struct Layout

pub struct Layout :: [OnType]

Conforms to OnType.

Lays the type out as C does, so it crosses into a C function as C's own.

@Layout(C) on a struct keeps its fields in the order they are written, each where the platform's C ABI puts it; its fields are what crosses into C — integers, floats, bool, char, a Ptr, a CStr, another @Layout(C) struct, an inline array of one of them. On an enum without payloads it makes the enum C's enum, an int; @Layout(uint8) and the other integer types make it that integer. The first variant written is 0, the next 1. Without the attribute a type is the compiler's to lay out, and does not cross.