From d72f2ca9ea5e8bc7357f457370b2eb039bb48a2f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?M=C3=A5rten=20Nordheim?= <marten.nordheim@qt.io>
Date: Mon, 4 Apr 2022 19:40:52 +0200
Subject: QMetaType: Add qHash() overload

This is needed for use in QHash and similar.
It's essentially the same as using the integer id, but typesafe

Change-Id: I9515b8e178c8f9828934cb0bb099cce5553ec393
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
Reviewed-by: Marc Mutz <marc.mutz@qt.io>
---
 src/corelib/kernel/qmetatype.h | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'src/corelib/kernel/qmetatype.h')

diff --git a/src/corelib/kernel/qmetatype.h b/src/corelib/kernel/qmetatype.h
index a8962f8b57..8b52752470 100644
--- a/src/corelib/kernel/qmetatype.h
+++ b/src/corelib/kernel/qmetatype.h
@@ -52,6 +52,7 @@
 #ifndef QT_NO_QOBJECT
 #include <QtCore/qobjectdefs.h>
 #endif
+#include <QtCore/qhashfunctions.h>
 
 #include <array>
 #include <new>
@@ -2536,6 +2537,13 @@ constexpr const QtPrivate::QMetaTypeInterface *const qt_incomplete_metaTypeArray
     QtPrivate::qTryMetaTypeInterfaceForType<Unique, T>()...
 };
 
+inline size_t qHash(QMetaType type, size_t seed = 0)
+{
+    // We cannot use d_ptr here since the same type in different DLLs
+    // might result in different pointers!
+    return qHash(type.id(), seed);
+}
+
 QT_END_NAMESPACE
 
 QT_DECL_METATYPE_EXTERN_TAGGED(QtMetaTypePrivate::QPairVariantInterfaceImpl,
-- 
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