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// 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@math.jussieu.fr>
//
// 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>.
*
* 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 = 3
};
};
template<> struct NumTraits<float>
{
typedef float Real;
typedef float FloatingPoint;
enum {
IsComplex = 0,
HasFloatingPoint = 1,
ReadCost = 1,
AddCost = 2,
MulCost = 6
};
};
template<> struct NumTraits<double>
{
typedef double Real;
typedef double FloatingPoint;
enum {
IsComplex = 0,
HasFloatingPoint = 1,
ReadCost = 1,
AddCost = 2,
MulCost = 6
};
};
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 = 2,
MulCost = 6
};
};
template<> struct NumTraits<long double>
{
typedef long double Real;
typedef long double FloatingPoint;
enum {
IsComplex = 0,
HasFloatingPoint = 1,
ReadCost = 1,
AddCost = 2,
MulCost = 6
};
};
#endif // EIGEN_NUMTRAITS_H
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