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[ADT/NullablePtr] Allow implicit conversion of NullablePtr<OtherT> -> NullablePtr<T> if OtherT is derived from T.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185851 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -14,6 +14,7 @@
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#ifndef LLVM_ADT_NULLABLEPTR_H
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#define LLVM_ADT_NULLABLEPTR_H
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#include "llvm/Support/type_traits.h"
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#include <cassert>
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#include <cstddef>
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@ -25,8 +26,17 @@ namespace llvm {
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template<class T>
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class NullablePtr {
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T *Ptr;
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struct PlaceHolder {};
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public:
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NullablePtr(T *P = 0) : Ptr(P) {}
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template<typename OtherT>
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NullablePtr(NullablePtr<OtherT> Other,
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typename enable_if<
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is_base_of<T, OtherT>,
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PlaceHolder
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>::type = PlaceHolder()) : Ptr(Other.getPtrOrNull()) {}
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bool isNull() const { return Ptr == 0; }
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bool isNonNull() const { return Ptr != 0; }
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