Function.h

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#pragma once
 
#include <exprtk.hpp>
#include <utility>
#include <vector>
 
#include "MaterialLib/MPL/Property.h"
#include "MaterialLib/MPL/VariableType.h"
 
namespace MaterialPropertyLib
{
class Function final : public Property
{
public:
    Function(
        std::string name,
        std::vector<std::string> const& value_string_expressions,
        std::vector<std::pair<std::string, std::vector<std::string>>> const&
            dvalue_string_expressions);
 
    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;
 
private:
    using Expression = exprtk::expression<double>;
 
    std::vector<std::pair<Variable, double*>> symbol_values_;
    std::vector<Expression> value_expressions_;
    std::vector<std::pair<Variable, std::vector<Expression>>>
        dvalue_expressions_;
 
    mutable std::mutex mutex_;
};
}  // namespace MaterialPropertyLib