library/alloc/tests/lib.rs

   1 #![feature(allocator_api)]
   2 #![feature(box_syntax)]
   3 #![feature(btree_drain_filter)]
   4 #![feature(drain_filter)]
   5 #![feature(exact_size_is_empty)]
   6 #![feature(map_first_last)]
   7 #![feature(new_uninit)]
   8 #![feature(pattern)]
   9 #![feature(str_split_once)]
  10 #![feature(trusted_len)]
  11 #![feature(try_reserve)]
  12 #![feature(unboxed_closures)]
  13 #![feature(associated_type_bounds)]
  14 #![feature(binary_heap_into_iter_sorted)]
  15 #![feature(binary_heap_drain_sorted)]
  16 #![feature(split_inclusive)]
  17 #![feature(binary_heap_retain)]
  18
  19 use std::collections::hash_map::DefaultHasher;
  20 use std::hash::{Hash, Hasher};
  21
  22 mod arc;
  23 mod binary_heap;
  24 mod borrow;
  25 mod boxed;
  26 mod btree;
  27 mod cow_str;
  28 mod fmt;
  29 mod heap;
  30 mod linked_list;
  31 mod rc;
  32 mod slice;
  33 mod str;
  34 mod string;
  35 mod vec;
  36 mod vec_deque;
  37
  38 fn hash<T: Hash>(t: &T) -> u64 {
  39     let mut s = DefaultHasher::new();
  40     t.hash(&mut s);
  41     s.finish()
  42 }
  43
  44 // FIXME: Instantiated functions with i128 in the signature is not supported in Emscripten.
  45 // See https://github.com/kripken/emscripten-fastcomp/issues/169
  46 #[cfg(not(target_os = "emscripten"))]
  47 #[test]
  48 fn test_boxed_hasher() {
  49     let ordinary_hash = hash(&5u32);
  50
  51     let mut hasher_1 = Box::new(DefaultHasher::new());
  52     5u32.hash(&mut hasher_1);
  53     assert_eq!(ordinary_hash, hasher_1.finish());
  54
  55     let mut hasher_2 = Box::new(DefaultHasher::new()) as Box<dyn Hasher>;
  56     5u32.hash(&mut hasher_2);
  57     assert_eq!(ordinary_hash, hasher_2.finish());
  58 }