Here are the classes, structs, unions and interfaces with brief descriptions:

[detail level 123]

lpint
detail
Badge
MatrixEntry	Matrix entry type, for use in sparse matrix. The matrix entry base class is specialized as Row and Column, for the two sparse matrix representations. The class thus represents a row or column vector with mostly zero entries. Its operator[] is overloaded to provide access as if it is a dense vector. Access using operator[] is O(n) in time, with n the number of nonzero entries
Column
Row
Constraint	Struct to represent right-hand side of LP constraints. In linear programming, we have constraints of the form $Ax <\mathrm{cmp}> b,$ where represents an elementwise comparison operator, such as $\leq$ . This struct represents one element of the right-hand side of such a constraint, together with the elementwise comparison
Objective	Struct representing the objective vector. A linear program has the canonical form $\max c^T x.$ This structure represents the vector
Variable	Class representing a variable in the LP
Solution	Struct representing the solution of a linear program
LpException	Class for wrapping exception occurring in lpinterface. The linear program interface can return errors at many points, for various reasons. This exception classed is subclassed for each error cause, allowing fine-grained control over various error paths
NotImplementedError	Attempt to use a feature that is not yet implemented
ModelNotSolvedException	Attempt to access solution of an unsolved model
UnsupportedParameterException	Attempt set a parameter that is not supported by the current backend
UnsupportedConstraintException
InvalidMatrixEntryException	Attempt to add a matrix entry containing duplicate indices
UnsupportedVariableTypeException	Attempt to use a variable type that is not supported by the current backend
InvalidVariableBoundsException	Attempt to construct a variable with invalid bounds
GurobiException	Internal error occured in Gurobi
UnknownStatusException	Attempt to use a status code that is not supported
UnsupportedFeatureException	Attempt to use a feature that is not supported by the current backend
FailedToSetParameterException	Failed to set a parameter value
SoplexException	Internal error occured in SoPlex
MismatchedDimensionsException
ILinearProgramHandle	Interface representing linear program formulation. This interface represents linear programs of the form {min, max} c^T x, Ax <= b, x >= 0, where c, x, and b are real-valued vectors, and A is a real-valued matrix. The interface provides methods to modify the LP internally, as well access the LP structure
LinearProgramSolver	Interface to internal linear program solver. This interface is the most important interface within lpinterface. It allows one to generically use various different linear program solvers polymorphically. See the documentation of its methods and the implementations of this interface for usage information
LinearProgramHandleGurobi
GurobiSolver
LinearProgramHandleSoplex
SoplexSolver