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In the current `dense_assignment_loop` implementations, if the destination's inner or outer size is zero at compile time and if the kernel involves a product, we currently get a compile error (#2080). This is triggered by attempting to multiply a non-existent row by a column (or vice-versa). To address this, we add a specialization for zero-sized assignments (`AllAtOnceTraversal`) which evaluates to a no-op. We also add a static check to ensure the size is in-fact zero. This now seems to be the only existing use of `AllAtOnceTraversal`. Fixes #2080.
Eigen is a C++ template library for linear algebra: matrices, vectors, numerical solvers, and related algorithms.
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