[llvm-branch-commits] [clang] [clang-tools-extra] [libcxx] [clang] improved preservation of template keyword (PR #133610)

[Younan Zhang via llvm-branch-commits]

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@@ -544,6 +545,35 @@ class QualifiedTemplateName : public llvm::FoldingSetNode {
   }
 };
 
+struct IdentifierOrOverloadedOperator {
+  IdentifierOrOverloadedOperator() = default;
+  IdentifierOrOverloadedOperator(const IdentifierInfo *II);
+  IdentifierOrOverloadedOperator(OverloadedOperatorKind OOK);
+
+  /// Returns the identifier to which this template name refers.
+  const IdentifierInfo *getIdentifier() const {
+    if (getOperator() != OO_None)
+      return nullptr;
+    return reinterpret_cast<const IdentifierInfo *>(PtrOrOp);
+  }
+
+  /// Return the overloaded operator to which this template name refers.
+  OverloadedOperatorKind getOperator() const {
+    uintptr_t OOK = -PtrOrOp;
+    return OOK < NUM_OVERLOADED_OPERATORS ? OverloadedOperatorKind(OOK)
+                                          : OO_None;
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zyn0217 wrote:

IIRC this pointer/integer mechanism is also used in that lambda patch. We probably want to extract a generic implementation of it.

https://github.com/llvm/llvm-project/pull/133610