src/test/run-pass/default_ty_param_struct_and_type_alias.rs

   1 // Copyright 2015 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
  12 #![feature(default_type_parameter_fallback)]
  13
  14 use std::marker::PhantomData;
  15
  16 struct DeterministicHasher;
  17 struct RandomHasher;
  18
  19
  20 struct MyHashMap<K, V, H=DeterministicHasher> {
  21     data: PhantomData<(K, V, H)>
  22 }
  23
  24 impl<K, V, H> MyHashMap<K, V, H> {
  25     fn new() -> MyHashMap<K, V, H> {
  26         MyHashMap { data: PhantomData }
  27     }
  28 }
  29
  30 mod mystd {
  31     use super::{MyHashMap, RandomHasher};
  32     pub type HashMap<K, V, H=RandomHasher> = MyHashMap<K, V, H>;
  33 }
  34
  35 fn try_me<H>(hash_map: mystd::HashMap<i32, i32, H>) {}
  36
  37 fn main() {
  38     let hash_map = mystd::HashMap::new();
  39     try_me(hash_map);
  40 }