Clippy lint · Complexity · checked with Clippy 0.1.99

clippy::manual_is_multiple_of: Checks for manual implementation of .is_multiple_of() on unsigned integer types

What it meansChecks for manual implementation of .is_multiple_of() on unsigned integer types. It is in the complexity group and warns by default.

Does it matter?

a.is_multiple_of(b) is a clearer way to check for divisibility of a by b. This expression can never panic.

Code that does something simple in a complicated way. Warns by default.

How to fix it

Clippy can fix this one for you: run cargo clippy --fix (add --allow-dirty if you have uncommitted changes). Review the diff before you commit.

Flagged

if a % b == 0 {
    println!("{a} is divisible by {b}");
}

Write this instead

if a.is_multiple_of(b) {
    println!("{a} is divisible by {b}");
}

Turn it off, or on

Allow it where it does not fit your code, as narrowly as you can:

On one item

#[allow(clippy::manual_is_multiple_of)]
fn my_function() { /* ... */ }

Whole crate (Cargo.toml)

[lints.clippy]
manual_is_multiple_of = "allow"

One run

cargo clippy -- -A clippy::manual-is-multiple-of

The [lints] table needs Rust 1.74 or newer. In a workspace, put it under [workspace.lints.clippy] and add [lints] workspace = true to each member.

Complexitygroup

warndefault level

yesfixed by cargo clippy --fix

1.90.0added in Rust

Clippy's own documentation

What it does

Checks for manual implementation of .is_multiple_of() on unsigned integer types.

Why is this bad?

a.is_multiple_of(b) is a clearer way to check for divisibility of a by b. This expression can never panic.

Example

if a % b == 0 {
    println!("{a} is divisible by {b}");
}

Use instead:

if a.is_multiple_of(b) {
    println!("{a} is divisible by {b}");
}

From the Clippy lint list (0.1.99), part of the Rust project, MIT or Apache-2.0. Official entry.

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