From dc127f39a787a2919a5aa90b75b85753ae64c012 Mon Sep 17 00:00:00 2001
From: Max Kellermann <max.kellermann@gmail.com>
Date: Mon, 22 May 2023 15:01:00 +0200
Subject: [PATCH] util/ScopeExit: use std::declval()

Fixes GCC 10 error:

 error: cannot call member function `Foo` without object
---
 src/util/ScopeExit.hxx | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/util/ScopeExit.hxx b/src/util/ScopeExit.hxx
index a53282676..b50468702 100644
--- a/src/util/ScopeExit.hxx
+++ b/src/util/ScopeExit.hxx
@@ -50,7 +50,7 @@ public:
 	   "noexcept" declaration allows the destructor to throw if
 	   the function can throw; without this, a throwing function
 	   would std::terminate() */
-	~ScopeExitGuard() noexcept(noexcept(F::operator()())) {
+	~ScopeExitGuard() noexcept(noexcept(std::declval<F>()())) {
 		if (enabled)
 			F::operator()();
 	}