78 lines
2.3 KiB
Markdown
78 lines
2.3 KiB
Markdown
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# SetParam
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- **功能描述：** 指定一个函数为使用Set<TItem>的函数，元素类型为通配符的泛型。
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- **使用位置：** UFUNCTION
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- **引擎模块：** Blueprint
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- **元数据类型：** string="A | B | C"
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- **限制类型：** TSet
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- **常用程度：** ★★★
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源码在UBlueprintSetLibrary。
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SetParam支持多个Set和元素参数，以‘,’分隔开，然后Pin的引脚可以通过‘|’继续分隔，形成”SetA | ItemA, SetB | ItemB”的多组数据。
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## 测试代码：
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```cpp
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UFUNCTION(BlueprintCallable, CustomThunk, meta = (SetParam = "SetA|ItemA,SetB|ItemB"))
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static void MySet_Add2(const TSet<int32>& SetA, const int32& ItemA, const TSet<int32>& SetB, const int32& ItemB);
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static void GenericMySet_Add2(const void* TargetSet, const FSetProperty* SetA, const void* ItemA, const FSetProperty* SetB, const void* ItemB);
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DECLARE_FUNCTION(execMySet_Add2);
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```
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## 蓝图里效果：
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## 原理：
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用‘,’分隔的是组，组内用’|’分隔的参数Pin都是同一种类型的。
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```cpp
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void UK2Node_CallFunction::ConformContainerPins()
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{
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// find any pins marked as SetParam
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const FString& SetPinMetaData = TargetFunction->GetMetaData(FBlueprintMetadata::MD_SetParam);
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// useless copies/allocates in this code, could be an optimization target...
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TArray<FString> SetParamPinGroups;
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{
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SetPinMetaData.ParseIntoArray(SetParamPinGroups, TEXT(","), true);
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}
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for (FString& Entry : SetParamPinGroups)
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{
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// split the group:
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TArray<FString> GroupEntries;
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Entry.ParseIntoArray(GroupEntries, TEXT("|"), true);
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// resolve pins
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TArray<UEdGraphPin*> ResolvedPins;
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for(UEdGraphPin* Pin : Pins)
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{
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if (GroupEntries.Contains(Pin->GetName()))
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{
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ResolvedPins.Add(Pin);
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}
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}
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// if nothing is connected (or non-default), reset to wildcard
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// else, find the first type and propagate to everyone else::
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bool bReadyToPropagatSetType = false;
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FEdGraphTerminalType TypeToPropagate;
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for (UEdGraphPin* Pin : ResolvedPins)
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{
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TryReadTypeToPropagate(Pin, bReadyToPropagatSetType, TypeToPropagate);
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if(bReadyToPropagatSetType)
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{
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break;
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}
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}
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for (UEdGraphPin* Pin : ResolvedPins)
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{
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TryPropagateType( Pin, TypeToPropagate, bReadyToPropagatSetType );
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}
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}
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}
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```
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