[Ipopt] about presolve in ipopt solver

[Zhiyuan Dong]

Is it possible to do some presolve from ipopt c++ api directly to achieve
problem size reduction ( columns and rows ) before the IPOPT solver
actually solves it.

I ask this question b/c I know that AMPL has a presolve option. But,
suppose we are not allowed to call AMPL to do presolve, my question is :

is there an exiting online IPOPT C++ example illustrating how to do this?
Some general comments along this direction are more than welcome!

Thanks!

Zhiyuan
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