Method close

lib/catch2/catch.hpp:12637–12704

                return !!m_generator;
            }
            void close() override {
                TrackerBase::close();
                // If a generator has a child (it is followed by a section)
                // and none of its children have started, then we must wait
                // until later to start consuming its values.
                // This catches cases where `GENERATE` is placed between two
                // `SECTION`s.
                // **The check for m_children.empty cannot be removed**.
                // doing so would break `GENERATE` _not_ followed by `SECTION`s.
                const bool should_wait_for_child = [&]() {
                    // No children -> nobody to wait for
                    if ( m_children.empty() ) {
                        return false;
                    }
                    // If at least one child started executing, don't wait
                    if ( std::find_if(
                             m_children.begin(),
                             m_children.end(),
                             []( TestCaseTracking::ITrackerPtr tracker ) {
                                 return tracker->hasStarted();
                             } ) != m_children.end() ) {
                        return false;
                    }

                    // No children have started. We need to check if they _can_
                    // start, and thus we should wait for them, or they cannot
                    // start (due to filters), and we shouldn't wait for them
                    auto* parent = m_parent;
                    // This is safe: there is always at least one section
                    // tracker in a test case tracking tree
                    while ( !parent->isSectionTracker() ) {
                        parent = &( parent->parent() );
                    }
                    assert( parent &&
                            "Missing root (test case) level section" );

                    auto const& parentSection =
                        static_cast<SectionTracker&>( *parent );
                    auto const& filters = parentSection.getFilters();
                    // No filters -> no restrictions on running sections
                    if ( filters.empty() ) {
                        return true;
                    }

                    for ( auto const& child : m_children ) {
                        if ( child->isSectionTracker() &&
                             std::find( filters.begin(),
                                        filters.end(),
                                        static_cast<SectionTracker&>( *child )
                                            .trimmedName() ) !=
                                 filters.end() ) {
                            return true;
                        }
                    }
                    return false;
                }();

                // This check is a bit tricky, because m_generator->next()