Errors

struct InvalidIndex{IndexType<:Index} <: Exception
    index::IndexType
end

An error indicating that the index index is invalid.

struct ResultIndexBoundsError{AttrType} <: Exception
    attr::AttrType
    result_count::Int
end

An error indicating that the requested attribute attr could not be retrieved, because the solver returned too few results compared to what was requested. For instance, the user tries to retrieve VariablePrimal(2) when only one solution is available, or when the model is infeasible and has no solution.

See also: check_result_index_bounds.

check_result_index_bounds(model::ModelLike, attr)

This function checks whether enough results are available in the model for the requested attr, using its result_index field. If the model does not have sufficient results to answer the query, it throws a ResultIndexBoundsError.

struct ScalarFunctionConstantNotZero{T, F, S} <: Exception
    constant::T
end

An error indicating that the constant part of the function in the constraint F-in-S is nonzero.

LowerBoundAlreadySet{S1, S2}

Error thrown when setting a VariableIndex-in-S2 when a VariableIndex-in-S1 has already been added and the sets S1, S2 both set a lower bound, i.e. they are EqualTo, GreaterThan, Interval, Semicontinuous or Semiinteger.

UpperBoundAlreadySet{S1, S2}

Error thrown when setting a VariableIndex-in-S2 when a VariableIndex-in-S1 has already been added and the sets S1, S2 both set an upper bound, i.e. they are EqualTo, LessThan, Interval, Semicontinuous or Semiinteger.

struct OptimizeInProgress{AttrType<:AnyAttribute} <: Exception
    attr::AttrType
end

Error thrown from optimizer when MOI.get(optimizer, attr) is called inside an AbstractCallback while it is only defined once optimize! has completed. This can only happen when is_set_by_optimize(attr) is true.

struct InvalidCallbackUsage{C, S} <: Exception
    callback::C
    submittable::S
end

An error indicating that submittable cannot be submitted inside callback.

For example, UserCut cannot be submitted inside LazyConstraintCallback.

UnsupportedError <: Exception

Abstract type for error thrown when an element is not supported by the model.

NotAllowedError <: Exception

Abstract type for error thrown when an operation is supported but cannot be applied in the current state of the model.

struct UnsupportedAttribute{AttrType} <: UnsupportedError
    attr::AttrType
    message::String
end

An error indicating that the attribute attr is not supported by the model, i.e. that supports returns false.

struct SetAttributeNotAllowed{AttrType} <: NotAllowedError
    attr::AttrType
    message::String
end

An error indicating that the attribute attr is supported (see supports) but cannot be set for some reason (see the error string).

struct AddVariableNotAllowed <: NotAllowedError
    message::String # Human-friendly explanation why the attribute cannot be set
end

An error indicating that variables cannot be added to the model.

struct UnsupportedConstraint{F<:AbstractFunction, S<:AbstractSet} <: UnsupportedError
    message::String # Human-friendly explanation why the attribute cannot be set
end

An error indicating that constraints of type F-in-S are not supported by the model, i.e. that supports_constraint returns false.

struct AddConstraintNotAllowed{F<:AbstractFunction, S<:AbstractSet} <: NotAllowedError
    message::String # Human-friendly explanation why the attribute cannot be set
end

An error indicating that constraints of type F-in-S are supported (see supports_constraint) but cannot be added.

struct ModifyConstraintNotAllowed{F<:AbstractFunction, S<:AbstractSet,
                                  C<:AbstractFunctionModification} <: NotAllowedError
    constraint_index::ConstraintIndex{F, S}
    change::C
    message::String
end

An error indicating that the constraint modification change cannot be applied to the constraint of index ci.

struct ModifyObjectiveNotAllowed{C<:AbstractFunctionModification} <: NotAllowedError
    change::C
    message::String
end

An error indicating that the objective modification change cannot be applied to the objective.

struct DeleteNotAllowed{IndexType <: Index} <: NotAllowedError
    index::IndexType
    message::String
end

An error indicating that the index index cannot be deleted.

struct UnsupportedSubmittable{SubmitType} <: UnsupportedError
    sub::SubmitType
    message::String
end

An error indicating that the submittable sub is not supported by the model, i.e. that supports returns false.

struct SubmitNotAllowed{SubmitTyp<:AbstractSubmittable} <: NotAllowedError
    sub::SubmitType
    message::String
end

An error indicating that the submittable sub is supported (see supports) but cannot be added for some reason (see the error string).

SettingVariableIndexNotAllowed()

Error type that should be thrown when the user calls set to change the ConstraintFunction of a VariableIndex constraint.