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Auto merge of #23972 - gkoz:partial_eq_str_string, r=alexcrichton

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Right now comparing a `&String` (or a `&Cow`) to a `&str` requires redundant borrowing of the latter. Implementing `PartialEq<str>` tries to avoid this limitation.

```rust
struct Foo (String);

fn main () {
    let s = Foo("foo".to_string());
    match s {
        Foo(ref x) if x == &"foo" => println!("foo!"),
        // avoid this -----^
        _ => {}
    }
}
```

I was hoping that #23521 would solve this but it didn't work out.
This commit is contained in:
bors
2015-04-03 22:37:07 +00:00
parent c1b8eb5ad4 52340630a6
commit f207ecbe02
1 changed files with 12 additions and 10 deletions
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src/libcollections/string.rs
+12 -10
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@@ -796,9 +796,9 @@ fn is_prefix_of(self, haystack: &'a str) -> bool {
#[stable(feature = "rust1", since = "1.0.0")]
impl PartialEq for String {
#[inline]
fn eq(&self, other: &String) -> bool { PartialEq::eq(&**self, &**other) }
fn eq(&self, other: &String) -> bool { PartialEq::eq(&self[..], &other[..]) }
#[inline]
fn ne(&self, other: &String) -> bool { PartialEq::ne(&**self, &**other) }
fn ne(&self, other: &String) -> bool { PartialEq::ne(&self[..], &other[..]) }
}
macro_rules! impl_eq {
@@ -806,39 +806,41 @@ macro_rules! impl_eq {
#[stable(feature = "rust1", since = "1.0.0")]
impl<'a> PartialEq<$rhs> for $lhs {
#[inline]
fn eq(&self, other: &$rhs) -> bool { PartialEq::eq(&**self, &**other) }
fn eq(&self, other: &$rhs) -> bool { PartialEq::eq(&self[..], &other[..]) }
#[inline]
fn ne(&self, other: &$rhs) -> bool { PartialEq::ne(&**self, &**other) }
fn ne(&self, other: &$rhs) -> bool { PartialEq::ne(&self[..], &other[..]) }
}
#[stable(feature = "rust1", since = "1.0.0")]
impl<'a> PartialEq<$lhs> for $rhs {
#[inline]
fn eq(&self, other: &$lhs) -> bool { PartialEq::eq(&**self, &**other) }
fn eq(&self, other: &$lhs) -> bool { PartialEq::eq(&self[..], &other[..]) }
#[inline]
fn ne(&self, other: &$lhs) -> bool { PartialEq::ne(&**self, &**other) }
fn ne(&self, other: &$lhs) -> bool { PartialEq::ne(&self[..], &other[..]) }
}
}
}
impl_eq! { String, str }
impl_eq! { String, &'a str }
impl_eq! { Cow<'a, str>, str }
impl_eq! { Cow<'a, str>, String }
#[stable(feature = "rust1", since = "1.0.0")]
impl<'a, 'b> PartialEq<&'b str> for Cow<'a, str> {
#[inline]
fn eq(&self, other: &&'b str) -> bool { PartialEq::eq(&**self, &**other) }
fn eq(&self, other: &&'b str) -> bool { PartialEq::eq(&self[..], &other[..]) }
#[inline]
fn ne(&self, other: &&'b str) -> bool { PartialEq::ne(&**self, &**other) }
fn ne(&self, other: &&'b str) -> bool { PartialEq::ne(&self[..], &other[..]) }
}
#[stable(feature = "rust1", since = "1.0.0")]
impl<'a, 'b> PartialEq<Cow<'a, str>> for &'b str {
#[inline]
fn eq(&self, other: &Cow<'a, str>) -> bool { PartialEq::eq(&**self, &**other) }
fn eq(&self, other: &Cow<'a, str>) -> bool { PartialEq::eq(&self[..], &other[..]) }
#[inline]
fn ne(&self, other: &Cow<'a, str>) -> bool { PartialEq::ne(&**self, &**other) }
fn ne(&self, other: &Cow<'a, str>) -> bool { PartialEq::ne(&self[..], &other[..]) }
}
#[unstable(feature = "collections", reason = "waiting on Str stabilization")]