Convert enum to struct assist #21612
Description
This is useful for hiding enum variants from a public API.
e.g.
#[derive(Copy, Clone, Debug)]
pub enum Something {
Foo,
Bar(u32),
}
fn foo(s: &Something) -> u32 {
match s {
Something::Foo => 0,
Something::Bar(value) => value,
}
}
fn bar() -> Something {
Something::Foo
}to
#[derive(Copy, Clone, Debug)]
#[repr(transparent)] // In case of transmute shenanigans
pub struct Something {
kind: SomethingKind,
}
// Duplicates basic derives (can't duplicate all because it may change semantics, e.g. serde)
#[derive(Copy, Clone, Debug)]
enum SomethingKind {
Foo,
Bar(u32),
}
fn foo(s: &Something) -> u32 {
match &s.kind {
Something::Foo => 0,
Something::Bar(value) => value,
}
}
fn bar() -> Something {
Something { kind: SomethingKind::Foo }
}