Remove objective_constant

src/LinQuadOptInterface.jl

@@ -284,8 +284,6 @@ macro LinQuadOptimizerBase(inner_model_type=Any)
     constraint_to_name::Dict{LinQuadOptInterface.CI, String}
     name_to_constraint::Union{Nothing, Dict{String, LinQuadOptInterface.CI}}
 
-    objective_constant::Float64
-
     termination_status::MOI.TerminationStatusCode
     primal_status::MOI.ResultStatusCode
     dual_status::MOI.ResultStatusCode
@@ -361,8 +359,6 @@ function MOI.empty!(m::M, env = nothing) where M<:LinQuadOptimizer
     m.constraint_to_name = Dict{CI, String}()
     m.name_to_constraint = nothing
 
-    m.objective_constant = 0.0
-
     m.termination_status = MathOptInterface.OPTIMIZE_NOT_CALLED
     m.primal_status = MathOptInterface.NO_SOLUTION
     m.dual_status = MathOptInterface.NO_SOLUTION

src/mockoptimizer.jl

@@ -16,7 +16,7 @@ mutable struct MockLinQuadModel # <: LinQuadOptInterface.LinQuadOptimizer
     b::Vector{Float64}
     c::Vector{Float64}
     Qobj::Matrix{Float64}
-
+    objective_constant::Float64
     range::Vector{Float64} # constraint UB for range
 
     lb::Vector{Float64}
@@ -42,7 +42,7 @@ mutable struct MockLinQuadModel # <: LinQuadOptInterface.LinQuadOptimizer
     quadratic_primal_solution::Vector{Float64}
     quadratic_dual_solution::Vector{Float64}
 
-    function MockLinQuadModel(env::Nothing,str::String="defaultname")
+    function MockLinQuadModel(env::Nothing, str::String = "defaultname")
         m = new()
 
         m.sense = :minimize
@@ -52,6 +52,7 @@ mutable struct MockLinQuadModel # <: LinQuadOptInterface.LinQuadOptimizer
         m.b = zeros(0)
         m.c = zeros(0)
         m.Qobj = zeros(0,0)
+        m.objective_constant = 0.0
 
         m.range = zeros(0)
 
@@ -637,6 +638,15 @@ function LQOI.set_linear_objective!(instance::MockLinQuadOptimizer, colvec, coef
     return
 end
 
+function LQOI.set_constant_objective!(model::MockLinQuadOptimizer, value)
+    model.inner.objective_constant = value
+    return
+end
+
+function LQOI.get_constant_objective(model::MockLinQuadOptimizer)
+    return model.inner.objective_constant
+end
+
 function LQOI.change_objective_sense!(instance::MockLinQuadOptimizer, symbol)
     if symbol == :min
         instance.inner.sense = :minimize
@@ -823,7 +833,7 @@ function get_objval(inner::MockLinQuadModel)
         Q = Matrix(Symmetric(inner.Qobj, :U))
         obj += (0.5) * x' * Q * x
     end
-    return obj
+    return obj + inner.objective_constant
 end
 
 LQOI.get_objective_value(instance::MockLinQuadOptimizer) = get_objval(instance.inner)

src/solve.jl

@@ -105,17 +105,7 @@ end
 
 function MOI.get(model::LinQuadOptimizer, attr::MOI.ObjectiveValue)
     if attr.resultindex == 1
-        # Note: we add m.objective_constant here to account for any constant
-        # term which was not passed to the solver itself (and which therefore
-        # would not be accounted for in `get_objective_value(m)`. We do *not*
-        # call `get_constant_objective(m)` because that would also pull any
-        # constants which were passed to the solver, resulting those constants
-        # being counted twice. This confusion will be alleviated when all LQOI
-        # solvers implement `get_constant_objective()` and
-        # `set_constant_objective!()` by actually passing the relevant constants
-        # to the solvers, at which point we can just get rid of
-        # m.objective_constant entirely.
-        return get_objective_value(model) + model.objective_constant
+        return get_objective_value(model)
     else
         error("Unable to access multiple objective values")
     end

src/solver_interface.jl

@@ -341,10 +341,7 @@ value.
 Solver interfaces that overload this behavior (e.g. to pass that constant
 objective to the solver itself) must also overload `get_constant_objective(m)`.
 """
-function set_constant_objective!(m::LinQuadOptimizer, value)
-    m.objective_constant = value
-    return
-end
+function set_constant_objective! end
 
 """
     set_quadratic_objective!(m, I::Vector{Int}, J::Vector{Int}, V::Vector{Float64})::Nothing
@@ -390,7 +387,7 @@ function change_objective_sense! end
 
 Return the constant (i.e. offset) component of the objective.
 """
-get_constant_objective(m::LinQuadOptimizer) = m.objective_constant
+function get_constant_objective end
 
 """
     get_linear_objective!(m, x::Vector{Float64})