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✨ Add zero for functions #634

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Merged
merged 1 commit into from
Jan 18, 2019
Merged

✨ Add zero for functions #634

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8 changes: 8 additions & 0 deletions src/Utilities/functions.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -547,6 +547,14 @@ end

# Arithmetic

function Base.zero(::Type{MOI.ScalarAffineFunction{T}}) where T
return MOI.ScalarAffineFunction(MOI.ScalarAffineTerm{T}[], zero(T))
end
function Base.zero(::Type{MOI.ScalarQuadraticFunction{T}}) where T
return MOI.ScalarQuadraticFunction(MOI.ScalarAffineTerm{T}[],
MOI.ScalarQuadraticTerm{T}[], zero(T))
end

"""
operate(op::Function, ::Type{T},
args::Union{T, MOI.AbstractFunction}...)::MOI.AbstractFunction where T
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8 changes: 8 additions & 0 deletions test/Utilities/functions.jl
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Expand Up @@ -155,6 +155,10 @@
end
@testset "Scalar" begin
@testset "Affine" begin
@testset "zero" begin
f = @inferred MOIU.zero(MOI.ScalarAffineFunction{Float64})
@test MOIU.isapprox_zero(f, 1e-16)
end
@testset "promote_operation" begin
@test MOIU.promote_operation(+, Float64, MOI.SingleVariable,
MOI.SingleVariable) == MOI.ScalarAffineFunction{Float64}
Expand Down Expand Up @@ -225,6 +229,10 @@
end
end
@testset "Quadratic" begin
@testset "zero" begin
f = @inferred MOIU.zero(MOI.ScalarQuadraticFunction{Float64})
@test MOIU.isapprox_zero(f, 1e-16)
end
@testset "promote_operation" begin
@test MOIU.promote_operation(+, Int,
MOI.ScalarQuadraticFunction{Int},
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