Add currentType function to QOperatingSystemVersion

This allows us to retrieve the current OS type without constructing an
instance of the class, and it's also constexpr.

Change-Id: I8b32a1aebeb8139fe3fcf146e5de558fa1060bb8
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/corelib/global/qoperatingsystemversion.cpp

@@ -155,6 +155,8 @@ QT_BEGIN_NAMESPACE
     \fn QOperatingSystemVersion QOperatingSystemVersion::current()
 
     Returns a QOperatingSystemVersion indicating the current OS and its version number.
+
+    \sa currentType()
 */
 #if !defined(Q_OS_DARWIN) && !defined(Q_OS_WIN)
 QOperatingSystemVersion QOperatingSystemVersion::current()
@@ -300,6 +302,14 @@ int QOperatingSystemVersion::compare(const QOperatingSystemVersion &v1,
     \sa name()
 */
 
+/*!
+    \fn QOperatingSystemVersion::OSType QOperatingSystemVersion::currentType()
+
+    Returns the current OS type without constructing a QOperatingSystemVersion instance.
+
+    \sa current()
+*/
+
 /*!
     \fn QString QOperatingSystemVersion::name() const
 

src/corelib/global/qoperatingsystemversion.h

@@ -92,6 +92,25 @@ public:
 
     static QOperatingSystemVersion current();
 
+    static Q_DECL_CONSTEXPR OSType currentType()
+    {
+#if defined(Q_OS_WIN)
+        return Windows;
+#elif defined(Q_OS_MACOS)
+        return MacOS;
+#elif defined(Q_OS_IOS)
+        return IOS;
+#elif defined(Q_OS_TVOS)
+        return TvOS;
+#elif defined(Q_OS_WATCHOS)
+        return WatchOS;
+#elif defined(Q_OS_ANDROID)
+        return Android;
+#else
+        return Unknown;
+#endif
+    }
+
     Q_DECL_CONSTEXPR int majorVersion() const { return m_major; }
     Q_DECL_CONSTEXPR int minorVersion() const { return m_minor; }
     Q_DECL_CONSTEXPR int microVersion() const { return m_micro; }

src/corelib/global/qoperatingsystemversion_p.h

@@ -63,25 +63,6 @@ QT_BEGIN_NAMESPACE
 OSVERSIONINFOEX qWindowsVersionInfo();
 #endif
 
-static inline QOperatingSystemVersion::OSType currentType()
-{
-#if defined(Q_OS_WIN)
-    return QOperatingSystemVersion::Windows;
-#elif defined(Q_OS_MACOS)
-    return QOperatingSystemVersion::MacOS;
-#elif defined(Q_OS_IOS)
-    return QOperatingSystemVersion::IOS;
-#elif defined(Q_OS_TVOS)
-    return QOperatingSystemVersion::TvOS;
-#elif defined(Q_OS_WATCHOS)
-    return QOperatingSystemVersion::WatchOS;
-#elif defined(Q_OS_ANDROID)
-    return QOperatingSystemVersion::Android;
-#else
-    return QOperatingSystemVersion::Unknown;
-#endif
-}
-
 QT_END_NAMESPACE
 
 #endif // QOPERATINGSYSTEMVERSION_P_H