50 lines
1.1 KiB
Rust
50 lines
1.1 KiB
Rust
// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
|
|
// file at the top-level directory of this distribution and at
|
|
// http://rust-lang.org/COPYRIGHT.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
|
|
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
|
|
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
|
|
// option. This file may not be copied, modified, or distributed
|
|
// except according to those terms.
|
|
|
|
struct Point {
|
|
x: int,
|
|
y: int,
|
|
}
|
|
|
|
fn a() {
|
|
let mut p = vec!(1);
|
|
|
|
// Create an immutable pointer into p's contents:
|
|
let q: &int = &p[0];
|
|
|
|
p[0] = 5; //~ ERROR cannot assign
|
|
|
|
println!("{}", *q);
|
|
}
|
|
|
|
fn borrow(_x: &[int], _f: ||) {}
|
|
|
|
fn b() {
|
|
// here we alias the mutable vector into an imm slice and try to
|
|
// modify the original:
|
|
|
|
let mut p = vec!(1);
|
|
|
|
borrow(
|
|
p,
|
|
|| p[0] = 5); //~ ERROR cannot borrow `p` as mutable
|
|
}
|
|
|
|
fn c() {
|
|
// Legal because the scope of the borrow does not include the
|
|
// modification:
|
|
let mut p = vec!(1);
|
|
borrow(p, ||{});
|
|
p[0] = 5;
|
|
}
|
|
|
|
fn main() {
|
|
}
|