114 lines
2.4 KiB
Rust
114 lines
2.4 KiB
Rust
// Copyright 2014-2018 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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#![warn(clippy::clone_on_ref_ptr)]
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#![allow(unused)]
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use std::cell::RefCell;
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use std::collections::HashSet;
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use std::collections::VecDeque;
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use std::rc::{self, Rc};
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use std::sync::{self, Arc};
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trait SomeTrait {}
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struct SomeImpl;
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impl SomeTrait for SomeImpl {}
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fn main() {}
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fn clone_on_copy() {
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42.clone();
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vec![1].clone(); // ok, not a Copy type
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Some(vec![1]).clone(); // ok, not a Copy type
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(&42).clone();
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let rc = RefCell::new(0);
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rc.borrow().clone();
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}
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fn clone_on_ref_ptr() {
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let rc = Rc::new(true);
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let arc = Arc::new(true);
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let rcweak = Rc::downgrade(&rc);
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let arc_weak = Arc::downgrade(&arc);
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rc.clone();
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Rc::clone(&rc);
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arc.clone();
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Arc::clone(&arc);
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rcweak.clone();
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rc::Weak::clone(&rcweak);
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arc_weak.clone();
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sync::Weak::clone(&arc_weak);
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let x = Arc::new(SomeImpl);
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let _: Arc<SomeTrait> = x.clone();
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}
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fn clone_on_copy_generic<T: Copy>(t: T) {
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t.clone();
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Some(t).clone();
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}
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fn clone_on_double_ref() {
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let x = vec![1];
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let y = &&x;
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let z: &Vec<_> = y.clone();
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println!("{:p} {:p}", *y, z);
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}
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fn iter_clone_collect() {
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let v = [1, 2, 3, 4, 5];
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let v2: Vec<isize> = v.iter().cloned().collect();
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let v3: HashSet<isize> = v.iter().cloned().collect();
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let v4: VecDeque<isize> = v.iter().cloned().collect();
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}
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mod many_derefs {
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struct A;
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struct B;
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struct C;
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struct D;
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#[derive(Copy, Clone)]
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struct E;
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macro_rules! impl_deref {
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($src:ident, $dst:ident) => {
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impl std::ops::Deref for $src {
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type Target = $dst;
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fn deref(&self) -> &Self::Target {
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&$dst
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}
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}
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};
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}
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impl_deref!(A, B);
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impl_deref!(B, C);
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impl_deref!(C, D);
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impl std::ops::Deref for D {
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type Target = &'static E;
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fn deref(&self) -> &Self::Target {
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&&E
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}
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}
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fn go1() {
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let a = A;
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let _: E = a.clone();
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let _: E = *****a;
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}
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}
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