Derive Macro Pod 

#[derive(Pod)]

Derive macro for the Pod trait.

The type is checked for requirements of the Pod trait:

• Must be annotated with #[repr(C)] or #[repr(transparent)].
• Must have every field’s type implement Pod itself.
• Must not have any padding between its fields, define dummy fields to cover the padding.

Note that it is legal for pod types to be a ZST.

Compile errors

Error reporting is not very ergonomic due to how errors are detected:

• error[E0277]: the trait bound $TYPE: Pod is not satisfied

  The struct contains a field whose type does not implement Pod.

• error[E0512]: cannot transmute between types of different sizes, or dependently-sized types

  This error means your struct has padding as its size is not equal to a byte array of length equal to the sum of the size of its fields.

• error: cannot implement Pod for type $TYPE

  Deriving Pod is not supported for this type.

  This includes enums, unions and structs with generics or lifetimes.