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Manual Duration::{as_nanos,as_milis,as_secs_f64,as_secs_f32} implementation #6068

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@est31

Description

@est31

What it does

Recognize cases of manual re-implementation of the builtin as_nanos and as_secs_f64 and as_secs_f32 functions on Duration.

Categories

  • Kind: complexity, sometimes also correctness

Drawbacks

MSRV issues, implementing the suggestion might increase the MSRV.

Example

let nanos = diff.as_secs() * 1_000_000_000 + diff.subsec_nanos() as u64;
let milis = diff.as_secs() * 1_000 + diff.subsec_milis() as u64;
let secs_f64 = (diff.as_secs() as f64 * 1_000.0 + diff.subsec_milis() as f64) / 1000.0;
let secs_f64 = diff.as_secs() as f64 + diff.subsec_milis() as f64 / 1_000.0;
let secs_f64 = diff.as_secs() as f64 + diff.subsec_nanos() as f64 / 1_000_000_000.0;

Could be written as:

let nanos = diff.as_nanos() as u64;
let milis = diff.as_millis() as u64;
let secs_f64 = diff.as_secs_f64();
let secs_f64 = diff.as_secs_f64();
let secs_f64 = diff.as_secs_f64();

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C-enhancementCategory: Enhancement of lints, like adding more cases or adding help messagesgood-first-issueThese issues are a good way to get started with Clippy

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