[OS-tickets] [Optimization Services] #53: handling of ASL MAXLIST

[Optimization Services]

#53: handling of ASL MAXLIST
---------------------------+-----------------
 Reporter:  stefan         |      Owner:
     Type:  defect         |     Status:  new
 Priority:  minor          |  Milestone:
Component:  other/unknown  |    Version:
 Keywords:                 |
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 The MAXLIST operand in an AMPL expression is not handled correctly.
 The attached files should demonstrate this behavior.

 I talked to Victor at AMPL and the correct way to handle MAXLIST is to do
 the following:


 You should first cast a pointer to an expression representing max
 (MAXLIST)
 from expr* to expr_va*
 (https://github.com/ampl/ampl/blob/master/solvers/nlp.h#L100). Then you
 can iterate over arguments as follows:
 {{{
 for (const de *d = ((expr_va*)e)->L.d; d->e; ++d) {
   // d->e points to an argument
 }
 }}}
 Here's a simple C++ wrapper around expr_va which can be used as an
 example:
 https://github.com/ampl/ampl/blob/master/solvers/util/expr.h#L446

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Ticket URL: <https://projects.coin-or.org/OS/ticket/53>
Optimization Services <http://projects.coin-or.org/OS>
An interface for Web services implementing optimization.