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// Copyright (c) the JPEG XL Project Authors. All rights reserved.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// TODO(firsching): as soon as "Vec::try_with_capacity" is available from the
// standard library use this instead of the functions here.
pub trait NewWithCapacity {
type Output;
type Error;
fn new_with_capacity(capacity: usize) -> Result<Self::Output, Self::Error>;
}
impl<T> NewWithCapacity for Vec<T> {
type Output = Vec<T>;
type Error = std::collections::TryReserveError;
fn new_with_capacity(capacity: usize) -> Result<Self::Output, Self::Error> {
let mut vec = Vec::new();
vec.try_reserve(capacity)?;
Ok(vec)
}
}
impl NewWithCapacity for String {
type Output = String;
type Error = std::collections::TryReserveError;
fn new_with_capacity(capacity: usize) -> Result<Self::Output, Self::Error> {
let mut s = String::new();
s.try_reserve(capacity)?;
Ok(s)
}
}