rust/tests/ui/swap.rs

// Copyright 2014-2018 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution.
//
// 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.

#![warn(clippy::all)]
#![allow(clippy::blacklisted_name, unused_assignments)]

struct Foo(u32);

fn array() {
    let mut foo = [1, 2];
    let temp = foo[0];
    foo[0] = foo[1];
    foo[1] = temp;

    foo.swap(0, 1);
}

fn slice() {
    let foo = &mut [1, 2];
    let temp = foo[0];
    foo[0] = foo[1];
    foo[1] = temp;

    foo.swap(0, 1);
}

fn vec() {
    let mut foo = vec![1, 2];
    let temp = foo[0];
    foo[0] = foo[1];
    foo[1] = temp;

    foo.swap(0, 1);
}

fn main() {
    array();
    slice();
    vec();

    let mut a = 42;
    let mut b = 1337;

    a = b;
    b = a;

;    let t = a;
    a = b;
    b = t;

    let mut c = Foo(42);

    c.0 = a;
    a = c.0;

;    let t = c.0;
    c.0 = a;
    a = t;
}