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determines the orientation of the points of the tuple A = tuple [first,last) where A consists of d+1 points in
d-space. This is the sign of the determinant
where A[i] denotes the
Cartesian
coordinate vector of
the i-th point in A.
| Precondition: | size [first,last) == d+1 and
A[i].dimension() == d ∀ 0 ≤ i ≤ d.
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| Requirement: | The value type of ForwardIterator is Point_d<R>. |
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