Initializion with Curly Brackets

Curly brackets for initialization got quite powerful. To not invent a
different style we should use the some style like for rounded brackets.

Change-Id: Id4789fb8d4d7f3980a3a8ce2df999cc57022a2a7
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

doc/api/coding-style.qdoc

@@ -900,6 +900,27 @@
     const QVector<int> values = {1, 2, 3, 4, 5};
     \endcode
 
+    \section3 Initialization with Curly Brackets
+
+    If you use initialization with curly brackets, follow the same rules as with
+    round brackets. For example:
+
+    \code
+    class Values // the following code is quite useful for test fixtures
+    {
+        float floatValue = 4; // prefer that for simple types
+        QVector<int> values = {1, 2, 3, 4, integerValue}; // prefer that syntax for initializer lists
+        SomeValues someValues{"One", 2, 3.4}; // not an initializer_list
+        SomeValues &someValuesReference = someValues;
+        ComplexType complexType{values, otherValues} // constructor call
+    }
+
+    object.setEntry({"SectionA", value, doubleValue}); // calls a constructor
+    object.setEntry({}); // calls default constructor
+    \endcode
+
+    But be careful not to overuse it, to not obfuscate your code.
+
     \section3 Non-Static Data Member Initialization
 
     Use non-static data member initialization for trivial initializations, except in public