1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
|
// This file is part of ICU4X. For terms of use, please see the file
// called LICENSE at the top level of the ICU4X source tree
// (online at: https://github.com/unicode-org/icu4x/blob/main/LICENSE ).
// This example demonstrates zero-copy, zero-allocation deserialization of a u32 vector
// stored in a Bincode buffer.
#![no_main] // https://github.com/unicode-org/icu4x/issues/395
icu_benchmark_macros::instrument!();
use zerovec::ZeroVec;
#[derive(serde::Serialize, serde::Deserialize)]
struct DataStruct<'s> {
#[serde(borrow)]
pub nums: ZeroVec<'s, u16>,
}
const U16_SLICE: [u16; 16] = [
196, 989, 414, 731, 660, 217, 716, 353, 218, 730, 245, 846, 122, 294, 922, 488,
];
const POSTCARD_BYTES: [u8; 33] = [
0x20, 0xc4, 0x0, 0xdd, 0x3, 0x9e, 0x1, 0xdb, 0x2, 0x94, 0x2, 0xd9, 0x0, 0xcc, 0x2, 0x61, 0x1,
0xda, 0x0, 0xda, 0x2, 0xf5, 0x0, 0x4e, 0x3, 0x7a, 0x0, 0x26, 0x1, 0x9a, 0x3, 0xe8, 0x1,
];
#[allow(dead_code)]
fn serialize() {
let data = DataStruct {
nums: ZeroVec::from_slice_or_alloc(&U16_SLICE),
};
let postcard_bytes = postcard::to_stdvec(&data).expect("Serialization should be successful");
println!("Postcard bytes: {postcard_bytes:#x?}");
println!("ZeroVec bytes: {:#x?}", data.nums.as_bytes());
}
fn main() {
// Un-comment the following line to generate postcard data:
// serialize();
let data: DataStruct = postcard::from_bytes(&POSTCARD_BYTES).expect("Valid bytes");
let result = data.nums.iter().sum::<u16>();
assert_eq!(8141, result);
}
|
