src/librustc_data_structures/obligation_forest/tree_index.rs

   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.
   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
  11 use std::u32;
  12
  13 #[derive(Copy, Clone, Debug, PartialEq, Eq)]
  14 pub struct TreeIndex {
  15     index: u32,
  16 }
  17
  18 impl TreeIndex {
  19     pub fn new(value: usize) -> TreeIndex {
  20         assert!(value < (u32::MAX as usize));
  21         TreeIndex { index: value as u32 }
  22     }
  23
  24     pub fn get(self) -> usize {
  25         self.index as usize
  26     }
  27 }