Crate iter_enum

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

Examples

use iter_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(0..=x) } else { Either::B(std::iter::empty()) }
}

See auto_enums crate for how to automate patterns like this.

Supported traits

• Iterator - generated code
• DoubleEndedIterator - generated code
• ExactSizeIterator - generated code
• FusedIterator - generated code
• Extend - generated code
• TrustedLen - generated code (requires "trusted_len" feature)
• ParallelIterator - generated code (requires "rayon" feature)
• IndexedParallelIterator - generated code (requires "rayon" feature)
• ParallelExtend - generated code (requires "rayon" feature)

Optional features

• rayon

  • Disabled by default.
  • Enable to use #[derive(ParallelIterator, IndexedParallelIterator, ParallelExtend)].

• trusted_len

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

Derive Macros

DoubleEndedIterator
ExactSizeIterator
Extend
FusedIterator
IndexedParallelIterator
Iterator
ParallelExtend
ParallelIterator
TrustedLen