Swift Imports Fixed-size C Arrays As Tuples
The Swift equivalent of the C type
float[4]would be(Float, Float, Float, Float). This has the benefit of incurring no bridging overhead because the Swift compiler can lay out tuples in a C-compatible way.[…]
Swift’s Clang importer sees the
char[256]declarations and turns them into 256-tuples(!).[…]
I did a quick test: my version of
_FixedArray256(approximately 1,600 lines of generated Swift code) takes about 8 seconds to compile and adds nearly 750 KB to the compiled binary (with optimizations enabled). The convenience doesn’t come for free.[…]
Instead, let’s just take the idea of obtaining a pointer to the tuple’s storage and using that to initialize a string.
