[llvm] 2529de5 - [ADT] Deprecate ArrayRef(std::nullopt) (#146011)

[via llvm-commits]

Author: Kazu Hirata
Date: 2025-06-27T01:03:02-07:00
New Revision: 2529de5c935ad59e5f76d15890f857bf42817bc9

URL: https://github.com/llvm/llvm-project/commit/2529de5c935ad59e5f76d15890f857bf42817bc9
DIFF: https://github.com/llvm/llvm-project/commit/2529de5c935ad59e5f76d15890f857bf42817bc9.diff

LOG: [ADT] Deprecate ArrayRef(std::nullopt) (#146011)

Since the use of std::nullopt outside the context of std::optional is
kind of abuse and not intuitive to new comers, this patch deprecates
the constructor.  All known uses within the LLVM codebase have been
migrated to other constructors.

Added: 
    

Modified: 
    llvm/include/llvm/ADT/ArrayRef.h

Removed: 
    


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diff  --git a/llvm/include/llvm/ADT/ArrayRef.h b/llvm/include/llvm/ADT/ArrayRef.h
index 892482d64e4a1..9305af8e40502 100644
--- a/llvm/include/llvm/ADT/ArrayRef.h
+++ b/llvm/include/llvm/ADT/ArrayRef.h
@@ -67,7 +67,8 @@ namespace llvm {
     /*implicit*/ ArrayRef() = default;
 
     /// Construct an empty ArrayRef from std::nullopt.
-    /*implicit*/ ArrayRef(std::nullopt_t) {}
+    /*implicit*/ LLVM_DEPRECATED("Use {} or ArrayRef<T>() instead", "{}")
+    ArrayRef(std::nullopt_t) {}
 
     /// Construct an ArrayRef from a single element.
     /*implicit*/ ArrayRef(const T &OneElt LLVM_LIFETIME_BOUND)