'宣言 Public MustOverride Function _filter( _ ByVal arr As List(Of T) _ ) As List(Of T)
'宣言
Public MustOverride Function _filter( _ ByVal arr As List(Of T) _ ) As List(Of T)
public abstract List<T> _filter( List<T> arr )
ConditionalFilter<T> クラス ConditionalFilter<T> メンバ