result-ext

Introduction

This crate extends Result with additional methods, currently:

• contains
• contains_err
• map_or2 (as a replacement for map_or)
• map_or_else2 (as a replacement for map_or_else)

Its sister crate is option-ext, which extends Option.

Requirements

Rust 1.0 or newer.

Usage

Dependency

Add the library as a dependency to your project by inserting

toml result-ext = "0.2.0"

into the [dependencies] section of your Cargo.toml file.

Example

```rust use result_ext::ResultExt;

fn examplecontains() { use resultext::ResultExt;

let x: Result<u32, &str> = Ok(2);
assert_eq!(x.contains(&2), true);

let x: Result<u32, &str> = Ok(3);
assert_eq!(x.contains(&2), false);

let x: Result<u32, &str> = Err("Some error message");
assert_eq!(x.contains(&2), false);

}

fn examplecontainserr() { let x: Result = Ok(2); asserteq!(x.containserr(&"Some error message"), false);

let x: Result<u32, &str> = Err("Some error message");
assert_eq!(x.contains_err(&"Some error message"), true);

let x: Result<u32, &str> = Err("Some other error message");
assert_eq!(x.contains_err(&"Some error message"), false);

}

fn examplemapor2() { let x: Result<_, &str> = Ok("foo"); asserteq!(x.mapor2(|v| v.len(), 23), 3);

let x: Result<&str, _> = Err("bar");
assert_eq!(x.map_or2(|v| v.len(), 23), 23);

}

fn examplemapor_else2() { let k = 23;

let x : Result<_, &str> = Ok("foo");
assert_eq!(x.map_or_else2(|v| v.len(), |e| k * 2), 3);

let x : Result<&str, _> = Err("bar");
assert_eq!(x.map_or_else2(|v| v.len(), |e| k * 2), 46);

} ```