Use wrap in assignment expr in cpp meta examples

[vinx13]

No description provided.

[vinx13]

let's address ref count things in transformers first and see how we deal with smart pointers.

[karlnapf]

I am confused :) But I will ignore this while it is closed

[vinx13]

i've changed ref count things in transformer, and now use a new variable name will work. the input are still valid (and no memory leak using smart pointer :)) after calling apply