public static @interface Java4C.ConstRef
Produces a const modifier for a reference (refers a const object). 
 Note that the const of C/C++ is not supported by the Java language. But it may be important for C/C++.
 In Java it should asserted that the referenced Object won't be changed.
 In opposite, a final modifier on the reference means in Java and in C: The reference itself won't be changed.