Crate from_variants [−] [src]
Rust macro crate to automatically generate conversions from variant types into the target enum.
This crate requires Rust 1.15 or above to compile on stable.
Examples
#[macro_use] extern crate from_variants; #[derive(Debug, Clone, PartialEq, Eq, FromVariants)] pub enum Lorem { Str(String), Num(u16), } fn main() { assert_eq!(Lorem::Num(10), Lorem::from(10)); }
You can skip variants to avoid type collisions:
#[macro_use] extern crate from_variants; #[derive(Debug, Clone, PartialEq, Eq, FromVariants)] pub enum Ipsum { Hello(String), #[from_variants(skip)] Goodbye(String), } fn main() { assert_eq!(Ipsum::Hello("John".to_string()), Ipsum::from("John".to_string())); }
Features
- Variant opt-out: To skip a variant, add
#[from_variants(skip)]
to that variant. - Conversion opt-in: Use
#[from_variants(into)]
on an enum or variant to generate conversions that will automatically convert - for example, accepting a&str
for aString
variant. This must be used sparingly to avoid generating conflicting impls.
Re-exports
pub use from_variants_impl::*; |