risingwave_common_estimate_size/collections/
vec.rs

1// Copyright 2025 RisingWave Labs
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7//     http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15use crate::EstimateSize;
16
17#[derive(Clone)]
18pub struct EstimatedVec<T: EstimateSize> {
19    inner: Vec<T>,
20    heap_size: usize,
21}
22
23impl<T: EstimateSize> Default for EstimatedVec<T> {
24    fn default() -> Self {
25        Self {
26            inner: vec![],
27            heap_size: 0,
28        }
29    }
30}
31
32impl<T: EstimateSize> EstimateSize for EstimatedVec<T> {
33    fn estimated_heap_size(&self) -> usize {
34        self.heap_size
35    }
36}
37
38impl<T: EstimateSize> EstimatedVec<T> {
39    pub fn new() -> Self {
40        Default::default()
41    }
42
43    pub fn push(&mut self, value: T) {
44        self.heap_size = self.heap_size.saturating_add(value.estimated_heap_size());
45        self.inner.push(value);
46    }
47
48    pub fn into_inner(self) -> Vec<T> {
49        self.inner
50    }
51
52    pub fn inner(&self) -> &Vec<T> {
53        &self.inner
54    }
55}
56
57impl<T: EstimateSize> IntoIterator for EstimatedVec<T> {
58    type IntoIter = std::vec::IntoIter<Self::Item>;
59    type Item = T;
60
61    fn into_iter(self) -> Self::IntoIter {
62        self.inner.into_iter()
63    }
64}
risingwave_common_estimate_size/collections/vec.rs

risingwave_common_estimate_size/collections/
vec.rs
