combined.hpp

// SPDX-FileCopyrightText: 2017 - 2024 The Ginkgo authors
//
// SPDX-License-Identifier: BSD-3-Clause
 
#ifndef GKO_PUBLIC_CORE_STOP_COMBINED_HPP_
#define GKO_PUBLIC_CORE_STOP_COMBINED_HPP_
 
 
#include <vector>
 
 
#include <ginkgo/core/stop/criterion.hpp>
 
 
namespace gko {
namespace stop {
 
 
class Combined : public EnablePolymorphicObject<Combined, Criterion> {
    friend class EnablePolymorphicObject<Combined, Criterion>;
 
public:
    class Factory;
 
    struct parameters_type
        : public ::gko::enable_parameters_type<parameters_type, Factory> {
        std::vector<std::shared_ptr<const CriterionFactory>>
            GKO_DEFERRED_FACTORY_VECTOR_PARAMETER(criteria);
    };
 
    class Factory
        : public ::gko::stop::EnableDefaultCriterionFactory<Factory, Combined,
                                                            parameters_type> {
        friend class ::gko::EnablePolymorphicObject<
            Factory, ::gko::stop::CriterionFactory>;
        friend class ::gko::enable_parameters_type<parameters_type, Factory>;
 
        using Base =
            ::gko::stop::EnableDefaultCriterionFactory<Factory, Combined,
                                                       parameters_type>;
 
    public:
        explicit Factory(std::shared_ptr<const ::gko::Executor> exec);
        explicit Factory(std::shared_ptr<const ::gko::Executor> exec,
                         const parameters_type& parameters);
 
        Factory(const Factory& other) = default;
        Factory(Factory&& other) = default;
 
        Factory& operator=(const Factory& other);
    };
 
    static parameters_type build() { return {}; }
 
    const parameters_type& get_parameters() const { return parameters_; }
 
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);
 
    explicit Combined(const Factory* factory, const CriterionArgs& args);
 
private:
    friend ::gko::stop::EnableDefaultCriterionFactory<Factory, Combined,
                                                      parameters_type>;
 
    parameters_type parameters_;
 
    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);
    case 1:
        if (factories[0] == nullptr) {
            GKO_NOT_SUPPORTED(nullptr);
        }
        return factories[0];
    default:
        if (factories[0] == nullptr) {
            // first factory must be valid to capture executor
            GKO_NOT_SUPPORTED(nullptr);
        } else {
            auto exec = factories[0]->get_executor();
            return Combined::build()
                .with_criteria(std::forward<FactoryContainer>(factories))
                .on(exec);
        }
    }
}
 
 
}  // namespace stop
}  // namespace gko
 
 
#endif  // GKO_PUBLIC_CORE_STOP_COMBINED_HPP_