iter-enum

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

Usage

Add this to your Cargo.toml:

[dependencies]
iter-enum = "0.2"

The current iter-enum requires Rust 1.31 or later.

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)

License

Licensed under either of

Apache License, Version 2.0, (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Contribution