'Why using alignof on non-typed types is valid?

The data shows that alignof is used type-id, but why I can use Eigen::Matrix4f like below.

Eigen::Matrix4f t_localizer = ndt.getFinalTransformation();
std::cout << "t_localizer alignof: " << alignof(t_localizer);  // ??
std::cout << "t_localizer alignof: " << alignof(Eigen::Matrix4f); // valid

Both codes can compile and work!

c++eigenalignof


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