src/test/ui/run-pass/array-slice-vec/slice.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 // run-pass
  12
  13 // Test slicing sugar.
  14
  15 extern crate core;
  16 use core::ops::{Index, IndexMut, Range, RangeTo, RangeFrom, RangeFull};
  17
  18 static mut COUNT: usize = 0;
  19
  20 struct Foo;
  21
  22 impl Index<Range<Foo>> for Foo {
  23     type Output = Foo;
  24     fn index(&self, index: Range<Foo>) -> &Foo {
  25         unsafe { COUNT += 1; }
  26         self
  27     }
  28 }
  29 impl Index<RangeTo<Foo>> for Foo {
  30     type Output = Foo;
  31     fn index(&self, index: RangeTo<Foo>) -> &Foo {
  32         unsafe { COUNT += 1; }
  33         self
  34     }
  35 }
  36 impl Index<RangeFrom<Foo>> for Foo {
  37     type Output = Foo;
  38     fn index(&self, index: RangeFrom<Foo>) -> &Foo {
  39         unsafe { COUNT += 1; }
  40         self
  41     }
  42 }
  43 impl Index<RangeFull> for Foo {
  44     type Output = Foo;
  45     fn index(&self, _index: RangeFull) -> &Foo {
  46         unsafe { COUNT += 1; }
  47         self
  48     }
  49 }
  50
  51 impl IndexMut<Range<Foo>> for Foo {
  52     fn index_mut(&mut self, index: Range<Foo>) -> &mut Foo {
  53         unsafe { COUNT += 1; }
  54         self
  55     }
  56 }
  57 impl IndexMut<RangeTo<Foo>> for Foo {
  58     fn index_mut(&mut self, index: RangeTo<Foo>) -> &mut Foo {
  59         unsafe { COUNT += 1; }
  60         self
  61     }
  62 }
  63 impl IndexMut<RangeFrom<Foo>> for Foo {
  64     fn index_mut(&mut self, index: RangeFrom<Foo>) -> &mut Foo {
  65         unsafe { COUNT += 1; }
  66         self
  67     }
  68 }
  69 impl IndexMut<RangeFull> for Foo {
  70     fn index_mut(&mut self, _index: RangeFull) -> &mut Foo {
  71         unsafe { COUNT += 1; }
  72         self
  73     }
  74 }
  75
  76
  77 fn main() {
  78     let mut x = Foo;
  79     &x[..];
  80     &x[Foo..];
  81     &x[..Foo];
  82     &x[Foo..Foo];
  83     &mut x[..];
  84     &mut x[Foo..];
  85     &mut x[..Foo];
  86     &mut x[Foo..Foo];
  87     unsafe {
  88         assert_eq!(COUNT, 8);
  89     }
  90 }