explicit Io(sg_storage_t storage, sg_size_t size, OpType type);
public:
+#ifndef DOXYGEN
friend XBT_PUBLIC void intrusive_ptr_release(simgrid::s4u::Io* i);
friend XBT_PUBLIC void intrusive_ptr_add_ref(simgrid::s4u::Io* i);
friend Storage; // Factory of IOs
+#endif
~Io() = default;