1ed646eaf7
Libcore's test infrastructure is complicated by the fact that many lang items are defined in the crate. The current approach (realcore/realstd imports) is hacky and hard to work with (tests inside of core::cmp haven't been run for months!). Moving tests to a separate crate does mean that they can only test the public API of libcore, but I don't feel that that is too much of an issue. The only tests that I had to get rid of were some checking the various numeric formatters, but those are also exercised through normal format! calls in other tests.
112 lines
3.2 KiB
Rust
112 lines
3.2 KiB
Rust
// Copyright 2012-2013 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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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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/*! The `Clone` trait for types that cannot be 'implicitly copied'
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In Rust, some simple types are "implicitly copyable" and when you
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assign them or pass them as arguments, the receiver will get a copy,
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leaving the original value in place. These types do not require
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allocation to copy and do not have finalizers (i.e. they do not
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contain owned boxes or implement `Drop`), so the compiler considers
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them cheap and safe to copy. For other types copies must be made
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explicitly, by convention implementing the `Clone` trait and calling
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the `clone` method.
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*/
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#![unstable]
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/// A common trait for cloning an object.
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pub trait Clone {
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/// Returns a copy of the value. The contents of owned pointers
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/// are copied to maintain uniqueness, while the contents of
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/// managed pointers are not copied.
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fn clone(&self) -> Self;
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/// Perform copy-assignment from `source`.
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///
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/// `a.clone_from(&b)` is equivalent to `a = b.clone()` in functionality,
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/// but can be overridden to reuse the resources of `a` to avoid unnecessary
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/// allocations.
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#[inline(always)]
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#[experimental = "this function is mostly unused"]
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fn clone_from(&mut self, source: &Self) {
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*self = source.clone()
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}
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}
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impl<'a, T> Clone for &'a T {
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/// Return a shallow copy of the reference.
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#[inline]
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fn clone(&self) -> &'a T { *self }
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}
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impl<'a, T> Clone for &'a [T] {
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/// Return a shallow copy of the slice.
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#[inline]
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fn clone(&self) -> &'a [T] { *self }
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}
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impl<'a> Clone for &'a str {
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/// Return a shallow copy of the slice.
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#[inline]
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fn clone(&self) -> &'a str { *self }
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}
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macro_rules! clone_impl(
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($t:ty) => {
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impl Clone for $t {
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/// Return a deep copy of the value.
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#[inline]
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fn clone(&self) -> $t { *self }
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}
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}
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)
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clone_impl!(int)
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clone_impl!(i8)
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clone_impl!(i16)
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clone_impl!(i32)
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clone_impl!(i64)
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clone_impl!(uint)
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clone_impl!(u8)
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clone_impl!(u16)
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clone_impl!(u32)
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clone_impl!(u64)
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clone_impl!(f32)
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clone_impl!(f64)
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clone_impl!(())
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clone_impl!(bool)
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clone_impl!(char)
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macro_rules! extern_fn_clone(
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($($A:ident),*) => (
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#[experimental = "this may not be sufficient for fns with region parameters"]
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impl<$($A,)* ReturnType> Clone for extern "Rust" fn($($A),*) -> ReturnType {
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/// Return a copy of a function pointer
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#[inline]
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fn clone(&self) -> extern "Rust" fn($($A),*) -> ReturnType { *self }
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}
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)
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)
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extern_fn_clone!()
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extern_fn_clone!(A)
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extern_fn_clone!(A, B)
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extern_fn_clone!(A, B, C)
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extern_fn_clone!(A, B, C, D)
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extern_fn_clone!(A, B, C, D, E)
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extern_fn_clone!(A, B, C, D, E, F)
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extern_fn_clone!(A, B, C, D, E, F, G)
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extern_fn_clone!(A, B, C, D, E, F, G, H)
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