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use std::io::{self, Write};
pub struct ByteCounter<W> {
inner: W,
count: usize,
}
impl<W> ByteCounter<W>
where
W: Write,
{
pub fn new(inner: W) -> Self {
ByteCounter { inner, count: 0 }
}
pub fn into_inner(self) -> W {
self.inner
}
pub fn bytes_written(&self) -> usize {
self.count
}
}
impl<W> Write for ByteCounter<W>
where
W: Write,
{
fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
let res = self.inner.write(buf);
if let Ok(size) = res {
self.count += size
}
res
}
fn flush(&mut self) -> io::Result<()> {
self.inner.flush()
}
}
pub(crate) struct NextID {
obj_id: u64,
}
impl NextID {
pub(crate) fn new(start: u64) -> Self {
Self { obj_id: start }
}
pub(crate) fn next(&mut self) -> u64 {
let next = self.obj_id;
self.obj_id += 1;
next
}
}