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</pre><pre class="rust ">
<span class="comment">// Copyright 2012-2013 The Rust Project Developers. See the COPYRIGHT</span>
<span class="comment">// file at the top-level directory of this distribution and at</span>
<span class="comment">// http://rust-lang.org/COPYRIGHT.</span>
<span class="comment">//</span>
<span class="comment">// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span>
<span class="comment">// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span>
<span class="comment">// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your</span>
<span class="comment">// option. This file may not be copied, modified, or distributed</span>
<span class="comment">// except according to those terms.</span>
<span class="doccomment">//! The `Clone` trait for types that cannot be 'implicitly copied'.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! In Rust, some simple types are "implicitly copyable" and when you</span>
<span class="doccomment">//! assign them or pass them as arguments, the receiver will get a copy,</span>
<span class="doccomment">//! leaving the original value in place. These types do not require</span>
<span class="doccomment">//! allocation to copy and do not have finalizers (i.e. they do not</span>
<span class="doccomment">//! contain owned boxes or implement [`Drop`]), so the compiler considers</span>
<span class="doccomment">//! them cheap and safe to copy. For other types copies must be made</span>
<span class="doccomment">//! explicitly, by convention implementing the [`Clone`] trait and calling</span>
<span class="doccomment">//! the [`clone`][clone] method.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! [`Clone`]: trait.Clone.html</span>
<span class="doccomment">//! [clone]: trait.Clone.html#tymethod.clone</span>
<span class="doccomment">//! [`Drop`]: ../../std/ops/trait.Drop.html</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Basic usage example:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//! let s = String::new(); // String type implements Clone</span>
<span class="doccomment">//! let copy = s.clone(); // so we can clone it</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! To easily implement the Clone trait, you can also use</span>
<span class="doccomment">//! `#[derive(Clone)]`. Example:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//! #[derive(Clone)] // we add the Clone trait to Morpheus struct</span>
<span class="doccomment">//! struct Morpheus {</span>
<span class="doccomment">//! blue_pill: f32,</span>
<span class="doccomment">//! red_pill: i64,</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! fn main() {</span>
<span class="doccomment">//! let f = Morpheus { blue_pill: 0.0, red_pill: 0 };</span>
<span class="doccomment">//! let copy = f.clone(); // and now we can clone it!</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! ```</span>
<span class="attribute">#![<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="doccomment">/// A common trait for the ability to explicitly duplicate an object.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Differs from [`Copy`] in that [`Copy`] is implicit and extremely inexpensive, while</span>
<span class="doccomment">/// `Clone` is always explicit and may or may not be expensive. In order to enforce</span>
<span class="doccomment">/// these characteristics, Rust does not allow you to reimplement [`Copy`], but you</span>
<span class="doccomment">/// may reimplement `Clone` and run arbitrary code.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Since `Clone` is more general than [`Copy`], you can automatically make anything</span>
<span class="doccomment">/// [`Copy`] be `Clone` as well.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ## Derivable</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This trait can be used with `#[derive]` if all fields are `Clone`. The `derive`d</span>
<span class="doccomment">/// implementation of [`clone`] calls [`clone`] on each field.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ## How can I implement `Clone`?</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Types that are [`Copy`] should have a trivial implementation of `Clone`. More formally:</span>
<span class="doccomment">/// if `T: Copy`, `x: T`, and `y: &T`, then `let x = y.clone();` is equivalent to `let x = *y;`.</span>
<span class="doccomment">/// Manual implementations should be careful to uphold this invariant; however, unsafe code</span>
<span class="doccomment">/// must not rely on it to ensure memory safety.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// An example is an array holding more than 32 elements of a type that is `Clone`; the standard</span>
<span class="doccomment">/// library only implements `Clone` up until arrays of size 32. In this case, the implementation of</span>
<span class="doccomment">/// `Clone` cannot be `derive`d, but can be implemented as:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Copy`]: ../../std/marker/trait.Copy.html</span>
<span class="doccomment">/// [`clone`]: trait.Clone.html#tymethod.clone</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// #[derive(Copy)]</span>
<span class="doccomment">/// struct Stats {</span>
<span class="doccomment">/// frequencies: [i32; 100],</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// impl Clone for Stats {</span>
<span class="doccomment">/// fn clone(&self) -> Stats { *self }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ## Additional implementors</span>
<span class="doccomment">///</span>
<span class="doccomment">/// In addition to the [implementors listed below][impls],</span>
<span class="doccomment">/// the following types also implement `Clone`:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// * Function item types (i.e. the distinct types defined for each function)</span>
<span class="doccomment">/// * Function pointer types (e.g. `fn() -> i32`)</span>
<span class="doccomment">/// * Array types, for all sizes, if the item type also implements `Clone` (e.g. `[i32; 123456]`)</span>
<span class="doccomment">/// * Tuple types, if each component also implements `Clone` (e.g. `()`, `(i32, bool)`)</span>
<span class="doccomment">/// * Closure types, if they capture no value from the environment</span>
<span class="doccomment">/// or if all such captured values implement `Clone` themselves.</span>
<span class="doccomment">/// Note that variables captured by shared reference always implement `Clone`</span>
<span class="doccomment">/// (even if the referent doesn't),</span>
<span class="doccomment">/// while variables captured by mutable reference never implement `Clone`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [impls]: #implementors</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="attribute">#[<span class="ident">lang</span> <span class="op">=</span> <span class="string">"clone"</span>]</span>
<span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">Clone</span> : <span class="ident">Sized</span> {
<span class="doccomment">/// Returns a copy of the value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let hello = "Hello"; // &str implements Clone</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!("Hello", hello.clone());</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="attribute">#[<span class="ident">must_use</span> <span class="op">=</span> <span class="string">"cloning is often expensive and is not expected to have side effects"</span>]</span>
<span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="self">Self</span>;
<span class="doccomment">/// Performs copy-assignment from `source`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `a.clone_from(&b)` is equivalent to `a = b.clone()` in functionality,</span>
<span class="doccomment">/// but can be overridden to reuse the resources of `a` to avoid unnecessary</span>
<span class="doccomment">/// allocations.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">fn</span> <span class="ident">clone_from</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">source</span>: <span class="kw-2">&</span><span class="self">Self</span>) {
<span class="kw-2">*</span><span class="self">self</span> <span class="op">=</span> <span class="ident">source</span>.<span class="ident">clone</span>()
}
}
<span class="comment">// FIXME(aburka): these structs are used solely by #[derive] to</span>
<span class="comment">// assert that every component of a type implements Clone or Copy.</span>
<span class="comment">//</span>
<span class="comment">// These structs should never appear in user code.</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">missing_debug_implementations</span>)]</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"derive_clone_copy"</span>,
<span class="ident">reason</span> <span class="op">=</span> <span class="string">"deriving hack, should not be public"</span>,
<span class="ident">issue</span> <span class="op">=</span> <span class="string">"0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">AssertParamIsClone</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Clone</span> <span class="op">+</span> <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> { <span class="ident">_field</span>: ::<span class="ident">marker</span>::<span class="ident">PhantomData</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> }
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">missing_debug_implementations</span>)]</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"derive_clone_copy"</span>,
<span class="ident">reason</span> <span class="op">=</span> <span class="string">"deriving hack, should not be public"</span>,
<span class="ident">issue</span> <span class="op">=</span> <span class="string">"0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">AssertParamIsCopy</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Copy</span> <span class="op">+</span> <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> { <span class="ident">_field</span>: ::<span class="ident">marker</span>::<span class="ident">PhantomData</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> }
<span class="doccomment">/// Implementations of `Clone` for primitive types.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Implementations that cannot be described in Rust</span>
<span class="doccomment">/// are implemented in `SelectionContext::copy_clone_conditions()` in librustc.</span>
<span class="kw">mod</span> <span class="ident">impls</span> {
<span class="kw">use</span> <span class="kw">super</span>::<span class="ident">Clone</span>;
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">impl_clone</span> {
($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>:<span class="ident">ty</span>)<span class="kw-2">*</span>) <span class="op">=></span> {
$(
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="self">Self</span> {
<span class="kw-2">*</span><span class="self">self</span>
}
}
)<span class="op">*</span>
}
}
<span class="macro">impl_clone</span><span class="macro">!</span> {
<span class="ident">usize</span> <span class="ident">u8</span> <span class="ident">u16</span> <span class="ident">u32</span> <span class="ident">u64</span> <span class="ident">u128</span>
<span class="ident">isize</span> <span class="ident">i8</span> <span class="ident">i16</span> <span class="ident">i32</span> <span class="ident">i64</span> <span class="ident">i128</span>
<span class="ident">f32</span> <span class="ident">f64</span>
<span class="ident">bool</span> <span class="ident">char</span>
}
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"never_type"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"35121"</span>)]</span>
<span class="kw">impl</span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="op">!</span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="self">Self</span> {
<span class="kw-2">*</span><span class="self">self</span>
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="self">Self</span> {
<span class="kw-2">*</span><span class="self">self</span>
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="self">Self</span> {
<span class="kw-2">*</span><span class="self">self</span>
}
}
<span class="comment">// Shared references can be cloned, but mutable references *cannot*!</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="self">Self</span> {
<span class="kw-2">*</span><span class="self">self</span>
}
}
}
</pre>
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