FEAST.h

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/*******************************************************************************
 * Copyright (C) 2017-2026 Theodore Chang
 *
 * 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 FEAST_H
#define FEAST_H
 
#include <Solver/Solver.h>
 
template<sp_d T> class Factory;
using LongFactory = Factory<double>;
 
class FEAST final : public Solver {
    static constexpr char UPLO = 'F';
 
    const bool quadratic = false;
 
    const unsigned eigen_num;
    const double centre, radius;
 
    [[nodiscard]] int linear_solve(const shared_ptr<LongFactory>&) const;
    [[nodiscard]] int quadratic_solve(const shared_ptr<LongFactory>&) const;
 
public:
    FEAST(unsigned, unsigned, double, double, bool);
 
    int initialize() override;
 
    int analyze() override;
 
    void print() override;
};
 
#endif