BaseMatrixPrimitiveIntegralEngine.hpp

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// This file is part of GQCG-GQCP.
//
// Copyright (C) 2017-2020  the GQCG developers
//
// GQCG-GQCP 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.
//
// GQCG-GQCP 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 for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with GQCG-GQCP.  If not, see <http://www.gnu.org/licenses/>.
 
#pragma once
 
 
#include "Mathematical/Functions/DyadicCartesianDirection.hpp"
 
#include <cstddef>
 
 
namespace GQCP {
 
 
class BaseMatrixPrimitiveIntegralEngine {
protected:
    // The component over which the primitive engine is prepared to calculate integrals.
    DyadicCartesianDirection component;
 
 
public:
    /*
     *  MARK: Constructors
     */
 
    BaseMatrixPrimitiveIntegralEngine(const DyadicCartesianDirection component = DyadicCartesianDirection::xx);
 
 
    /*
     *  MARK: Destructor
     */
 
    virtual ~BaseMatrixPrimitiveIntegralEngine() = 0;
 
 
    /*
     *  MARK: Components
     */
 
    // The number of components the operator has. For a scalar operator, this is equal to 9.
    static constexpr size_t Components = 9;
 
    void prepareStateForComponent(const size_t component);
};
 
 
}  // namespace GQCP