iter-enum

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

Usage

Add this to your Cargo.toml:

[dependencies]
iter-enum = "0.2"

Compiler support: requires rustc 1.31+

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(x..=0)
    } else {
        Either::B(Some(x).into_iter())
    }
}

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
  • Enable to use #[derive(ParallelIterator, IndexedParallelIterator, ParallelExtend)].
• trusted_len
  • Enable to use #[derive(TrustedLen)].
  • Note that this feature is unstable and may cause incompatible changes between patch versions.

Related Projects

• auto_enums: A library for to allow multiple return types by automatically generated enum.
• derive_utils: A procedural macro helper for easily writing [derives macros][proc-macro-derive] for enums.
• futures-enum: #[derive(Future, Stream, Sink, AsyncRead, AsyncWrite, AsyncSeek, AsyncBufRead)] for enums.
• io-enum: #[derive(Read, Write, Seek, BufRead)] for enums.

License

Licensed under either of Apache License, Version 2.0 or MIT license at your option.

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.