From 2ec77f4f11b5e01e25307a068cd3b360b37011e0 Mon Sep 17 00:00:00 2001
From: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>
Date: Thu, 3 Nov 2022 21:44:41 +0100
Subject: [PATCH] QFlatMap: fix a declval usage

The comparator object is allowed to reject rvalues. Use a const
lvalue ref.

Change-Id: Id4ab5e094f3a0f4e6b2549ee5d3105d93faf1d14
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
---
 src/corelib/tools/qflatmap_p.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/corelib/tools/qflatmap_p.h b/src/corelib/tools/qflatmap_p.h
index 28bb72c864..ba02503d2b 100644
--- a/src/corelib/tools/qflatmap_p.h
+++ b/src/corelib/tools/qflatmap_p.h
@@ -74,7 +74,7 @@ public:
 
     using value_type = std::pair<const Key, T>;
     static constexpr bool is_comparator_noexcept = noexcept(
-        std::declval<Compare>()(std::declval<Key>(), std::declval<Key>()));
+        std::declval<Compare>()(std::declval<const Key &>(), std::declval<const Key &>()));
 
     bool operator()(const value_type &lhs, const value_type &rhs) const
         noexcept(is_comparator_noexcept)