoint; + enum { + IsComplex = 0, + HasFloatingPoint = 1, + ReadCost = 1, + AddCost = 1, + MulCost = 1 + }; +}; + +template<> struct NumTraits<bool> +{ + typedef bool Real; + typedef float FloatingPoint; + enum { + IsComplex = 0, + HasFloatingPoint = 0, + ReadCost = 1, + AddCost = 1, + MulCost = 1 + }; +}; + +#endif // EIGEN_NUMTRAITS_H |