Update qgsoptionalexpression.h

beketata · nyalldawson · commit 23562ab8b8f4 · 2020-05-18T07:48:15.000+10:00
With no "class" keyword on line 82 there is Error E0484 invalid explicit instantiation declaration.
diff --git a/src/core/qgsoptionalexpression.h b/src/core/qgsoptionalexpression.h
@@ -79,7 +79,7 @@ class CORE_EXPORT QgsOptionalExpression : public QgsOptional<QgsExpression>
 
 #if defined(_MSC_VER)
 #ifndef SIP_RUN
-template CORE_EXPORT QgsOptional<QgsExpression>;
+template class CORE_EXPORT QgsOptional<QgsExpression>;
 #endif
 #endif
 
