TSet

데이터 값 자체를 키로 사용하는 컨테이너. 엘리먼트 추가, 검색, 제거가 매우 빠름.

 

TSet<FString> FruitSet;
FruitSet.Add(TEXT("Banana"));
FruitSet.Add(TEXT("Grapefruit"));
FruitSet.Add(TEXT("Pineapple"));
// FruitSet == [ "Banana", "Grapefruit", "Pineapple" ]

FruitSet.Add(TEXT("Pear"));
FruitSet.Add(TEXT("Banana")); // 중복 허용 안함.
// FruitSet == [ "Banana", "Grapefruit", "Pineapple", "Pear" ]

FruitSet.Emplace(TEXT("Orange"));
// FruitSet == [ "Banana", "Grapefruit", "Pineapple", "Pear", "Orange" ]

TSet<FString> FruitSet2;
FruitSet2.Emplace(TEXT("Kiwi"));
FruitSet2.Emplace(TEXT("Melon"));
FruitSet2.Emplace(TEXT("Mango"));
FruitSet2.Emplace(TEXT("Orange"));
FruitSet.Append(FruitSet2);
// FruitSet == [ "Banana", "Grapefruit", "Pineapple", "Pear", "Orange", "Kiwi", "Melon", "Mango" ]

for (auto& Elem : FruitSet)
{
    FPlatformMisc::LocalPrint(
        *FString::Printf(
            TEXT(" \"%s\"\n"),
            *Elem
        )
    );
}

for (auto It = FruitSet.CreateConstIterator(); It; ++It)
{
    FPlatformMisc::LocalPrint(
        *FString::Printf(
            TEXT("(%s)\n"),
            *It
        )
    );
}
// Output:
//  "Banana"
//  "Grapefruit"
//  "Pineapple"
//  "Pear"
//  "Orange"
//  "Kiwi"
//  "Melon"
//  "Mango"

int32 Count = FruitSet.Num(); // Count == 8

bool bHasBanana = FruitSet.Contains(TEXT("Banana")); // bHasBanana == true
bool bHasLemon = FruitSet.Contains(TEXT("Lemon")); // bHasLemon == false



FSetElementId BananaIndex = FruitSet.Index(TEXT("Banana"));
// BananaIndex is a value between 0 and (FruitSet.Num() - 1)
FPlatformMisc::LocalPrint(
    *FString::Printf(
        TEXT(" \"%s\"\n"),
        *FruitSet[BananaIndex]
    )
); // Prints "Banana"

FString* PtrBanana = FruitSet.Find(TEXT("Banana")); // *PtrBanana == "Banana"
FString* PtrLemon = FruitSet.Find(TEXT("Lemon")); // PtrLemon == nullptr

FruitSet.Remove(0); // FruitSet == [ "Grapefruit","Pineapple","Pear","Orange","Kiwi","Melon","Mango" ]

int32 RemovedAmountPineapple = FruitSet.Remove(TEXT("Pineapple")); // RemovedAmountPineapple == 1
// FruitSet == [ "Grapefruit","Pear","Orange","Kiwi","Melon","Mango" ]
FString RemovedAmountLemon = FruitSet.Remove(TEXT("Lemon")); // RemovedAmountLemon == 0

TSet<FString> FruitSetCopy = FruitSet; // FruitSetCopy == [ "Grapefruit","Pear","Orange","Kiwi","Melon","Mango" ]

FruitSetCopy.Empty(); // FruitSetCopy == []

// 소팅.
FruitSet.Sort([](const FString& A, const FString& B) {
    return A.Len() < B.Len(); // 단어의 길이가 짧은 것부터.
});
// FruitSet == [ "Pear", "Kiwi", "Melon", "Mango", "Orange", "Grapefruit" ]​