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Imported Upstream version 1.9.0+dfsg1
[rustc.git] / src / librustc_data_structures / obligation_forest / tree_index.rs
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1a4d82fc 1// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
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2// file at the top-level directory of this distribution and at
3// http://rust-lang.org/COPYRIGHT.
4//
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.
10
7453a54e 11use std::u32;
1a4d82fc 12
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13#[derive(Copy, Clone, Debug, PartialEq, Eq)]
14pub struct TreeIndex {
54a0048b 15 index: u32,
7453a54e 16}
223e47cc 17
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18impl TreeIndex {
19 pub fn new(value: usize) -> TreeIndex {
20 assert!(value < (u32::MAX as usize));
21 TreeIndex { index: value as u32 }
223e47cc 22 }
223e47cc 23
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24 pub fn get(self) -> usize {
25 self.index as usize
26 }
223e47cc 27}