Soapy

Soapy is a structure-of-arrays derive macro. It creates an Soa type that behaves like a Vec except that the elements of each field are stored in separate arrays. This has several advantages:

• No need for alignment-related padding, resulting in a more compact memory layout
• Improved locality when iterating over a subset of the struct's fields
• Plays nicely with auto-vectorization as elements can be trivially loaded into SIMD vectors without swizzling

Unlike other SOA crates, Soapy builds on stable and uses a single allocation to store the arrays of each field, rather than using separate Vecs for each field.