UE5 C++ TSet 创建初始和迭代

一.TSet定义

把元素本身放入容器，更快速。感觉用的少,并且排序不可靠

都没用到过，后面用到再说，感觉比TArray快，但不会自动排序。

一.创建初始

有点象TArray的感觉

cpp 复制代码

void AWXSetActor::InitSet()
{
	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"));
	// FruitSet == [ "Banana", "Grapefruit", "Pineapple", "Pear" ]
	// Note: Only one banana entry.

	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" ]
}

2.迭代，两种迭代器和 &:

auto,如果明确只知道类型，可以用类型替换。迭代器要多加个*。改引用就是改对应的内存

cpp 复制代码

void AWXSetActor::LoopSet()
{
	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"));
	// FruitSet == [ "Banana", "Grapefruit", "Pineapple", "Pear" ]
	//for (const auto& Elem : FruitSet)  不可修改
	//for(FString& Elem: FruitSet )
	for (auto& Elem : FruitSet)  //可修改原值
	{
		FPlatformMisc::LocalPrint(
			*FString::Printf(
				TEXT(" \"%s\"\n"),
				*Elem
			)
		);
	}
	// Output:
	// 	"Banana"
	// 	"Grapefruit"
	// 	"Pineapple"
	// 	"Pear"
	// 	"Orange"
	// 	"Kiwi"
	// 	"Melon"
	// 	"Mango"
	for (auto It = FruitSet.CreateIterator(); It; ++It)
	{
		*It += TEXT("12");
		FPlatformMisc::LocalPrint(*FString::Printf(TEXT("(%s)\n"), *(*It)));
	}

	for (auto It = FruitSet.CreateConstIterator(); It; ++It)
	{
		FPlatformMisc::LocalPrint(*FString::Printf(TEXT("(%s)\n"),*(*It)));
	}
}