[Clp] Question about ClpPrimalColumnPivot.saveWeights

[Dami Choi]

Hello,

I hope this isn't a stupid question, but I felt like I didn't understand
the documentation.
What is the purpose of the saveWeights function in ClpPrimalColumnPivot?
I'm also confused why the model_ attribute has to be reset everytime the
saveWeights is called, for example here
<https://projects.coin-or.org/Clp/browser/trunk/src/ClpPrimalColumnDantzig.hpp#L41>
and here
<https://projects.coin-or.org/Clp/browser/trunk/src/ClpPrimalColumnSteepest.cpp#L3168>.
What is the reason for this? If primal() is called from ClpSimplex, then
doesn't the model always result in the same model? Why update this every
time?

Thank you,

Dami
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