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Structs can be a great way to keep the garbage collector off your back and to use the CPU’s data cache more effectively. Not everything can be a struct though. At a minimum, you’ll need to use some Unity and .NET classes like MonoBehaviour and string. If your struct has any of these as fields, you can no longer use sizeof(MyStruct). That really limits its usefulness, so a workaround is needed. Enter object handles: a simple way to represent any object as a plain old int which won’t break sizeof. Read on to see how these work and some code you can easily drop into your project to start using them right away!

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