From b8a8367e5fcde8a119ea00962bb2154631c6193c Mon Sep 17 00:00:00 2001
From: Marc Mutz <marc.mutz@qt.io>
Date: Fri, 15 Dec 2023 16:47:15 +0100
Subject: [PATCH] qxp::function_ref: reuse a constraint for the deduction guide

No functional change, just using the already-existing named constraint
instead of more enable_if fiddling.

Amends 29b65c98e720056e87334ce88a683969e57efd3d.

Pick-to: 6.5
Change-Id: Idae4962834f14e2a5273099b5611ebcbb2a54447
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
(cherry picked from commit 41c41b4ba58ee4a7d5f66d8f03d40b8631ba7547)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
(cherry picked from commit 672448c712ba7cfba41100ad79416cfd6de5756f)
---
 src/corelib/global/qxpfunctional.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/corelib/global/qxpfunctional.h b/src/corelib/global/qxpfunctional.h
index 60508f6315c..cc2942b1c6a 100644
--- a/src/corelib/global/qxpfunctional.h
+++ b/src/corelib/global/qxpfunctional.h
@@ -182,7 +182,7 @@ QT_SPECIALIZE_FUNCTION_REF(const, true );
 
 template <
     class F,
-    std::enable_if_t<std::is_function_v<F>, bool> = true
+    detail::if_function<F> = true
 >
 function_ref(F*) -> function_ref<F>;