Risk-measure ↔ optimiser compatibility: private API
PortfolioOptimisers._child_category — Function
_child_category(T::Type)Return the risk-measure category accepted by a meta-optimiser child of type T, or Union{} when T is not an optimiser (e.g. an abstract or erased child field type). Used by the type-level meta-optimiser methods of supported_risk_measures to intersect the categories of their inner/outer optimisers.
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