sg_size_t size_ = 0;
OpType type_ = OpType::READ;
std::atomic_int_fast32_t refcount_{0};
explicit Io(sg_storage_t storage, sg_size_t size, OpType type);
sg_size_t size_ = 0;
OpType type_ = OpType::READ;
std::atomic_int_fast32_t refcount_{0};
explicit Io(sg_storage_t storage, sg_size_t size, OpType type);