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add EncoderOutput::to_borrowed()

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may more "explicit" than using `.as_mut().into()`, but
otherwise just seems like a useful addition to show the
lifetime constraints on this

Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
This commit is contained in:
Wolfgang Bumiller 2021-02-17 09:50:10 +01:00
parent f904859816
commit b8d79e5fc7
1 changed files with 13 additions and 3 deletions
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16
src/encoder/mod.rs
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@ -221,10 +221,20 @@ pub(crate) enum EncoderOutput<'a, T> {
Borrowed(&'a mut T),
}
impl<'a, T> EncoderOutput<'a, T> {
#[inline]
fn to_borrowed<'s>(&'s mut self) -> EncoderOutput<'s, T>
where
'a: 's,
{
EncoderOutput::Borrowed(self.as_mut())
}
}
impl<'a, T> std::convert::AsMut<T> for EncoderOutput<'a, T> {
fn as_mut(&mut self) -> &mut T {
match self {
EncoderOutput::Owned(ref mut o) => o,
EncoderOutput::Owned(o) => o,
EncoderOutput::Borrowed(b) => b,
}
}
@ -273,7 +283,7 @@ impl<'a, T: SeqWrite + 'a> Drop for EncoderImpl<'a, T> {
}
impl<'a, T: SeqWrite + 'a> EncoderImpl<'a, T> {
pub(crate) async fn new(output: EncoderOutput<'a, T>, metadata: &Metadata) -> io::Result<EncoderImpl<'a, T>> {
pub async fn new(output: EncoderOutput<'a, T>, metadata: &Metadata) -> io::Result<EncoderImpl<'a, T>> {
if !metadata.is_dir() {
io_bail!("directory metadata must contain the directory mode flag");
}
@ -536,7 +546,7 @@ impl<'a, T: SeqWrite + 'a> EncoderImpl<'a, T> {
Ok(EncoderImpl {
// always forward as Borrowed(), to avoid stacking references on nested calls
output: self.output.as_mut().into(),
output: self.output.to_borrowed(),
state: EncoderState {
entry_offset,
files_offset,