Rewrite planemap and idalloc in pure C++

luprex/syscpp/world.hpp

@@ -0,0 +1,31 @@
+// Note about header file dependencies:
+//
+//    world.hpp contains a lot of forward declarations.
+//    That's because it is at the bottom of the dependency stack:
+//    everyone includes world.hpp.
+//
+//    However, world.cpp is at the top of the dependency stack,
+//    it includes everyone else.
+//
+
+#ifndef WORLD_HPP
+#define WORLD_HPP
+
+#include "luastack.hpp"
+#include <memory>
+
+class IdGlobalPool;
+
+class World {
+public:
+    int id_;
+    std::unique_ptr<IdGlobalPool> id_pool_;
+    
+    World() : id_(0) {};
+    ~World();
+
+    static void init(lua_State *L);
+    static World *fetch(lua_State *L);
+};
+
+#endif // WORLD_HPP