Class GeneratorTracker

tests/catch.hpp:10017–10067

    namespace Generators {
        struct GeneratorTracker : TestCaseTracking::TrackerBase, IGeneratorTracker {
            GeneratorBasePtr m_generator;

            GeneratorTracker( TestCaseTracking::NameAndLocation const& nameAndLocation, TrackerContext& ctx, ITracker* parent )
            :   TrackerBase( nameAndLocation, ctx, parent )
            {}
            ~GeneratorTracker();

            static GeneratorTracker& acquire( TrackerContext& ctx, TestCaseTracking::NameAndLocation const& nameAndLocation ) {
                std::shared_ptr<GeneratorTracker> tracker;

                ITracker& currentTracker = ctx.currentTracker();
                if( TestCaseTracking::ITrackerPtr childTracker = currentTracker.findChild( nameAndLocation ) ) {
                    assert( childTracker );
                    assert( childTracker->isGeneratorTracker() );
                    tracker = std::static_pointer_cast<GeneratorTracker>( childTracker );
                }
                else {
                    tracker = std::make_shared<GeneratorTracker>( nameAndLocation, ctx, &currentTracker );
                    currentTracker.addChild( tracker );
                }

                if( !ctx.completedCycle() && !tracker->isComplete() ) {
                    tracker->open();
                }

                return *tracker;
            }

            // TrackerBase interface
            bool isGeneratorTracker() const override { return true; }
            auto hasGenerator() const -> bool override {
                return !!m_generator;
            }
            void close() override {
                TrackerBase::close();
                // Generator interface only finds out if it has another item on atual move
                if (m_runState == CompletedSuccessfully && m_generator->next()) {
                    m_children.clear();
                    m_runState = Executing;
                }
            }

            // IGeneratorTracker interface
            auto getGenerator() const -> GeneratorBasePtr const& override {
                return m_generator;
            }
            void setGenerator( GeneratorBasePtr&& generator ) override {
                m_generator = std::move( generator );
            }
        };
        GeneratorTracker::~GeneratorTracker() {}
    }