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Merged
odow merged 1 commit into from
Mar 20, 2026
Merged

Add support for complementarity constraints #206

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6 changes: 5 additions & 1 deletion README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -106,6 +106,10 @@ List of supported constraint types:
* [`MOI.VariableIndex`](@ref) in [`MOI.Interval{Float64}`](@ref)
* [`MOI.VariableIndex`](@ref) in [`MOI.LessThan{Float64}`](@ref)
* [`MOI.VariableIndex`](@ref) in [`MOI.ZeroOne`](@ref)
* [`MOI.VectorOfVariables`](@ref) in [`MOI.Complements`](@ref)
* [`MOI.VectorAffineFunction`](@ref) in [`MOI.Complements`](@ref)
* [`MOI.VectorQuadraticFunction`](@ref) in [`MOI.Complements`](@ref)
* [`MOI.VectorNonlinearFunction`](@ref) in [`MOI.Complements`](@ref)

List of supported model attributes:

Expand All @@ -115,7 +119,7 @@ List of supported model attributes:

Note that some solver executables may not support the full list of constraint
types. For example, `Ipopt_jll` does not support `MOI.Integer` or `MOI.ZeroOne`
constraints.
constraints, nor does it support the `MOI.Complements` set.

## Options

Expand Down
38 changes: 7 additions & 31 deletions src/AmplNLWriter.jl
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Expand Up @@ -223,42 +223,18 @@ function MOI.set(model::Optimizer, attr::MOI.RawOptimizerAttribute, value)
return
end

const _SCALAR_FUNCTIONS = Union{
MOI.VariableIndex,
MOI.ScalarAffineFunction{Float64},
MOI.ScalarQuadraticFunction{Float64},
MOI.ScalarNonlinearFunction,
}

const _SCALAR_SETS = Union{
MOI.LessThan{Float64},
MOI.GreaterThan{Float64},
MOI.EqualTo{Float64},
MOI.Interval{Float64},
}

function MOI.supports_constraint(
::Optimizer,
::Type{<:_SCALAR_FUNCTIONS},
::Type{<:_SCALAR_SETS},
)
return true
model::Optimizer,
::Type{F},
::Type{S},
) where {F<:MOI.AbstractFunction,S<:MOI.AbstractSet}
return MOI.supports_constraint(model.inner, F, S)
end

function MOI.supports_constraint(
::Optimizer,
::Type{MOI.VariableIndex},
::Type{<:Union{MOI.ZeroOne,MOI.Integer}},
)
return true
function MOI.supports(model::Optimizer, attr::MOI.AbstractModelAttribute)
return MOI.supports(model.inner, attr)
end

MOI.supports(::Optimizer, ::MOI.ObjectiveFunction{<:_SCALAR_FUNCTIONS}) = true

MOI.supports(::Optimizer, ::MOI.ObjectiveSense) = true

MOI.supports(::Optimizer, ::MOI.NLPBlock) = true

function MOI.supports(
::Optimizer,
::MOI.VariablePrimalStart,
Expand Down
11 changes: 11 additions & 0 deletions test/MOI_wrapper.jl
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Expand Up @@ -80,6 +80,8 @@ function test_ipopt_runtests()
"_SOS2_",
"test_linear_integer_",
"test_cpsat_",
# Ipopt doesn't support complementarity
"_complementarity",
],
)
return
Expand Down Expand Up @@ -293,6 +295,15 @@ function test_supports_incremental_interface()
return
end

function test_supports_complements()
model = AmplNLWriter.Optimizer()
inner = MOI.FileFormats.NL.Model()
F, S = MOI.VectorOfVariables, MOI.Complements
@test MOI.supports_constraint(model, F, S) ==
MOI.supports_constraint(inner, F, S)
return
end

end # module

TestMOIWrapper.runtests()
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