[ library(eplex) | Reference Manual | Alphabetic Index ]
Get a runtime license token for the external solver.
The eplex-library interfaces to an external simplex/MIP solver
which might require a license to run (e.g. CPLEX, XPRESS-MP, Gurobi).
When the eplex-library is loaded, it tries to obtain a license
immediately. If this is not possible, for example because the
license pool is temporarily empty, a warning is printed. The
application program should then call lp_get_license/0 later
to obtain a license before any eplex functionality is used.
If a license is successfully obtained or already held,
lp_get_license succeeds, otherwise it fails.
This predicate uses information from the file eplex_lic_info.ecl
in the ECLiPSe library directory, or solver specific environment
variable settings to locate the licensing information.
Fails if no license can (currently) be obtained
lp_get_license / 2, lp_release_license / 0