QSharedPointer: allow one create() argument in C++98, too

Survey says that most uses of QSharedPointer(T*) in Qt that could benefit from
variadic create() pass only a single argument. In order to prevent all such
uses from #ifdef'ing on the complex condition that enables the variadic version,
provide a single-argument version (for lvalues only, obviously) for C++98, too.

Change-Id: I22ad251a20bbf80867cc31eaa3bcec677bde4359
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

1 files changed, 21 insertions, 0 deletions

diff --git a/src/corelib/tools/qsharedpointer_impl.h b/src/corelib/tools/qsharedpointer_impl.h
index f70e398cfe..f3df32469f 100644
--- a/src/corelib/tools/qsharedpointer_impl.h
+++ b/src/corelib/tools/qsharedpointer_impl.h
@@ -441,6 +441,27 @@ public:
         result.d->setQObjectShared(result.value, true);
         return result;
     }
+
+    template <typename Arg>
+    static inline QSharedPointer create(const Arg &arg)
+    {
+        typedef QtSharedPointer::ExternalRefCountWithContiguousData<T> Private;
+# ifdef QT_SHAREDPOINTER_TRACK_POINTERS
+        typename Private::DestroyerFn destroy = &Private::safetyCheckDeleter;
+# else
+        typename Private::DestroyerFn destroy = &Private::deleter;
+# endif
+        QSharedPointer result(Qt::Uninitialized);
+        result.d = Private::create(&result.value, destroy);
+
+        // now initialize the data
+        new (result.data()) T(arg);
+# ifdef QT_SHAREDPOINTER_TRACK_POINTERS
+        internalSafetyCheckAdd(result.d, result.value);
+# endif
+        result.d->setQObjectShared(result.value, true);
+        return result;
+    }
 #endif
 
 private: