1use std::ops::Deref;
2
3use crate::serialized::Context;
4
5/// Represents the return value of [`crate::serialized_size`] function.
6///
7/// It mainly contains the size of serialized bytes in a specific format.
8///
9/// On Unix platforms, it also contains the number of file descriptors, whose indexes are included
10/// in the serialized bytes.
11#[derive(Debug)]
12pub struct Size {
13 size: usize,
14 context: Context,
15 #[cfg(unix)]
16 num_fds: u32,
17}
18
19impl Size {
20 /// Create a new `Size` instance.
21 pub fn new(size: usize, context: Context) -> Self {
22 Self {
23 size,
24 context,
25 #[cfg(unix)]
26 num_fds: 0,
27 }
28 }
29
30 /// Set the number of file descriptors.
31 #[cfg(unix)]
32 pub fn set_num_fds(mut self, num_fds: u32) -> Self {
33 self.num_fds = num_fds;
34 self
35 }
36
37 /// The size of the serialized bytes.
38 pub fn size(&self) -> usize {
39 self.size
40 }
41
42 /// The encoding context.
43 pub fn context(&self) -> Context {
44 self.context
45 }
46
47 /// The number file descriptors that are references by the serialized bytes.
48 ///
49 /// This method is only available on Unix platforms.
50 #[cfg(unix)]
51 pub fn num_fds(&self) -> u32 {
52 self.num_fds
53 }
54}
55
56impl Deref for Size {
57 type Target = usize;
58
59 fn deref(&self) -> &Self::Target {
60 &self.size
61 }
62}
63