default_copy_to accesses private methods

[odow]

See

ParametricOptInterface.jl/src/MOI_wrapper.jl

Lines 1390 to 1428 in 4ec565a

	function _poi_default_copy_to(dest::T, src::MOI.ModelLike) where {T}
	if !MOI.supports_incremental_interface(dest)
	error("Model $(typeof(dest)) does not support copy_to.")
	end
	MOI.empty!(dest)
	vis_src = MOI.get(src, MOI.ListOfVariableIndices())
	index_map = MOI.IndexMap()
	# The `NLPBlock` assumes that the order of variables does not change (#849)
	# Therefore, all VariableIndex and VectorOfVariable constraints are added
	# seprately, and no variables constrained-on-creation are added.
	# This is not valid for NLPs with Parameters, they should enter
	has_nlp = MOI.NLPBlock() in MOI.get(src, MOI.ListOfModelAttributesSet())
	constraints_not_added = if has_nlp
	vcat(
	Any[
	MOI.get(src, MOI.ListOfConstraintIndices{F,S}()) for
	(F, S) in MOI.get(src, MOI.ListOfConstraintTypesPresent()) if
	MOI.Utilities._is_variable_function(F) &&
	S != MOI.Parameter{Float64}
	],
	Any[MOI.Utilities._try_constrain_variables_on_creation(
	dest,
	src,
	index_map,
	MOI.Parameter{Float64},
	)],
	)
	else
	Any[
	MOI.Utilities._try_constrain_variables_on_creation(
	dest,
	src,
	index_map,
	S,
	) for S in MOI.Utilities.sorted_variable_sets_by_cost(dest, src)
	]
	end
	MOI.Utilities._copy_free_variables(dest, index_map, vis_src)

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

[odow]

This is effectively a duplicate of #146.

The default_copy_to method hacks around the fact that the NLPBlock models do not support re-ordering parameters by permuting the variable order. So if we remove NLPBlock support (#147), then this method isn't needed.