Test if the solver is available on this system.
Nominally, this will return True if the solver interface is
valid and can be used to solve problems and False if it cannot.
Note that for licensed solvers there are a number of “levels” of
available: depending on the license, the solver may be available
with limitations on problem size or runtime (e.g., ‘demo’
vs. ‘community’ vs. ‘full’). In these cases, the solver may
return a subclass of enum.IntEnum, with members that resolve to
True if the solver is available (possibly with limitations).
The Enum may also have multiple members that all resolve to
False indicating the reason why the interface is not available
(not found, bad license, unsupported version, etc).
- Returns:
available – An enum that indicates “how available” the solver is.
Note that the enum can be cast to bool, which will
be True if the solver is runnable at all and False
otherwise.
- Return type:
Availability