## Submitted by Benoit Jacob Assigned to **Nobody** **[Link to original bugzilla bug (#58)](https://eigen.tuxfamily.org/bz/show_bug.cgi?id=58)** ## Description All direct access Block/Map types should be unified so as to reduce as much as possible the number of template instantiations. E.g. Block<Block&lt;Matrix&gt;> is just a Map. This could mean that the return type of block(...) becomes an internal thing that we must always hide behind a BlockReturnType helper. ### Blocking #344 #408 #884 #1608