vec_ext.rs - mozsearch

Enable keyboard shortcuts

// Copyright 2019 The Servo Project Developers. See the COPYRIGHT

// file at the top-level directory of this distribution and at

// http://rust-lang.org/COPYRIGHT.

//

// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or

// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license

// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your

// option. This file may not be copied, modified, or distributed

// except according to those terms.

pub trait VecExt  {

    type Item;

    unsafe fn set_end_ptr(&mut self, end: *const Self::Item);

impl<T> VecExt for Vec<T> {

    type Item = T;

    unsafe fn set_end_ptr(&mut self, end: *const T) {

        assert!(end as usize >= self.as_ptr() as usize);

        let new_len = end as usize - self.as_ptr() as usize;

        assert!(new_len <= self.capacity());

        self.set_len(new_len);