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Merge pull request #1841 from dtolnay/lenhint

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Remove len hint specialization
This commit is contained in:
David Tolnay 2020-06-20 19:08:34 -07:00 committed by GitHub
commit 8ff11dc234
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2 changed files with 3 additions and 32 deletions
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2
serde/src/lib.rs
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@ -89,7 +89,7 @@
// discussion of these features please refer to this issue:
//
// https://github.com/serde-rs/serde/issues/812
#![cfg_attr(feature = "unstable", feature(specialization, never_type))]
#![cfg_attr(feature = "unstable", feature(never_type))]
#![allow(unknown_lints, bare_trait_objects, deprecated)]
#![cfg_attr(feature = "cargo-clippy", allow(renamed_and_removed_lints))]
#![cfg_attr(feature = "cargo-clippy", deny(clippy, clippy_pedantic))]

33
serde/src/ser/mod.rs
View File

@ -1278,7 +1278,7 @@ pub trait Serializer: Sized {
<I as IntoIterator>::Item: Serialize,
{
let iter = iter.into_iter();
let mut serializer = try!(self.serialize_seq(iter.len_hint()));
let mut serializer = try!(self.serialize_seq(iterator_len_hint(&iter)));
for item in iter {
try!(serializer.serialize_element(&item));
}
@ -1318,7 +1318,7 @@ pub trait Serializer: Sized {
I: IntoIterator<Item = (K, V)>,
{
let iter = iter.into_iter();
let mut serializer = try!(self.serialize_map(iter.len_hint()));
let mut serializer = try!(self.serialize_map(iterator_len_hint(&iter)));
for (key, value) in iter {
try!(serializer.serialize_entry(&key, &value));
}
@ -1953,35 +1953,6 @@ pub trait SerializeStructVariant {
fn end(self) -> Result<Self::Ok, Self::Error>;
}
trait LenHint: Iterator {
fn len_hint(&self) -> Option<usize>;
}
impl<I> LenHint for I
where
I: Iterator,
{
#[cfg(not(feature = "unstable"))]
fn len_hint(&self) -> Option<usize> {
iterator_len_hint(self)
}
#[cfg(feature = "unstable")]
default fn len_hint(&self) -> Option<usize> {
iterator_len_hint(self)
}
}
#[cfg(feature = "unstable")]
impl<I> LenHint for I
where
I: ExactSizeIterator,
{
fn len_hint(&self) -> Option<usize> {
Some(self.len())
}
}
fn iterator_len_hint<I>(iter: &I) -> Option<usize>
where
I: Iterator,