Trait AssertSomeExt

pub trait AssertSomeExt {
    // Required methods
    fn assert_some(self) -> Self;
    fn debug_assert_some(self) -> Self;
}

Expand description

An extension trait to add the assertion_some methods.

Required Methods§

Asserts the Option is Some.

If it is None, the method panics.

use chain_assertions::prelude::*;

let x: Option<i32> = Some(21);
let x = x.assert_some().map(|x| x * 2);
assert_eq!(x, Some(42));

use chain_assertions::prelude::*;

let x: Option<i32> = None;
let _ = x.assert_some().map(|x| x * 2);
//        ^-- panics here

Asserts the Option is Some only in debug builds.

The method panics if all following conditions are satisfied:

Otherwise, the method returns self as is.

use chain_assertions::prelude::*;

let x: Option<i32> = Some(21);
let x = x.debug_assert_some().map(|x| x * 2);
assert_eq!(x, Some(42));

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".