196c196
< * NULL pointer is returned. This has all the implications of a cache
---
> * nullptr is returned. This has all the implications of a cache
218c218
< if (blk != NULL) {
---
> if (blk != nullptr) {
225c225
< if (blk != NULL) {
---
> if (blk != nullptr) {
256c256
< BlkType *blk = NULL;
---
> BlkType *blk = nullptr;