append_to accesses private methods from MOI.Utilities

[odow]

See

BilevelJuMP.jl/src/moi_utilities.jl

Lines 21 to 70 in 954467f

	function append_to(
	dest::MOI.ModelLike,
	src::MOI.ModelLike,
	idxmap,
	filter_constraints::Union{Nothing,Function} = nothing;
	allow_single_bounds::Bool = true,
	)
	#=
	This function follows closely the function `default_copy_to` defined in
	MathOptInterface.Utilities
	due to some caveats of this function we keep the commented functions
	from the original function to highlight the differences and
	easen the burden of updating when `default_copy_to` is updated.
	=#
	# MOI.empty!(dest)
	# idxmap = MOIU.IndexMap()
	vis_src = MOI.get(src, MOI.ListOfVariableIndices())
	# index_map_for_variable_indices only initializes the data structure
	# idxmap = index_map_for_variable_indices(vis_src)
	# The `NLPBlock` assumes that the order of variables does not change (#849)
	if MOI.NLPBlock() in MOI.get(src, MOI.ListOfModelAttributesSet())
	error("NLP models are not supported.")
	# constraint_types = MOI.get(src, MOI.ListOfConstraints())
	# single_variable_types = [S for (F, S) in constraint_types
	# if F == MOI.VariableIndex]
	# vector_of_variables_types = [S for (F, S) in constraint_types
	# if F == MOI.VectorOfVariables]
	# vector_of_variables_not_added = [
	# MOI.get(src, MOI.ListOfConstraintIndices{MOI.VectorOfVariables, S}())
	# for S in vector_of_variables_types
	# ]
	# single_variable_not_added = [
	# MOI.get(src, MOI.ListOfConstraintIndices{MOI.VariableIndex, S}())
	# for S in single_variable_types
	# ]
	else
	# the key asusmption here is that MOI keeps the following behaviour
	# "The copy is only done when
	# the variables to be copied are not already keys of `idxmap`. It returns a list
	# of the constraints copied and not copied."
	# from copy_single_variable and copy_vector_of_variables.
	# this is very importante because variables are shered between
	# upper, lower and lower dual levels
	constraints_not_added = Any[
	MOIU._try_constrain_variables_on_creation(dest, src, idxmap, S)

x-ref jump-dev/MathOptInterface.jl#2520