1 // Copyright (c) 2023 Huawei Device Co., Ltd. 2 // Licensed under the Apache License, Version 2.0 (the "License"); 3 // you may not use this file except in compliance with the License. 4 // You may obtain a copy of the License at 5 // 6 // http://www.apache.org/licenses/LICENSE-2.0 7 // 8 // Unless required by applicable law or agreed to in writing, software 9 // distributed under the License is distributed on an "AS IS" BASIS, 10 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 11 // See the License for the specific language governing permissions and 12 // limitations under the License. 13 14 //! An example for `par_iter` 15 16 use ylong_runtime::iter::prelude::*; 17 main()18fn main() { 19 let fut = async { 20 let sum = (1..30) 21 .collect::<Vec<usize>>() 22 .into_par_iter() 23 .map(fibbo) 24 .sum() 25 .await 26 .unwrap(); 27 println!("{sum}"); 28 }; 29 ylong_runtime::block_on(fut); 30 } 31 fibbo(n: usize) -> usize32fn fibbo(n: usize) -> usize { 33 match n { 34 0 => 1, 35 1 => 1, 36 n => fibbo(n - 1) + fibbo(n - 2), 37 } 38 } 39