MQL5 リファレンス標準ライブラリジェネリックデータコレクションCHashSet<T>Clear AddCountContainsComparerTrimExcessCopyToClearRemoveExceptWithIntersectWithSymmetricExceptWithUnionWithIsProperSubsetOfIsProperSupersetOfIsSubsetOfIsSupersetOfOverlapsSetEquals Clear 집합에서 모든 요소를 제거. void Clear(); CopyTo Remove