EIGEN_STATIC_ASSERT_SAME_MATRIX_SIZEActualDstTypeCleanedSrc

The code you provided seems to be using a macro called EIGEN_STATIC_ASSERT_SAME_MATRIX_SIZE to assert that ActualDstTypeCleaned has the same size as Src.

This macro is likely defined in the Eigen library, which is a popular C++ template library for linear algebra. It is used to perform static assertions at compile-time to ensure that the dimensions of matrices match.

The specific purpose and implementation of the macro may depend on the version and configuration of Eigen being used. You can refer to the Eigen documentation or the source code to understand how this macro is implemented in your specific case