[CppAD] Avoid retaping when constant is changed

[Hilario Tomé]

Dear all,



I would like to know if it's possible to record a pointer to an external
value in the tape. The use case is to have formulas like y = constant*x.
Once the ADfun object is created if I change the value of constant I have
to retape right now, and sometimes the re-taping operation is to costly,
especially if sparsity operations are involved.



Best,

-- 
Hilario.
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