Exponential.h

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// SPDX-FileCopyrightText: Copyright (c) OpenGeoSys Community (opengeosys.org)
// SPDX-License-Identifier: BSD-3-Clause
 
#pragma once
 
#include "MaterialLib/MPL/Property.h"
#include "MaterialLib/MPL/VariableType.h"
 
namespace MaterialPropertyLib
{
using StringOrVariable = std::variant<std::string, Variable>;
struct ExponentData
{
    StringOrVariable type;
    VariableType
        reference_condition;  
    VariableType factor;      
};

class Exponential final : public Property
{
public:
    Exponential(std::string name,
                double const offset,
                PropertyDataType const& property_reference_value,
                ExponentData const& v);
    PropertyDataType value(VariableArray const& variable_array,
                           ParameterLib::SpatialPosition const& pos,
                           double const t, double const dt) const override;
    PropertyDataType dValue(VariableArray const& variable_array,
                            Variable const variable,
                            ParameterLib::SpatialPosition const& /*pos*/,
                            double const /*t*/,
                            double const /*dt*/) const override;
    PropertyDataType d2Value(VariableArray const& variable_array,
                             Variable const pv1, Variable const pv2,
                             ParameterLib::SpatialPosition const& /*pos*/,
                             double const /*t*/,
                             double const /*dt*/) const override;
 
private:
    ExponentData const exponent_data_;
    double const offset_;  
};
}  // namespace MaterialPropertyLib