bendns' repos / rust-analyzer
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Manually impl clone
Browse Source
Anton Sol 2024-02-01
parent 6df2f06 · commit 1f338f7
Diffstat
-rw-r--r--lib/smol_str/src/lib.rs60
1 files changed, 7 insertions, 53 deletions
diff --git a/lib/smol_str/src/lib.rs b/lib/smol_str/src/lib.rs
index 654ed660ef..eda9aa3203 100644
--- a/lib/smol_str/src/lib.rs
+++ b/lib/smol_str/src/lib.rs
@@ -31,66 +31,20 @@ use core::{
/// Note that a specialized interner might be a better solution for some use cases.
///
/// `WS`: A string of 32 newlines followed by 128 spaces.
-#[derive(Clone)]
pub struct SmolStr(Repr);
-mod bench {
- extern crate test;
- use test::Bencher;
- fn test_strings() -> [crate::SmolStr; 200] {
- [0; 200].map(|_| crate::SmolStr::new("0123456780"))
- }
- #[bench]
- fn bench_derive_clone(b: &mut Bencher) {
- let it = test::black_box(test_strings());
- b.iter(|| {
- (0..1000)
- .map(|_| it.iter().map(|e| e.clone()))
- .flatten()
- .filter(|o| o.is_heap_allocated())
- .count()
- })
- }
- #[bench]
- fn bench_new_clone(b: &mut Bencher) {
- let it = test::black_box(test_strings());
- b.iter(|| {
- (0..1000)
- .map(|_| it.iter().map(|e| e.new_clone()))
- .flatten()
- .filter(|o| o.is_heap_allocated())
- .count()
- })
- }
- #[bench]
- fn bench_match_clone(b: &mut Bencher) {
- let it = test::black_box(test_strings());
- b.iter(|| {
- (0..1000)
- .map(|_| it.iter().map(|e| e.match_clone()))
- .flatten()
- .filter(|o| o.is_heap_allocated())
- .count()
- })
+impl Clone for SmolStr{
+ #[inline]
+ fn clone(&self) -> Self {
+ if !self.is_heap_allocated() {
+ return unsafe { core::ptr::read(self as *const SmolStr) };
+ }
+ Self(self.0.clone())
}
}
impl SmolStr {
- #[inline(always)]
- pub fn new_clone(&self) -> Self {
- if !self.is_heap_allocated() {
- return unsafe { core::mem::transmute_copy(self) };
- }
- Self(self.0.clone())
- }
- #[inline(always)]
- pub fn match_clone(&self) -> Self {
- match &self.0 {
- Repr::Heap(h) => return Self(Repr::Heap(h.clone())),
- _ => unsafe { core::mem::transmute_copy(self) },
- }
- }
#[deprecated = "Use `new_inline` instead"]
pub const fn new_inline_from_ascii(len: usize, bytes: &[u8]) -> SmolStr {
assert!(len <= INLINE_CAP);