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Allow symbols to be used in compile-time expressions.

Antonio Sánchezrequested to merge
cantonios/eigen:symbolic into master

This enables us to determine compile-time sizes in expressions involving Eigen::indexing::last.

Required some bigger changes:

  • Refactored SymbolicIndex to allow compile-time evaluation.
  • Renamed UndefinedIncr to Undefined to use for first/size expressions as well
  • Refactored IndexededViewHelper to simplify handling of first/size/incr, reducing the number of free functions

With these, indexed expressions with compile-time constants now behave exactly like the block versions in the slicing tutorial.

Fixes #2535 (closed).

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