value_of vs value_of_rec?

[Michael Betancourt]

What is the purpose of the two functions? As far as I can tell the
prim/rev/fwd implementations are all identical.

[Rob Trangucci]

value_of_rec returns the underlying double value, no matter the autodiff order (fvar<var> or fvar<fvar<var> >) whereas value_of will return the nested var or fvar.

So, value_of(fvar<var> x) returns x.val_ whereas value_of_rec(fvar<var> x) returns x.val_.val()

Rob

On Mon, Sep 28, 2015 at 8:40 AM, Michael Betancourt <betan...@gmail.com> wrote:

What is the purpose of the two functions?  As far as I can tell the
prim/rev/fwd implementations are all identical.

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