src/test/run-pass/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 // Test slicing sugar.
  12
  13 // pretty-expanded FIXME #23616
  14
  15 #![feature(core)]
  16
  17 extern crate core;
  18 use core::ops::{Index, IndexMut, Range, RangeTo, RangeFrom, RangeFull};
  19
  20 static mut COUNT: usize = 0;
  21
  22 struct Foo;
  23
  24 impl Index<Range<Foo>> for Foo {
  25     type Output = Foo;
  26     fn index(&self, index: Range<Foo>) -> &Foo {
  27         unsafe { COUNT += 1; }
  28         self
  29     }
  30 }
  31 impl Index<RangeTo<Foo>> for Foo {
  32     type Output = Foo;
  33     fn index(&self, index: RangeTo<Foo>) -> &Foo {
  34         unsafe { COUNT += 1; }
  35         self
  36     }
  37 }
  38 impl Index<RangeFrom<Foo>> for Foo {
  39     type Output = Foo;
  40     fn index(&self, index: RangeFrom<Foo>) -> &Foo {
  41         unsafe { COUNT += 1; }
  42         self
  43     }
  44 }
  45 impl Index<RangeFull> for Foo {
  46     type Output = Foo;
  47     fn index(&self, _index: RangeFull) -> &Foo {
  48         unsafe { COUNT += 1; }
  49         self
  50     }
  51 }
  52
  53 impl IndexMut<Range<Foo>> for Foo {
  54     fn index_mut(&mut self, index: Range<Foo>) -> &mut Foo {
  55         unsafe { COUNT += 1; }
  56         self
  57     }
  58 }
  59 impl IndexMut<RangeTo<Foo>> for Foo {
  60     fn index_mut(&mut self, index: RangeTo<Foo>) -> &mut Foo {
  61         unsafe { COUNT += 1; }
  62         self
  63     }
  64 }
  65 impl IndexMut<RangeFrom<Foo>> for Foo {
  66     fn index_mut(&mut self, index: RangeFrom<Foo>) -> &mut Foo {
  67         unsafe { COUNT += 1; }
  68         self
  69     }
  70 }
  71 impl IndexMut<RangeFull> for Foo {
  72     fn index_mut(&mut self, _index: RangeFull) -> &mut Foo {
  73         unsafe { COUNT += 1; }
  74         self
  75     }
  76 }
  77
  78
  79 fn main() {
  80     let mut x = Foo;
  81     &x[..];
  82     &x[Foo..];
  83     &x[..Foo];
  84     &x[Foo..Foo];
  85     &mut x[..];
  86     &mut x[Foo..];
  87     &mut x[..Foo];
  88     &mut x[Foo..Foo];
  89     unsafe {
  90         assert!(COUNT == 8);
  91     }
  92 }