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FStrings are UE4's version of C++'s <string> type. When programming in UE4, you should use the FString objects over C++ STL's string objects. In general, you should preferably use UE4's built-in types, as they guarantee cross-platform compatibility.

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Cover of Learning C++ by Creating Games with UE4

Note

使用ue4提供的模板类型,以便跨平台。string使用FString