memsizes

Type-safe memory size newtypes for Rust with checked conversions and arithmetic.

Stop mixing up bytes and mebibytes, or accidentally passing a decimal gigabyte where a binary one was expected. memsizes gives each unit its own type so the compiler catches the mistakes for you.

Units

Usage

use memsizes::{GiB, MiB, MB, MemorySize, Rounding};

let mem = GiB::from_units(2);

// Exact conversion (binary → binary)
let mib: MiB = mem.to_exact::<MiB>().unwrap();
assert_eq!(mib.units(), 2048);

// Rounded conversion (binary → decimal)
let mb = mem.to_rounded::<MB>(Rounding::Ceil).unwrap();

// Checked arithmetic
let total = mib.checked_add(MiB::from_units(512)).unwrap();
assert_eq!(total.units(), 2560);

All conversions go through Bytes internally and use checked arithmetic — overflows return errors instead of wrapping.

Features

• Zero-cost newtypes over u64
• Compile-time unit safety between binary and decimal sizes
• Exact conversions (to_exact) and rounded conversions (to_rounded) with floor/ceil/nearest modes
• Checked and saturating add/sub
• Serde support out of the box

License

MIT