ReflectionSetIPData.h

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#pragma once
 
#include <Eigen/Core>
#include <vector>
 
#include "MathLib/KelvinVector.h"
#include "ReflectionIPData.h"
 
namespace ProcessLib::Reflection
{
namespace detail
{
template <int dim, typename IPData, typename Accessor>
void setIPData(double const* values,
               std::vector<IPData>& ip_data_vector,
               Accessor const& accessor)
{
    using AccessorResult = std::invoke_result_t<Accessor, IPData&>;
    using AccessorResultStripped = std::remove_cvref_t<AccessorResult>;
 
    static_assert(is_raw_data_v<AccessorResultStripped>,
                  "This method only deals with raw data. The given "
                  "AccessorResultStripped is not raw data.");
 
    constexpr auto num_comp = NumberOfComponents<AccessorResultStripped>::value;
 
    auto const num_int_pts = ip_data_vector.size();
 
    if constexpr (num_comp == 1)
    {
        // scalar
        for (unsigned ip = 0; ip < num_int_pts; ++ip)
        {
            accessor(ip_data_vector[ip]) = values[ip];
        }
    }
    else
    {
        constexpr auto num_rows = NumberOfRows<AccessorResultStripped>::value;
        constexpr auto num_cols =
            NumberOfColumns<AccessorResultStripped>::value;
        constexpr auto kv_size =
            MathLib::KelvinVector::kelvin_vector_dimensions(dim);
 
        auto const values_mat =
            Eigen::Map<Eigen::Matrix<double, num_comp, Eigen::Dynamic,
                                     Eigen::ColMajor> const>(values, num_comp,
                                                             num_int_pts);
 
        for (unsigned ip = 0; ip < num_int_pts; ++ip)
        {
            if constexpr (num_cols == 1 || num_rows == 1)
            {
                // vector
                if constexpr (num_comp == kv_size)
                {
                    // Kelvin vector
                    accessor(ip_data_vector[ip]) =
                        MathLib::KelvinVector::symmetricTensorToKelvinVector(
                            values_mat.col(ip));
                }
                else
                {
                    // other vector
                    accessor(ip_data_vector[ip]) = values_mat.col(ip);
                }
            }
            else
            {
                // matrix
                accessor(ip_data_vector[ip]) =
                    values_mat.col(ip).template reshaped<Eigen::RowMajor>(
                        num_rows, num_cols);
            }
        }
    }
}
 
// Sets IP data if the passed name equals the one in refl_data.
// Returns true if IP have been set, false otherwise.
template <int dim, typename IPData, typename Accessor_CurrentLevelFromIPData,
          typename Class, typename Accessor>
bool setIPDataIfNameMatches(std::string_view const name, double const* values,
                            std::vector<IPData>& ip_data_vector,
                            Accessor_CurrentLevelFromIPData const& accessor,
                            ReflectionData<Class, Accessor> const& refl_data)
{
    auto const accessor_next_level = refl_data.accessor;
 
    using MemberRef = std::invoke_result_t<Accessor, Class&>;
    using Member = std::remove_cvref_t<MemberRef>;
 
    auto const accessor_field_from_ip_data =
        [accessor, accessor_next_level](IPData& ip_data) -> Member&
    { return accessor_next_level(accessor(ip_data)); };
 
    if constexpr (detail::is_reflectable<Member>)
    {
        return reflectSetIPData<dim>(
            name, values, ip_data_vector, accessor_field_from_ip_data,
            detail::reflect(std::type_identity<Member>{}));
    }
    else
    {
        static_assert(detail::is_raw_data_v<Member>,
                      "The current member is not reflectable, so we "
                      "expect it to be raw data.");
 
        if (refl_data.name != name)
        {
            return false;
        }
 
        setIPData<dim>(values, ip_data_vector, accessor_field_from_ip_data);
 
        return true;
    }
}
 
template <int dim, typename IPData, typename Accessor_CurrentLevelFromIPData,
          typename... Classes, typename... Accessors, std::size_t... Idcs>
bool reflectSetIPData(
    std::string_view const name, double const* values,
    std::vector<IPData>& ip_data_vector,
    Accessor_CurrentLevelFromIPData const& accessor,
    std::tuple<ReflectionData<Classes, Accessors>...> const& refl_data,
    std::index_sequence<Idcs...>)
{
    // uses short-circuit evaluation of the fold || ... to stop after the first
    // match
    return ((setIPDataIfNameMatches<dim>(name, values, ip_data_vector, accessor,
                                         std::get<Idcs>(refl_data))) ||
            ...);
}
 
template <int dim, typename IPData, typename Accessor_CurrentLevelFromIPData,
          typename... Classes, typename... Accessors>
bool reflectSetIPData(
    std::string_view const name, double const* values,
    std::vector<IPData>& ip_data_vector,
    Accessor_CurrentLevelFromIPData const& accessor,
    std::tuple<ReflectionData<Classes, Accessors>...> const& refl_data)
{
    return reflectSetIPData<dim>(
        name, values, ip_data_vector, accessor, refl_data,
        std::make_index_sequence<sizeof...(Classes)>{});
}
}  // namespace detail
 
template <int dim, typename IPData>
std::size_t reflectSetIPData(std::string_view const name, double const* values,
                             std::vector<IPData>& ip_data_vector)
{
    detail::reflectSetIPData<dim>(
        name, values, ip_data_vector, std::identity{},
        detail::reflect(std::type_identity<IPData>{}));
 
    return ip_data_vector.size();
}
 
}  // namespace ProcessLib::Reflection