[GiNaC-list] let_op() and index

[Chris Dams]

Dear Marco,

On Thu, 24 Feb 2005 mdias at ift.unesp.br wrote:

> test.cpp:88: error: invalid initialization of reference of type 'GiNaC::ex&'
>    from expression of type 'GiNaC::idx'

It is better to make covdiff::index into an ex. What if somebody is going
to initialize a covdiff from a varidx? The varidx will get stripped into
an idx. I don't think that is what you want.

Best wishes,
Chris