Remove const on nested expressions, and remove const_cast in mutators
Submitted by Benoit Jacob
Assigned to Nobody
Link to original bugzilla bug (#178)
Description
Currently expressions tend to store their nested expressions as const, for example at src/Core/Block.h:344, in class Block:
const typename XprType::Nested m_xpr; Consequently, mutators have to call const_cast_derived() on the nested expression.
This seems stupid and seems like something we want to fix for Eigen 3.1. By storing nested expressions with their own native constness, we could also drop those const_cast's.