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23 lines
448 B
Dart
23 lines
448 B
Dart
// ignore_for_file: prefer_final_fields
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abstract class TimeSeq<T extends TimeSeqIface> {
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List<T> pre;
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List<T> now;
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void update(List<T> new_) {
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pre = now;
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now = new_;
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if (pre.length != now.length) {
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pre.removeWhere((e) => now.any((el) => e.same(el)));
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pre.addAll(now.where((e) => pre.every((el) => !e.same(el))));
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}
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}
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TimeSeq(this.pre, this.now);
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}
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abstract class TimeSeqIface<T> {
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bool same(T other);
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}
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