1 files changed, 114 insertions, 0 deletions
diff --git a/src/corelib/global/qtversionchecks.h b/src/corelib/global/qtversionchecks.h
new file mode 100644
index 0000000000..86fc094f4e
--- /dev/null
+++ b/src/corelib/global/qtversionchecks.h
@@ -0,0 +1,114 @@
+// Copyright (C) 2022 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+#ifndef QTVERSIONCHECKS_H
+#define QTVERSIONCHECKS_H
+
+#if 0
+#pragma qt_class(QtVersionChecks)
+#pragma qt_sync_stop_processing
+#endif
+
+#include <QtCore/qtconfiginclude.h>
+
+/*
+   QT_VERSION is (major << 16) | (minor << 8) | patch.
+*/
+#define QT_VERSION      QT_VERSION_CHECK(QT_VERSION_MAJOR, QT_VERSION_MINOR, QT_VERSION_PATCH)
+/*
+   can be used like #if (QT_VERSION >= QT_VERSION_CHECK(6, 4, 0))
+*/
+#define QT_VERSION_CHECK(major, minor, patch) ((major<<16)|(minor<<8)|(patch))
+
+/*
+   Helper macros to make some simple code active in Qt 6 or Qt 7 only,
+   like:
+     struct QT6_ONLY(Q_CORE_EXPORT) QTrivialClass
+     {
+         void QT7_ONLY(Q_CORE_EXPORT) void operate();
+     }
+*/
+#if QT_VERSION_MAJOR == 7 || defined(QT_BOOTSTRAPPED)
+#  define QT7_ONLY(...)         __VA_ARGS__
+#  define QT6_ONLY(...)
+#elif QT_VERSION_MAJOR == 6
+#  define QT7_ONLY(...)
+#  define QT6_ONLY(...)         __VA_ARGS__
+#else
+#  error Qt major version not 6 or 7
+#endif
+
+/* Macro and tag type to help overload resolution on functions
+   that are, e.g., QT_REMOVED_SINCE'ed. Example use:
+
+   #if QT_CORE_REMOVED_SINCE(6, 4)
+   int size() const;
+   #endif
+   qsizetype size(QT6_DECL_NEW_OVERLOAD) const;
+
+   in the normal cpp file:
+
+   qsizetype size(QT6_IMPL_NEW_OVERLOAD) const {
+      ~~~
+   }
+
+   in removed_api.cpp:
+
+   int size() const { return int(size(QT6_CALL_NEW_OVERLOAD)); }
+*/
+#ifdef Q_QDOC
+# define QT6_DECL_NEW_OVERLOAD
+# define QT6_DECL_NEW_OVERLOAD_TAIL
+# define QT6_IMPL_NEW_OVERLOAD
+# define QT6_IMPL_NEW_OVERLOAD_TAIL
+# define QT6_CALL_NEW_OVERLOAD
+# define QT6_CALL_NEW_OVERLOAD_TAIL
+#else
+# define QT6_DECL_NEW_OVERLOAD QT6_ONLY(Qt::Disambiguated_t = Qt::Disambiguated)
+# define QT6_DECL_NEW_OVERLOAD_TAIL QT6_ONLY(, QT6_DECL_NEW_OVERLOAD)
+# define QT6_IMPL_NEW_OVERLOAD QT6_ONLY(Qt::Disambiguated_t)
+# define QT6_IMPL_NEW_OVERLOAD_TAIL QT6_ONLY(, QT6_IMPL_NEW_OVERLOAD)
+# define QT6_CALL_NEW_OVERLOAD QT6_ONLY(Qt::Disambiguated)
+# define QT6_CALL_NEW_OVERLOAD_TAIL QT6_ONLY(, QT6_CALL_NEW_OVERLOAD)
+#endif
+
+/*
+    Macro to tag Tech Preview APIs.
+    It expands to nothing, because we want to use it in places where
+    nothing is generally allowed (not even an attribute); for instance:
+    to tag other macros, Q_PROPERTY declarations, and so on.
+
+    Still: use it as if it were an C++ attribute.
+
+    To mark a class as TP:
+        class QT_TECH_PREVIEW_API Q_CORE_EXPORT QClass { ... };
+
+    To mark a function:
+        QT_TECH_PREVIEW_API void qFunction();
+
+    To mark an enumeration or enumerator:
+        enum class QT_TECH_PREVIEW_API QEnum {
+            Enum1,
+            Enum2 QT_TECH_PREVIEW_API,
+        };
+
+    To mark parts of a class:
+        class QClass : public QObject
+        {
+            // Q_OBJECT omitted d/t QTBUG-123229
+
+            QT_TECH_PREVIEW_API
+            Q_PROPERTY(int countNG ...)   // this is TP
+
+            Q_PROPERTY(int count ...)     // this is stable API
+
+        public:
+            QT_TECH_PREVIEW_API
+            void f();     // TP
+
+            void g();     // stable
+        };
+*/
+#define QT_TECH_PREVIEW_API
+
+#endif /* QTVERSIONCHECKS_H */