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28 lines
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=========================================
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Swift and Objective-C Runtime Differences
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=========================================
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This document tracks the differences between the Swift and Objective-C runtimes.
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Customized Allocation Logic
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===========================
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Overriding +allocWithZone and +alloc in Objective-C classes that inherit from
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Swift classes is not supported and will likely crash.
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Proxying
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========
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Swift classes do not support proxying. Proxying in Swift works if and only if
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one does a cast to an Objective-C type.
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Alignment
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=========
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In very rare scenarios, Swift classes allocated in Objective-C code may not be
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correctly aligned. This is a bug but not a regression from Objective-C.
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Workaround: do not use types that require more than 16-byte alignment as
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class instance variables.
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