Gael Guennebaud 296d24be4d bug #1381: fix sparse.diagonal() used as a rvalue. ...

The problem was that is "sparse" is not const, then sparse.diagonal() must have the
LValueBit flag meaning that sparse.diagonal().coeff(i) must returns a const reference,
const Scalar&. However, sparse::coeff() cannot returns a reference for a non-existing
zero coefficient. The trick is to return a reference to a local member of
evaluator<SparseMatrix>.

2017-01-25 17:39:01 +01:00

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