#arithmetic #overflow #nightly

nightly overflower_support

A bunch of specialized traits + impls to allow automated overflow handling without type inference. Nightly only

5 releases

Uses old Rust 2015

0.1.5 Dec 26, 2016
0.1.4 Jul 21, 2016
0.1.3 Jun 24, 2016
0.1.2 Jun 23, 2016
0.1.0 Jun 12, 2016

#660 in Math

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Used in overflower


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This project contains a compiler plugin and supporting library to allow the programmer to annotate their code to declare how integer overflows should be dealt with.


Note: This needs a nightly compiler both for the compiler plugin and the supporting library, as the latter makes use of specialization, which is unstable for now.

To use it, you need the following in your Cargo.toml:

overflower = "0.9"

You may also make it an optional dependency (overflower = { version = "0.4.6", optional = true }).

Next, in your crate root, you need to add:


extern crate overflower_support;

// Now you can annotate items (up to and including the whole crate)
fn panic_on_overflow() { .. }

fn like_you_just_dont_care() { .. }

fn too_much_sunlight() {
    fn but_use_standard_ops_here() { .. }

In case of an optional dependency, you'd add the following instead:

#![cfg_attr(feature="overflower", feature(plugin))]
#![cfg_attr(feature="overflower", plugin(overflower))]

extern crate overflower_support;

// as well as the following instead of e.g. `#[overflow(wrap)]`
#[cfg_attr(feature="overflower", overflow(wrap))];

This is a bit of a work in progress, but most things should already be usable.

License: Apache 2.0

No runtime deps