From e68f1412e2cebdd5af106721007335ca45d51f83 Mon Sep 17 00:00:00 2001
From: Abseil Team <absl-team@google.com>
Date: Fri, 15 Sep 2023 08:14:33 -0700
Subject: Allow const qualified FunctionRef instances. This allows the
 signature to be compatible with AnyInvokable for const uses.

PiperOrigin-RevId: 565682320
Change-Id: I924dadf110481e572bdb8af0111fa62d6f553d90
---
 absl/functional/function_ref.h | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'absl/functional/function_ref.h')

diff --git a/absl/functional/function_ref.h b/absl/functional/function_ref.h
index 2b9139d3..96cece55 100644
--- a/absl/functional/function_ref.h
+++ b/absl/functional/function_ref.h
@@ -137,6 +137,14 @@ class FunctionRef<R(Args...)> {
   absl::functional_internal::Invoker<R, Args...> invoker_;
 };
 
+// Allow const qualified function signatures. Since FunctionRef requires
+// constness anyway we can just make this a no-op.
+template <typename R, typename... Args>
+class FunctionRef<R(Args...) const> : public FunctionRef<R(Args...)> {
+ public:
+  using FunctionRef<R(Args...)>::FunctionRef;
+};
+
 ABSL_NAMESPACE_END
 }  // namespace absl
 
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