'Rotation using Transformation Matrix

Can someone please explain to me what does this function do :

void QMatrix4x4::rotate (   const QQuaternion &     quaternion  )

In the documentation, it's written that it multiples this matrix by another that rotates coordinates according to a specified quaternion. The question is which matrix is " this matrix" ? does it calculate a rotation matrix ?

c++qtmatrixrotationtransformation


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