/usr/include/madness/mra/power.h is in libmadness-dev 0.10-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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This file is part of MADNESS.
Copyright (C) 2007,2010 Oak Ridge National Laboratory
This program is free software; 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.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
For more information please contact:
Robert J. Harrison
Oak Ridge National Laboratory
One Bethel Valley Road
P.O. Box 2008, MS-6367
email: harrisonrj@ornl.gov
tel: 865-241-3937
fax: 865-572-0680
$Id$
*/
#ifndef MADNESS_MRA_POWER_H__INCLUDED
#define MADNESS_MRA_POWER_H__INCLUDED
namespace madness {
template <int D>
inline int power(int base = 2) {
return (int) std::pow((double) base, (int) D);
}
template <>
inline int power<0>(int base) {
return 1;
}
template <>
inline int power<1>(int base) {
return base;
}
template <>
inline int power<2>(int base) {
return (int)(base*base);
}
template <>
inline int power<3>(int base) {
return (int)(base*base*base);
}
template <>
inline int power<4>(int base) {
return power<2>(power<2>(base));
}
template <>
inline int power<5>(int base) {
return (power<2>(base)*power<3>(base));
}
template <>
inline int power<6>(int base) {
return power<2>(power<3>(base));
}
template <>
inline int power<7>(int base) {
return (power<4>(base)*power<3>(base));
}
template <>
inline int power<8>(int base) {
return (power<2>(power<4>(base)));
}
template <>
inline int power<9>(int base) {
return (power<3>(power<3>(base)));
}
template <>
inline int power<10>(int base) {
return (power<2>(power<5>(base)));
}
template <>
inline int power<12>(int base) {
return (power<3>(power<4>(base)));
}
// Florian: following code from the internet (stackoverflow)
namespace detail {
template<class T, int N>
struct helper {
static T pow(const T x){
return helper<T, N-1>::pow(x) * x;
}
};
template<class T>
struct helper<T, 1> {
static T pow(const T x){
return x;
}
};
template<class T>
struct helper<T, 0> {
static T pow(const T x){
return 1;
}
};
}
template<int N, class T>
T power(T const x) {
return detail::helper<T, N>::pow(x);
}
}
#endif
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