VariableType.h

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#pragma once
 
#include <Eigen/Dense>
#include <array>
#include <string>
#include <variant>
 
namespace MaterialPropertyLib
{
using Pair = std::array<double, 2>;
 
using Vector = std::array<double, 3>;
 
using SymmTensor = std::array<double, 6>;
 
using Tensor2d = std::array<double, 4>;
 
using Tensor = std::array<double, 9>;
 
enum class Variable : int
{
    capillary_pressure,
    concentration,
    density,
    displacement,
    effective_pore_pressure,
    enthalpy_of_evaporation,
    equivalent_plastic_strain,
    grain_compressibility,
    liquid_phase_pressure,
    liquid_saturation,
    mechanical_strain,
    molar_mass,
    molar_fraction,
    phase_pressure,
    porosity,
    solid_grain_pressure,
    stress,
    temperature,
    total_strain,
    total_stress,
    transport_porosity,
    vapour_pressure,
    volumetric_strain,
    number_of_variables
};
 
static const std::array<std::string,
                        static_cast<int>(Variable::number_of_variables)>
    variable_enum_to_string{{"capillary_pressure",
                             "concentration",
                             "density",
                             "displacement",
                             "effective_pore_pressure",
                             "enthalpy_of_evaporation",
                             "equivalent_plastic_strain",
                             "grain_compressibility",
                             "liquid_phase_pressure",
                             "liquid_saturation",
                             "mechanical_strain",
                             "molar_mass",
                             "molar_fraction",
                             "phase_pressure",
                             "porosity",
                             "solid_grain_pressure",
                             "stress",
                             "temperature",
                             "total_strain",
                             "total_stress",
                             "transport_porosity",
                             "vapour_pressure",
                             "volumetric_strain"}};
 
using VariableType =
    std::variant<std::monostate, double, Vector, Eigen::Matrix<double, 4, 1>,
                 Eigen::Matrix<double, 6, 1>>;
 
using VariableArray =
    std::array<VariableType, static_cast<int>(Variable::number_of_variables)>;
 
Variable convertStringToVariable(std::string const& string);
}  // namespace MaterialPropertyLib