[PATCH] D125590: [LLVM][Casting.h] Add trivial self-cast

[Aman LaChapelle via Phabricator via llvm-commits]

bzcheeseman created this revision.
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Casting from a type to itself should always be possible. Make this simple for all users. Ref: https://reviews.llvm.org/D125543


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D125590

Files:
  llvm/include/llvm/Support/Casting.h


Index: llvm/include/llvm/Support/Casting.h
===================================================================
--- llvm/include/llvm/Support/Casting.h
+++ llvm/include/llvm/Support/Casting.h
@@ -525,6 +525,13 @@
   }
 };
 
+template <typename T> struct CastInfo<T, T> {
+  static bool isPossible(const T &t) { return true; }
+  static decltype(auto) doCast(const T &t) { return t; }
+  static decltype(auto) castFailed() { return T(nullptr); }
+  static decltype(auto) doCastIfPossible(const T &t) { return t; }
+};
+
 //===----------------------------------------------------------------------===//
 // Pre-specialized CastInfo
 //===----------------------------------------------------------------------===//


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