1 // Copyright 2014 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 use core::nonzero::NonZero;
14 #[derive(Copy, Clone, Debug, PartialEq, Eq)]
15 pub struct NodeIndex {
20 pub fn new(value: usize) -> NodeIndex {
21 assert!(value < (u32::MAX as usize));
23 NodeIndex { index: NonZero::new((value as u32) + 1) }
27 pub fn get(self) -> usize {
28 (*self.index - 1) as usize