src/test/auxiliary/go_trait.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 #![feature(specialization)]
  12
  13 // Common code used for tests that model the Fn/FnMut/FnOnce hierarchy.
  14
  15 pub trait Go {
  16     fn go(&self, arg: isize);
  17 }
  18
  19 pub fn go<G:Go>(this: &G, arg: isize) {
  20     this.go(arg)
  21 }
  22
  23 pub trait GoMut {
  24     fn go_mut(&mut self, arg: isize);
  25 }
  26
  27 pub fn go_mut<G:GoMut>(this: &mut G, arg: isize) {
  28     this.go_mut(arg)
  29 }
  30
  31 pub trait GoOnce {
  32     fn go_once(self, arg: isize);
  33 }
  34
  35 pub fn go_once<G:GoOnce>(this: G, arg: isize) {
  36     this.go_once(arg)
  37 }
  38
  39 impl<G> GoMut for G
  40     where G : Go
  41 {
  42     default fn go_mut(&mut self, arg: isize) {
  43         go(&*self, arg)
  44     }
  45 }
  46
  47 impl<G> GoOnce for G
  48     where G : GoMut
  49 {
  50     default fn go_once(mut self, arg: isize) {
  51         go_mut(&mut self, arg)
  52     }
  53 }