diff options
| -rw-r--r-- | include/llvm/ADT/NullablePtr.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/llvm/ADT/NullablePtr.h b/include/llvm/ADT/NullablePtr.h index 8ddfd5d..e66c1d0 100644 --- a/include/llvm/ADT/NullablePtr.h +++ b/include/llvm/ADT/NullablePtr.h @@ -14,6 +14,7 @@ #ifndef LLVM_ADT_NULLABLEPTR_H #define LLVM_ADT_NULLABLEPTR_H +#include "llvm/Support/type_traits.h" #include <cassert> #include <cstddef> @@ -25,8 +26,17 @@ namespace llvm { template<class T> class NullablePtr { T *Ptr; + struct PlaceHolder {}; + public: NullablePtr(T *P = 0) : Ptr(P) {} + + template<typename OtherT> + NullablePtr(NullablePtr<OtherT> Other, + typename enable_if< + is_base_of<T, OtherT>, + PlaceHolder + >::type = PlaceHolder()) : Ptr(Other.getPtrOrNull()) {} bool isNull() const { return Ptr == 0; } bool isNonNull() const { return Ptr != 0; } |