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[ADT/NullablePtr] Allow implicit conversion of NullablePtr<OtherT> -> NullablePtr<T> if OtherT is derived from T.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185851 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Argyrios Kyrtzidis 2013-07-08 19:12:01 +00:00
parent ca4ed882f4
commit 7426a3b588
1 changed files with 10 additions and 0 deletions
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10
include/llvm/ADT/NullablePtr.h
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@ -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; }