ExactDiagonalizer.h

/* Copyright 2016 Kristofer Björnson
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
 
#ifndef COM_DAFER45_TBTK_SOLVER_EXACT_DIAGONALIZATION
#define COM_DAFER45_TBTK_SOLVER_EXACT_DIAGONALIZATION
 
#include "TBTK/Solver/Diagonalizer.h"
#include "TBTK/FockStateRuleSet.h"
#include "TBTK/FockStateRule/WrapperRule.h"
#include "TBTK/InteractionAmplitudeSet.h"
#include "TBTK/Model.h"
#include "TBTK/ManyParticleContext.h"
#include "TBTK/Solver/Solver.h"
 
#include <initializer_list>
 
namespace TBTK{
namespace Solver{
 
class ExactDiagonalizer : public Solver{
public:
    ExactDiagonalizer(
//      Model *model
    );
 
    virtual ~ExactDiagonalizer();
 
    unsigned int addSubspace(std::initializer_list<const FockStateRule::WrapperRule> rules);
 
    unsigned int addSubspace(std::vector<FockStateRule::WrapperRule> rules);
 
    unsigned int addSubspace(const FockStateRuleSet &rules);
 
    void run(unsigned int subspace);
 
    const CArray<double>& getEigenValues(unsigned int subspace);
 
    const double getEigenValue(unsigned int subspace, int state);
 
    const std::complex<double> getAmplitude(
        unsigned int subspace,
        int state,
        const Index &index
    );
 
//  Model* getModel();
private:
//  Model *model;
 
    class SubspaceContext{
    public:
        SubspaceContext(
            std::initializer_list<const FockStateRule::WrapperRule> rules
        );
 
        SubspaceContext(
            std::vector<FockStateRule::WrapperRule> rules
        );
 
        SubspaceContext(
            const FockStateRuleSet &rules
        );
 
        ~SubspaceContext();
 
//      std::vector<FockStateRule::WrapperRule> rules;
        FockStateRuleSet fockStateRuleSet;
 
//      Model *manyParticleModel;
        std::shared_ptr<Model> manyParticleModel;
 
//      Diagonalizer *dSolver;
        std::shared_ptr<Diagonalizer> dSolver;
    private:
    };
 
    std::vector<SubspaceContext> subspaceContexts;
 
    void setupManyParticleModel(unsigned int subspace);
 
    template<typename BIT_REGISTER>
    void setupManyParticleModel(unsigned int subspace);
};
 
inline const CArray<double>& ExactDiagonalizer::getEigenValues(
    unsigned int subspace
){
    return subspaceContexts.at(subspace).dSolver->getEigenValues();
}
 
inline const double ExactDiagonalizer::getEigenValue(
    unsigned int subspace,
    int state
){
    return subspaceContexts.at(subspace).dSolver->getEigenValue(state);
}
 
inline const std::complex<double> ExactDiagonalizer::getAmplitude(
    unsigned int subspace,
    int state,
    const Index &index
){
    return subspaceContexts.at(subspace).dSolver->getAmplitude(
        state,
        index
    );
}
 
/*inline Model* ExactDiagonalizer::getModel(){
    return model;
}*/
 
};  //End of namespace Solver
};  //End of namespace TBTK
 
#endif