The ConstantSolver class.

```
# S4 method for ConstantSolver
mip_capable(solver)
# S4 method for ConstantSolver,Problem
accepts(object, problem)
# S4 method for ConstantSolver,Problem
perform(object, problem)
# S4 method for ConstantSolver,Solution,list
invert(object, solution, inverse_data)
# S4 method for ConstantSolver
name(x)
# S4 method for ConstantSolver
import_solver(solver)
# S4 method for ConstantSolver
is_installed(solver)
# S4 method for ConstantSolver
solve_via_data(
object,
data,
warm_start,
verbose,
feastol,
reltol,
abstol,
num_iter,
solver_opts,
solver_cache
)
# S4 method for ConstantSolver,ANY
reduction_solve(object, problem, warm_start, verbose, solver_opts)
```

- solver, object, x
A ConstantSolver object.

- problem
A Problem object.

- solution
A Solution object to invert.

- inverse_data
A list containing data necessary for the inversion.

- data
Data for the solver.

- warm_start
A boolean of whether to warm start the solver.

- verbose
A boolean of whether to enable solver verbosity.

- feastol
The feasible tolerance.

- reltol
The relative tolerance.

- abstol
The absolute tolerance.

- num_iter
The maximum number of iterations.

- solver_opts
A list of Solver specific options

- solver_cache
Cache for the solver.

`mip_capable(ConstantSolver)`

: Can the solver handle mixed-integer programs?`accepts(object = ConstantSolver, problem = Problem)`

: Is the solver capable of solving the problem?`perform(object = ConstantSolver, problem = Problem)`

: Returns a list of the ConstantSolver, Problem, and an empty list.`invert(object = ConstantSolver, solution = Solution, inverse_data = list)`

: Returns the solution.`name(ConstantSolver)`

: Returns the name of the solver.`import_solver(ConstantSolver)`

: Imports the solver.`is_installed(ConstantSolver)`

: Is the solver installed?`solve_via_data(ConstantSolver)`

: Solve a problem represented by data returned from apply.`reduction_solve(object = ConstantSolver, problem = ANY)`

: Solve the problem and return a Solution object.