mirror of https://github.com/rust-lang/rust
65 lines
1.1 KiB
Rust
65 lines
1.1 KiB
Rust
//@ run-pass
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use std::ops::{Index, IndexMut};
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struct Foo {
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x: isize,
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y: isize,
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}
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impl Index<isize> for Foo {
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type Output = isize;
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fn index(&self, z: isize) -> &isize {
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if z == 0 {
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&self.x
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} else {
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&self.y
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}
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}
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}
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impl IndexMut<isize> for Foo {
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fn index_mut(&mut self, z: isize) -> &mut isize {
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if z == 0 {
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&mut self.x
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} else {
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&mut self.y
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}
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}
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}
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trait Int {
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fn get(self) -> isize;
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fn get_from_ref(&self) -> isize;
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fn inc(&mut self);
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}
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impl Int for isize {
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fn get(self) -> isize { self }
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fn get_from_ref(&self) -> isize { *self }
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fn inc(&mut self) { *self += 1; }
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}
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fn main() {
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let mut f = Foo {
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x: 1,
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y: 2,
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};
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assert_eq!(f[1], 2);
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f[0] = 3;
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assert_eq!(f[0], 3);
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{
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let p = &mut f[1];
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*p = 4;
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}
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{
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let p = &f[1];
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assert_eq!(*p, 4);
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}
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// Test calling methods with `&mut self`, `self, and `&self` receivers:
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f[1].inc();
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assert_eq!(f[1].get(), 5);
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assert_eq!(f[1].get_from_ref(), 5);
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}
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