https://github.com/emmiegit/rust-ref-map

Helper trait with convenience methods for mapping references of Option and Result.
https://github.com/emmiegit/rust-ref-map

borrowing references rust traits

Last synced: 3 months ago
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Helper trait with convenience methods for mapping references of Option and Result.

• Host: GitHub
• URL: https://github.com/emmiegit/rust-ref-map
• Owner: emmiegit
• License: mit
• Created: 2020-01-26T05:18:24.000Z (over 5 years ago)
• Default Branch: master
• Last Pushed: 2023-03-19T04:24:18.000Z (over 2 years ago)
• Last Synced: 2025-02-28T07:51:40.299Z (4 months ago)
• Topics: borrowing, references, rust, traits
• Language: Rust
• Size: 20.5 KB
• Stars: 1
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE.md

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README

        
## ref-map

[![Build Status](https://travis-ci.org/emmiegit/rust-ref-map.svg?branch=master)](https://travis-ci.org/emmiegit/rust-ref-map)

Rust crate for convenience traits on `Option` and `Result`.

Has no dependencies, and should work on any Rust release channel.

Three methods are provided, `ref_map()` for `Some(_)` and `Ok(_)`, and `ref_map_err()` for `Err(_)`.

This allows easily mapping borrowed values from maybe values.

```rust

use ref_map::*;

let string: Option = Some("hello world\n".into());

// Without ref-map:

// the .as_ref() is necessary because otherwise it tries to consume the String

let message: Option<&str> = string.as_ref().map(|s| s.trim());

// With ref-map:

let message: Option<&str> = string.ref_map(|s| s.trim());

```

`ref_map()` is also provided for `Result` for `Ok`, and `ref_map_err()` for `Err`.

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Copyright (C) 2020-2021 Ammon Smith

Available under the MIT License.