-/*************
- * Callbacks *
- *************/
-
-/** @ingroup SURF_callbacks
- * @brief Callbacks handler which emit the callbacks after StorageAction State changed *
- * @details Callback functions have the following signature: `void(StorageAction *action,
- * simgrid::kernel::resource::Action::State old, simgrid::kernel::resource::Action::State current)`
- */
-XBT_PUBLIC_DATA
-simgrid::xbt::signal<void(StorageAction*, kernel::resource::Action::State, kernel::resource::Action::State)>
- on_state_change;