combined.hpp

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#ifndef GKO_CORE_STOP_COMBINED_HPP_
#define GKO_CORE_STOP_COMBINED_HPP_


#include <ginkgo/core/stop/criterion.hpp>


#include <vector>


namespace gko {
namespace stop {


class Combined : public EnablePolymorphicObject<Combined, Criterion> {
    friend class EnablePolymorphicObject<Combined, Criterion>;

public:
    GKO_CREATE_FACTORY_PARAMETERS(parameters, Factory)
    {
        std::vector<std::shared_ptr<const CriterionFactory>>
            GKO_FACTORY_PARAMETER(criteria, nullptr);
    };
    GKO_ENABLE_CRITERION_FACTORY(Combined, parameters, Factory);
    GKO_ENABLE_BUILD_METHOD(Factory);

protected:
    bool check_impl(uint8 stoppingId, bool setFinalized,
                    Array<stopping_status> *stop_status, bool *one_changed,
                    const Updater &) override;

    explicit Combined(std::shared_ptr<const gko::Executor> exec)
        : EnablePolymorphicObject<Combined, Criterion>(std::move(exec))
    {}

    explicit Combined(const Factory *factory, const CriterionArgs &args)
        : EnablePolymorphicObject<Combined, Criterion>(factory->get_executor()),
          parameters_{factory->get_parameters()}
    {
        for (const auto &f : parameters_.criteria) {
            criteria_.push_back(f->generate(args));
        }
    }

private:
    std::vector<std::unique_ptr<Criterion>> criteria_{};
};


template <typename FactoryContainer>
std::shared_ptr<const CriterionFactory> combine(FactoryContainer &&factories)
{
    switch (factories.size()) {
    case 0:
        GKO_NOT_SUPPORTED(nullptr);
        return nullptr;
    case 1:
        return factories[0];
    default:
        auto exec = factories[0]->get_executor();
        return Combined::build()
            .with_criteria(std::forward<FactoryContainer>(factories))
            .on(exec);
    }
}


}  // namespace stop
}  // namespace gko


#endif  // GKO_CORE_STOP_COMBINED_HPP_