base.hpp

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// OpenBEM - Copyright (C) 2026 Shashwat Sharma
 
// This file is part of OpenBEM.
 
// OpenBEM 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.
 
// You should have received a copy of the GNU General Public License along with OpenBEM.
// If not, see <https://www.gnu.org/licenses/>.
 
 
#ifndef TRI_QUAD_BASE_H
#define TRI_QUAD_BASE_H
 
#include <stdexcept>
#include <string>
#include <functional>
 
#include "types.hpp"
#include "constants.hpp"
 
 
namespace bem
{
 
const uint8_t TRI_DEFAULT_ORDER = 4;
const uint8_t TRI_MAX_ORDER = 30;
 
template <uint8_t dim>
class TriangleQuadratureBase
{
 
    static_assert((dim == 2 || dim == 3), "`dim` must be 2 or 3.");
 
public:
 
    virtual void compute_points_weights(
        const Triangle<dim>& tri,
        std::function<EigRowVec<Complex> (ConstEigRef<EigMatNX<Float, dim>>)> eval = {}
        ) = 0;
 
 
    virtual void set_order(const uint8_t order) { order_ = order; return; };
 
 
    uint8_t order() const { return order_; };
 
 
    const EigMatNX<Float, dim>& points() const
    {
        if (!points_weights_computed_)
            throw std::runtime_error(
                "TriangleQuadratureBase::points(): must call `compute_points_weights()` first.");
        return points_;
    };
 
 
    const EigRowVec<Float>& weights() const
    {
        if (!points_weights_computed_)
            throw std::runtime_error(
                "TriangleQuadratureBase::weights(): must call `compute_points_weights()` first.");
        return weights_;
    };
 
 
protected:
 
    EigMatNX<Float, dim> points_;
    EigRowVec<Float> weights_;
    uint8_t order_ = TRI_DEFAULT_ORDER;
    bool points_weights_computed_ = false;
 
};
 
}
 
#endif