How to declare #pragma pack (1) in swift

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C

Mobile

iPhone

Objective-C

iOS

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I'm trying to rewrite an iOS app from objective c into swift.
I'm using serialization in order to send data over some sort of communication layer.
In objective c I used #pragma pack (1) at the top of each struct in order to use sequential layout without padding between the data members.
I tried to use PRAGMA_STRUCT_PACK at the top of the struct.
It seems to work at the playground, but when implementing it in my app, I got an error message saying: "Expressions are not allowed at the top level".