[llvm-branch-commits] [clang] [llvm] [HLSL][RootSignature] Define and integrate rootsig clang attr and decl (PR #137690)

[Justin Bogner via llvm-branch-commits]

================
@@ -149,6 +149,29 @@ void DescriptorTableClause::dump(raw_ostream &OS) const {
   OS << ")";
 }
 
+// Helper struct so that we can use the overloaded notation of std::visit
+template <class... Ts> struct OverloadMethods : Ts... {
+  using Ts::operator()...;
+};
+
+template <class... Ts> OverloadMethods(Ts...) -> OverloadMethods<Ts...>;
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bogner wrote:

I feel like it'd be simpler to just define a callable with a templated `operator()`:
```c++
namespace {
struct ElementDumper {
  raw_ostream &OS;
  template <typename T> void operator()(const T &Element) const {
    Element.dump(OS);
  }
};
}
```
Then we just need `std::visit(ElementDumper{OS}, Element)` later.

https://github.com/llvm/llvm-project/pull/137690