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Has to be fixed in the same way as subsetting vec

How to handle constants and r values in derivatives?

Arithmetic constants have to get their own class holding the value and the derivative. Furthermore, this has to be stored in AllVars

R values have to become lazy in the same way as eg binary operations. For instance a call to vector returns Vec which has a size and the operator [] returns always 0.

In case of derivatives a static code analysis has to be performed in r. All constants have to be stored in one class eg AllConst. Subsequently, the type of the individual constant can refer to the instance of class AllConst

Remove Sexp stuff with #define

• sexp s = 1 --> calls instead constructor. Can the constructor be removed?
• sexp s = vector(3,5) + 1; or similar terms does not compile. Need a constructor for VECPLUS etc.
• sexp s; s = 1; sexp v; v = s + vector(4,4); or similar terms throw runtime error. Which is wrong. Has to be removed in VECPLUS etc.