Crate iter_enum 

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

Usage

Add this to your Cargo.toml:

[dependencies]
iter-enum = "1"

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 - example | generated code
• DoubleEndedIterator - example | generated code
• ExactSizeIterator - example | generated code
• FusedIterator - example | generated code
• Extend - example | generated code
• ParallelIterator (requires "rayon" feature) - example | generated code
• IndexedParallelIterator (requires "rayon" feature) - example | generated code
• ParallelExtend (requires "rayon" feature) - example | generated code

Optional features

• rayon
  • Enable to use #[derive(ParallelIterator, IndexedParallelIterator, ParallelExtend)].

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 for enums.
• io-enum: #[derive(Read, Write, Seek, BufRead)] for enums.

Derive Macros

DoubleEndedIterator

ExactSizeIterator

Extend

FusedIterator

IndexedParallelIteratorrayon

Iterator

ParallelExtendrayon

ParallelIteratorrayon