Commits on Apr 26, 2024

1. [solvers] Port solver back-ends to use SpecificOptions …

   In the near future, we anticipate changing the SolverOptions API in
   support of loading and saving (i.e., serialization). That's especially
   troublesome for our solver back-ends that consume its information,
   given the low-level and hodge-podge ways in which they hunt for and
   apply their specific options.
   
   This commit introduces a higher-level intermediary between solver
   back-ends and the program's options. Now SolverOptions are solely a
   user-facing aspect of defining a program; the solver back-ends never
   touch SolverOptions anymore. The new SolverBase::DoSolve2 virtual
   provides the mechanism for back-ends to take advantage of the new API.
   All solvers have been ported to use it. The old API remains intact for
   any out-of-tree solvers.
   
   The new API is also designed to improve uniformity of common errors,
   such as unknown names or wrongly-typed values.
   
   The new API also lays the groundwork for more efficient processing, as
   future work. It removes the need for the "Merge" (copy) operation in
   the hot path -- since it only provides a *view* of the options, it can
   easily keep track of several dictionaries and query them in order,
   with no copying.

   

   jwnimmer-tri committed Apr 26, 2024
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