[CppAD] Multiplication of scalar (double) and Vector (AD< AD<double> >)

[Leitz, Thomas]

Hello,

I'm using CppAD with Eigen. Multiplication of a double with an Eigen-Vector like this:

---

template<typename Type>
using Vector = Eigen::Matrix<Type, Eigen::Dynamic, 1>;

Vector< AD< AD<double> > > tmp;

tmp = tmp + 0.5 * tmp;

---

gives the following error


 error: invalid operands to binary expression ('double' and 'Vector<AD<AD<double> > >' (aka 'Eigen::Matrix<CppAD::AD<CppAD::AD<double> >, -1, 1, 0, -1, 1>'))

    tmp = tmp + 0.5 * tmp;


The error goes away if I do

---
tmp = tmp + AD<double>(0.5) * tmp;
---

Is this the right way to do it?
Btw. an AD< AD<double> > can be multiplied by a double just fine.

Thomas
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