Crate iterator_enum

#[derive(Iterator, DoubleEndedIterator, ExactSizeIterator, FusedIterator, Extend)] for enums.

Examples

use iterator_enum::*;

#[derive(Iterator, DoubleEndedIterator, ExactSizeIterator, FusedIterator, Extend)]
enum Either<A, B> {
    A(A),
    B(B),
}

fn foo(x: i32) -> impl Iterator<Item = i32> {
    if x > 0 {
        Either::A(x..=0)
    } else {
        Either::B(Some(x).into_iter())
    }
}

See auto_enums for how to automate patterns like this.

Supported traits

• Iterator - generated code
• DoubleEndedIterator - generated code
• ExactSizeIterator - generated code
• FusedIterator - generated code
• TrustedLen - generated code (requires "trusted_len" crate feature)
• Extend - generated code

Crate Features

• try_trait

  • Disabled by default.
  • Make iterator implementation more effective.
  • This requires Rust Nightly and you need to enable the unstable try_trait feature gate.

• trusted_len

  • Disabled by default.
  • Use #[derive(TrustedLen)].
  • This requires Rust Nightly and you need to enable the unstable trusted_len feature gate.

• exact_size_is_empty

  • Disabled by default.
  • Implements ExactSizeIterator::is_empty.
  • This requires Rust Nightly and you need to enable the unstable exact_size_is_empty feature gate.

Derive Macros

DoubleEndedIterator
ExactSizeIterator
Extend
FusedIterator
Iterator