57 lines
1.3 KiB
Markdown
57 lines
1.3 KiB
Markdown
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# Abstract
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- **功能描述：** 标识该FRigUnit为抽象类，不用实现Execute。
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- **使用位置：** USTRUCT
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- **引擎模块：** RigVMStruct
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- **元数据类型：** bool
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- **限制类型：** FRigUnit类型上
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- **常用程度：** ★★
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标识该FRigUnit为抽象类，不用实现Execute，常常用作别的FRigUnit类的基类使用。
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但如果还是实现了Execute，其实也还是可以在蓝图中调用的。
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## 测试代码：
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```cpp
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USTRUCT(meta = (DisplayName = "MyRigAbstract",Abstract))
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struct INSIDER_API FRigUnit_MyRigAbstract: public FRigUnit
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{
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GENERATED_BODY()
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public:
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UPROPERTY(meta = (Input))
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float MyFloat_Input = 123.f;
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UPROPERTY(meta = (Output))
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float MyFloat_Output = 123.f;
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};
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```
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## 测试效果：
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## 原理：
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在一些内部处理的时候，当然会略过这种抽象基类。
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```cpp
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void FRigVMBlueprintUtils::ForAllRigVMStructs(TFunction<void(UScriptStruct*)> InFunction)
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{
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// Run over all unit types
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for(TObjectIterator<UStruct> StructIt; StructIt; ++StructIt)
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{
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if (*StructIt)
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{
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if(StructIt->IsChildOf(FRigVMStruct::StaticStruct()) && !StructIt->HasMetaData(FRigVMStruct::AbstractMetaName))
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{
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if (UScriptStruct* ScriptStruct = Cast<UScriptStruct>(*StructIt))
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{
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InFunction(ScriptStruct);
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}
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}
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}
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}
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}
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```
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