#vec #length #min #1

no-std vec1

a std Vec wrapper assuring that it has at least 1 element

17 stable releases

1.12.1 May 25, 2024
1.12.0 Mar 27, 2024
1.10.1 Oct 21, 2022
1.8.0 Mar 21, 2021
1.1.0 Jul 24, 2018

#38 in Data structures

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134,017 downloads per month
Used in 132 crates (45 directly)

MIT/Apache

150KB
3K SLoC

vec1 Crates.io vec1 License License

This crate provides a rust std::vec::Vec wrapper with type guarantees to contain at least 1 element. This is useful if you build a API which sometimes has such constraints e.g. you need at least one target server address but there can be more.

Example

#[macro_use]
extern crate vec1;

use vec1::Vec1;

fn main() {
    // vec1![] makes sure there is at least one element
    // at compiler time
    //let names = vec1! [ ];
    let names = vec1! [ "Liz" ];
    greet(names);
}

fn greet(names: Vec1<&str>) {
    // methods like first/last which return a Option on Vec do
    // directly return the value, we know it's possible
    let first = names.first();
    println!("hallo {}", first);
    for name in names.iter().skip(1) {
        println!("  who is also know as {}", name)
    }
}

Support for serde::{Serialize, Deserialize}

The Vec1 type supports both of serde's Serialize and Deserialize traits, but this feature is only enabled when the "serde" feature flag is specified in your project's Cargo.toml file:

# Cargo.toml

[dependencies]
vec1 = { version = "...", features = ["serde"] }

Building docs like on docs.rs

To build docs which document all features and contains hints which functions require which features use following command:

RUSTDOCFLAGS="--cfg docs" cargo +nightly doc --all-features

This will document all features and enable the unstable nightly only doc_auto_cfg feature.

License

Licensed under either of

at your option.

Contribution

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.

Contributors: ./CONTRIBUTORS.md

Change Log

See ./CHANGELOG.md

Dependencies

~180KB