SolverByElementTypeRegistry.h

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#pragma once
 
#include <functional>
#include <memory>
#include <typeindex>
#include <unordered_map>
 
#include "BaseLib/Logging.h"
#include "NumLib/Fem/FiniteElement/ElementTraitsLagrange.h"
 
namespace ApplicationUtils
{
template <typename SolverInterface,
          template <typename ShapeFunction>
          class SolverImplementationTplTpl>
class SolverByElementTypeRegistry final
{
    using SolverIntfPtr = std::unique_ptr<SolverInterface>;
 
    static std::unordered_map<std::type_index, SolverIntfPtr> initSolvers()
    {
        std::unordered_map<std::type_index, SolverIntfPtr> solvers;
 
        auto at_least_1D = []<typename ET>(ET*)
        { return ET::Element::dimension >= 1; };
 
        auto create_and_insert_solver = [&solvers]<typename ET>(ET*)
        {
            using SolverImplementation =
                SolverImplementationTplTpl<typename ET::ShapeFunction>;
 
            solvers[std::type_index(typeid(typename ET::Element))] =
                std::make_unique<SolverImplementation>();
        };
 
        using ElementTraitsFiltered =
            decltype(BaseLib::TMP::filter<NumLib::AllElementTraitsLagrange>(
                at_least_1D));
 
        BaseLib::TMP::foreach<ElementTraitsFiltered>(create_and_insert_solver);
 
        return solvers;
    }
    static std::unordered_map<std::type_index, SolverIntfPtr> initSolvers() {…}
 
    static const std::unordered_map<std::type_index, SolverIntfPtr> solvers_;
 
public:
    static SolverInterface const& getFor(MeshLib::Element const& e)
    {
        auto const type_idx = std::type_index(typeid(e));
        auto const it_type_solver = solvers_.find(type_idx);
 
        if (it_type_solver != solvers_.end())
        {
            return *it_type_solver->second;
        }
        OGS_FATAL(
            "You are trying to get a solver for an unknown mesh element "
            "type "
            "({:s}).",
            type_idx.name());
    }
    static SolverInterface const& getFor(MeshLib::Element const& e) {…}
};
class SolverByElementTypeRegistry final {…};
 
template <typename SolverInterface,
          template <typename /* shp fct */>
          class SolverImplementationTplTpl>
const std::unordered_map<std::type_index, std::unique_ptr<SolverInterface>>
    SolverByElementTypeRegistry<SolverInterface,
                                SolverImplementationTplTpl>::solvers_{
        SolverByElementTypeRegistry<SolverInterface,
                                    SolverImplementationTplTpl>::initSolvers()};
 
}  // namespace ApplicationUtils