WignerD.h

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/* YAP - Yet another PWA toolkit
 Copyright 2015, Technische Universitaet Muenchen,
 Authors: Daniel Greenwald, Johannes Rauch

 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 3 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, see <http://www.gnu.org/licenses/>.
 */


#ifndef yap_WignerD_h
#define yap_WignerD_h

#include "Constants.h"

#include <complex>

namespace yap {

const double dFunction(unsigned twoJ, int twoM, int twoN, double beta);

inline const std::complex<double> DFunction(unsigned twoJ, int twoM, int twoN, double alpha, double beta, double gamma)
{ return std::exp(-Complex_i * (alpha * twoM + gamma * twoN) / 2.) * dFunction(twoJ, twoM, twoN, beta); }

namespace dMatrix {

void cache(unsigned int twoJ);

const unsigned cacheSize();

}

}

#endif