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Use dtoa to not allocate a String to serialize a float

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This commit is contained in:
Anthony Ramine 2017-01-29 00:14:57 +01:00
parent 1d88bbb26b
commit 5625c254e5
3 changed files with 14 additions and 2 deletions
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1
Cargo.toml
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@ -12,6 +12,7 @@ keywords = ["serde", "serialization", "urlencoded"]
test = false
[dependencies]
dtoa = "0.4.0"
itoa = "0.3.0"
serde = "0.9.2"
url = "1.0.0"

1
src/lib.rs
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@ -1,6 +1,7 @@
//! `x-www-form-urlencoded` meets Serde
extern crate itoa;
extern crate dtoa;
#[macro_use]
extern crate serde;
extern crate url;

14
src/ser/part.rs
View File

@ -1,3 +1,4 @@
use dtoa;
use itoa;
use ser::Error;
use ser::void::VoidSerializer;
@ -83,11 +84,11 @@ impl<S: Sink> ser::Serializer for PartSerializer<S> {
}
fn serialize_f32(self, v: f32) -> Result<S::Ok, Error> {
self.sink.serialize_string(v.to_string())
self.serialize_floating(v)
}
fn serialize_f64(self, v: f64) -> Result<S::Ok, Error> {
self.sink.serialize_string(v.to_string())
self.serialize_floating(v)
}
fn serialize_char(self, v: char) -> Result<S::Ok, Error> {
@ -218,4 +219,13 @@ impl<S: Sink> PartSerializer<S> {
let part = unsafe { str::from_utf8_unchecked(&buf[0..len]) };
ser::Serializer::serialize_str(self, part)
}
fn serialize_floating<F>(self, value: F) -> Result<S::Ok, Error>
where F: dtoa::Floating
{
let mut buf = [b'\0'; 24];
let len = dtoa::write(&mut buf[..], value).unwrap();
let part = unsafe { str::from_utf8_unchecked(&buf[0..len]) };
ser::Serializer::serialize_str(self, part)
}
}