src/polyfill.rs

// Copyright 2015-2016 Brian Smith.
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
// SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
// OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
// CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

//! Polyfills for functionality that will (hopefully) be added to Rust's
//! standard library soon.

#[inline(always)]
pub const fn u64_from_usize(x: usize) -> u64 {
    x as u64
}

pub fn usize_from_u32(x: u32) -> usize {
    x as usize
}

pub mod slice {
    // https://github.com/rust-lang/rust/issues/27750
    // https://internals.rust-lang.org/t/stabilizing-basic-functions-on-arrays-and-slices/2868
    #[inline(always)]
    pub fn fill<T>(dest: &mut [T], value: T)
    where
        T: Copy,
    {
        for d in dest {
            *d = value;
        }
    }
}