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use with_capacity in read read_to_string

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This commit is contained in:
yukang 2023-01-11 00:19:27 +08:00
parent eae615dfdd
commit f7bc68bb4e
1 changed files with 2 additions and 4 deletions
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6
library/std/src/fs.rs
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@ -249,9 +249,8 @@ pub struct DirBuilder {
pub fn read<P: AsRef<Path>>(path: P) -> io::Result<Vec<u8>> {
fn inner(path: &Path) -> io::Result<Vec<u8>> {
let mut file = File::open(path)?;
let mut bytes = Vec::new();
let size = file.metadata().map(|m| m.len()).unwrap_or(0);
bytes.reserve(size as usize);
let mut bytes = Vec::with_capacity(size as usize);
io::default_read_to_end(&mut file, &mut bytes)?;
Ok(bytes)
}
@ -290,9 +289,8 @@ pub fn read<P: AsRef<Path>>(path: P) -> io::Result<Vec<u8>> {
pub fn read_to_string<P: AsRef<Path>>(path: P) -> io::Result<String> {
fn inner(path: &Path) -> io::Result<String> {
let mut file = File::open(path)?;
let mut string = String::new();
let size = file.metadata().map(|m| m.len()).unwrap_or(0);
string.reserve(size as usize);
let mut string = String::with_capacity(size as usize);
io::default_read_to_string(&mut file, &mut string)?;
Ok(string)
}