Function GetLinkGraphJobDesc

src/saveload/linkgraph_sl.cpp:180–213

* Get a SaveLoad array for a link graph job. The settings struct is derived from * the global settings saveload array. The exact entries are calculated when the function * is called the first time. * It's necessary to keep a copy of the settings for each link graph job so that you can * change the settings while in-game and still not mess with current link graph runs. * Of course the settings

 * @return Array of SaveLoad structs.
 */
SaveLoadTable GetLinkGraphJobDesc()
{
	static std::vector<SaveLoad> saveloads;

	static const SaveLoad job_desc[] = {
		SLE_VAR(LinkGraphJob, join_date,        SLE_INT32),
		SLE_VAR(LinkGraphJob, link_graph.index, SLE_UINT16),
		SLEG_STRUCT("linkgraph", SlLinkgraphJobProxy),
	};

	/* The member offset arithmetic below is only valid if the types in question
	 * are standard layout types. Otherwise, it would be undefined behaviour. */
	static_assert(std::is_standard_layout<LinkGraphSettings>::value, "LinkGraphSettings needs to be a standard layout type");

	/* We store the offset of each member of the #LinkGraphSettings in the
	 * extra data of the saveload struct. Use it together with the address
	 * of the settings struct inside the job to find the final memory address. */
	static SaveLoadAddrProc * const proc = [](void *b, size_t extra) -> void * { return const_cast<void *>(static_cast<const void *>(reinterpret_cast<const char *>(std::addressof(static_cast<LinkGraphJob *>(b)->settings)) + extra)); };

	/* Build the SaveLoad array on first call and don't touch it later on */
	if (saveloads.empty()) {
		GetSaveLoadFromSettingTable(_linkgraph_settings, saveloads);

		for (auto &sl : saveloads) {
			sl.address_proc = proc;
		}

		for (auto &sld : job_desc) {
			saveloads.push_back(sld);
		}
	}

	return saveloads;
}

/**
 * Get a SaveLoad array for the link graph schedule.