rust

How to parse a date with milliseconds?

由 ℡╲_俬逩灬. 提交于 2021-01-27 04:25:27
问题 I have a date in the following format: "2014-03-10 11:20:34.3454" . How can I parse this date? The chrono doc mentions parsing year, month, ..., minutes and seconds. No milliseconds. Also when I look at rust-datetime again - no milliseconds. On the other hand, I can create a DateTime like this UTC.ymd(2014, 11, 28).and_hms_milli(7, 8, 9, 10) . So Rust knows milliseconds... 回答1: extern crate time; fn main() { match time::strptime("2014-03-10 11:20:34.3454", "%Y-%m-%d %H:%M:%S.%f") { Ok(v) =>

How to parse a date with milliseconds?

由 此生再无相见时 提交于 2021-01-27 04:23:10
问题 I have a date in the following format: "2014-03-10 11:20:34.3454" . How can I parse this date? The chrono doc mentions parsing year, month, ..., minutes and seconds. No milliseconds. Also when I look at rust-datetime again - no milliseconds. On the other hand, I can create a DateTime like this UTC.ymd(2014, 11, 28).and_hms_milli(7, 8, 9, 10) . So Rust knows milliseconds... 回答1: extern crate time; fn main() { match time::strptime("2014-03-10 11:20:34.3454", "%Y-%m-%d %H:%M:%S.%f") { Ok(v) =>

JNI Object Pointers

由 别来无恙 提交于 2021-01-27 04:18:09
问题 Problem When experimenting with the JNI interface, I was wondering if I could take a JObject and transmute it into an equivalent struct to manipulate the fields. However, when I tried I was surprised to see that this did not work. Ignoring how horrible this idea might be, why didn't it work? My Approach Java Test Class I made a simple class Point to do my test. Point has two fields and a constructor that takes in an x and y as well as a few random methods that return information based on the

WebAssembly 在 AI 推理中的作用

由 荒凉一梦 提交于 2021-01-27 02:39:38
文中带有大量链接，点击阅读原文，查看文中所附资源 阅读本教程后，你将能够独立构建一个用于图像分类的 Serverless 应用，比如这个 能识别食物的网页 。你也可以在腾讯云上试试 更多 TensorFlow 函数 。 人工智能（AI）正在改变我们的生活。但是，AI 应用所需要的，远远不止算法、数据科学和大数据训练模型。据估计，在生产环境中，95% 的人工智能计算都是用于推理的。使用人工智能推理服务的最佳平台是公共云或边缘云 ，因为云能够提供丰富的计算能力、高效安全的模型管理，以及更快的 5G 互联网连接。 把 AI 模型放到云上的生产环境，比如腾讯云，我们有几种方法。 你可以启动一个虚拟机服务器，并使用 TensorFlow Server 等工具运行 AI 模型。这种 DIY 方法需要对人工智能和操作系统都有深入的操作知识，而且通常相当昂贵，因为你需要为闲置资源付费。 你也可以使用公有云的 AI SaaS 服务上传自己的模型，然后使用 web UI 或 API 上传数据进行推理。这很容易，但不太灵活。会受到 SaaS 所支持的模型、配置和数据预处理/后处理的种类的限制。 但是对于大多数开发者来说，在自己的应用程序中使用 AI 推理需要灵活性与易用性兼备。也就是说，大部分的应用需求介于 DIY 和 AI SaaS 之间。这是为什么在生产环境中部署 AI 模型是一件很有挑战的事。

Mutable structs in a vector

由 ▼魔方 西西 提交于 2021-01-27 02:16:44
问题 I'm trying to create a vector to keep track of enemies in a game that will hold a bunch of mutable structs. I have a world struct that has the enemies as a member of it as follows: pub struct World { pub player : Creature, pub enemies : Vec<Creature>, } I create the enemies vector as follows: let mut enemies = vec![]; let mut enemy = Creature::new(5, 5, map_start_x+5, map_start_y+5, "$", 10, 1, "") enemies.push(enemy); later on in the code when I pull out an individual enemy from enemies for

How can I implement Ord when the comparison depends on data not part of the compared items?

由 走远了吗. 提交于 2021-01-26 20:38:31
问题 I have a small struct containing only an i32 : struct MyStruct { value: i32, } I want to implement Ord in order to store MyStruct in a BTreeMap or any other data structure that requires you to have Ord on its elements. In my case, comparing two instances of MyStruct does not depend on the value s in them, but asking another data structure (a dictionary), and that data structure is unique for each instance of the BTreeMap I will create. So ideally it would look like this: impl Ord for MyStruct

How can I implement Ord when the comparison depends on data not part of the compared items?

由 拈花ヽ惹草 提交于 2021-01-26 20:38:19
问题 I have a small struct containing only an i32 : struct MyStruct { value: i32, } I want to implement Ord in order to store MyStruct in a BTreeMap or any other data structure that requires you to have Ord on its elements. In my case, comparing two instances of MyStruct does not depend on the value s in them, but asking another data structure (a dictionary), and that data structure is unique for each instance of the BTreeMap I will create. So ideally it would look like this: impl Ord for MyStruct

How can I implement Ord when the comparison depends on data not part of the compared items?

由 泪湿孤枕 提交于 2021-01-26 20:38:07
问题 I have a small struct containing only an i32 : struct MyStruct { value: i32, } I want to implement Ord in order to store MyStruct in a BTreeMap or any other data structure that requires you to have Ord on its elements. In my case, comparing two instances of MyStruct does not depend on the value s in them, but asking another data structure (a dictionary), and that data structure is unique for each instance of the BTreeMap I will create. So ideally it would look like this: impl Ord for MyStruct

Is there a way to fold with index in Rust?

由 一曲冷凌霜 提交于 2021-01-26 05:58:52
问题 In Ruby, if I had an array a = [1, 2, 3, 4, 5] and I wanted to get the sum of each element times its index I could do a.each.with_index.inject(0) {|s,(i,j)| s + i*j} Is there an idiomatic way to do the same thing in Rust? So far, I have a.into_iter().fold(0, |x, i| x + i) But that doesn't account for the index, and I can't really figure out a way to get it to account for the index. Is this possible and if so, how? 回答1: You can chain it with enumerate: fn main() { let a = [1, 2, 3, 4, 5]; let

How to implement bitwise operations on a bitflags enum?

由 时光总嘲笑我的痴心妄想 提交于 2021-01-26 04:00:55
问题 I have an enum that looks like this: #[repr(u8)] pub enum PublicFlags { PublicFlagVersion = 0x01, PublicFlagReset = 0x02, NoncePresent = 0x04, IdPresent = 0x08, PktNumLen4 = 0x30, PktNumLen2 = 0x20, PktNumLen1 = 0x10, Multipath = 0x40, } I want to do a bitwise operation on several of the enum values. However, the Rust compiler complains: an implementation of `std::ops::BitAnd` might be missing for `PublicFlags`. 回答1: An enum in Rust is not intended to be used as bit flags. PublicFlags can
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