Vern  Greenholt

Vern Greenholt

1612407234

Everything You Need To Know About Rust Macros

In this tutorial, we’ll cover everything you need to know about Rust macros, including an introduction to macros in Rust and a demonstration of how to use Rust macros with examples.

We’ll cover the following:

  • What are Rust macros?
  • Types of macros in Rust
  • Declarative macros in Rust
    • Creating declarative macros
    • Advanced parsing in Rust with declarative macros
    • Parsing the name and field of a struct
    • Parsing metadata from the struct
    • Limitations of declarative macros
  • Procedural macros in Rust
    • Attribute-like macros
    • Custom derive macros
    • Function-like macros

What are Rust macros?

Rust has excellent support for macros. Macros enable you to write code that writes other code, which is known as metaprogramming.

Macros provide functionality similar to functions but without the runtime cost. There is some compile-time cost, however, since macros are expanded during compile time.

Rust macros are very different from macros in C. Rust macros are applied to the token tree whereas C macros are text substitution.

Types of macros in Rust

Rust has two types of macros:

  1. Declarative macros enable you to write something similar to a match expression that operates on the Rust code you provide as arguments. It uses the code you provide to generate code that replaces the macro invocation
  2. Procedural macros allow you to operate on the abstract syntax tree (AST) of the Rust code it is given. A proc macro is a function from a TokenStream (or two) to another TokenStream, where the output replaces the macro invocation

Let’s zoom in on both declarative and procedural macros and explore some examples of how to use macros in Rust.

#rust #programming #developer

What is GEEK

Buddha Community

Everything You Need To Know About Rust Macros

Serde Rust: Serialization Framework for Rust

Serde

*Serde is a framework for serializing and deserializing Rust data structures efficiently and generically.*

You may be looking for:

Serde in action

Click to show Cargo.toml. Run this code in the playground.

[dependencies]

# The core APIs, including the Serialize and Deserialize traits. Always
# required when using Serde. The "derive" feature is only required when
# using #[derive(Serialize, Deserialize)] to make Serde work with structs
# and enums defined in your crate.
serde = { version = "1.0", features = ["derive"] }

# Each data format lives in its own crate; the sample code below uses JSON
# but you may be using a different one.
serde_json = "1.0"

 

use serde::{Serialize, Deserialize};

#[derive(Serialize, Deserialize, Debug)]
struct Point {
    x: i32,
    y: i32,
}

fn main() {
    let point = Point { x: 1, y: 2 };

    // Convert the Point to a JSON string.
    let serialized = serde_json::to_string(&point).unwrap();

    // Prints serialized = {"x":1,"y":2}
    println!("serialized = {}", serialized);

    // Convert the JSON string back to a Point.
    let deserialized: Point = serde_json::from_str(&serialized).unwrap();

    // Prints deserialized = Point { x: 1, y: 2 }
    println!("deserialized = {:?}", deserialized);
}

Getting help

Serde is one of the most widely used Rust libraries so any place that Rustaceans congregate will be able to help you out. For chat, consider trying the #rust-questions or #rust-beginners channels of the unofficial community Discord (invite: https://discord.gg/rust-lang-community), the #rust-usage or #beginners channels of the official Rust Project Discord (invite: https://discord.gg/rust-lang), or the #general stream in Zulip. For asynchronous, consider the [rust] tag on StackOverflow, the /r/rust subreddit which has a pinned weekly easy questions post, or the Rust Discourse forum. It's acceptable to file a support issue in this repo but they tend not to get as many eyes as any of the above and may get closed without a response after some time.

Download Details:
Author: serde-rs
Source Code: https://github.com/serde-rs/serde
License: View license

#rust  #rustlang 

Vern  Greenholt

Vern Greenholt

1612407234

Everything You Need To Know About Rust Macros

In this tutorial, we’ll cover everything you need to know about Rust macros, including an introduction to macros in Rust and a demonstration of how to use Rust macros with examples.

We’ll cover the following:

  • What are Rust macros?
  • Types of macros in Rust
  • Declarative macros in Rust
    • Creating declarative macros
    • Advanced parsing in Rust with declarative macros
    • Parsing the name and field of a struct
    • Parsing metadata from the struct
    • Limitations of declarative macros
  • Procedural macros in Rust
    • Attribute-like macros
    • Custom derive macros
    • Function-like macros

What are Rust macros?

Rust has excellent support for macros. Macros enable you to write code that writes other code, which is known as metaprogramming.

Macros provide functionality similar to functions but without the runtime cost. There is some compile-time cost, however, since macros are expanded during compile time.

Rust macros are very different from macros in C. Rust macros are applied to the token tree whereas C macros are text substitution.

Types of macros in Rust

Rust has two types of macros:

  1. Declarative macros enable you to write something similar to a match expression that operates on the Rust code you provide as arguments. It uses the code you provide to generate code that replaces the macro invocation
  2. Procedural macros allow you to operate on the abstract syntax tree (AST) of the Rust code it is given. A proc macro is a function from a TokenStream (or two) to another TokenStream, where the output replaces the macro invocation

Let’s zoom in on both declarative and procedural macros and explore some examples of how to use macros in Rust.

#rust #programming #developer

Trycia  Hintz

Trycia Hintz

1626408420

Learn Rust Together: Chapter 19 #2, Macros - Part 26

Twenty sixth episode in a series where we dive into The Rust Programming language and learn about Advanced Patterns! In this session we wrap up Chapter 19 of “The Rust Programming Language” with a section on Macros! Only one more chapter to go!

https://doc.rust-lang.org/book/ch19-00-advanced-features.html

– Watch live on Tuesday nights from 9pm - 11pm Eastern at https://twitch.tv/tommcgurl

#rust #macros #rust programming

Rust Lang Course For Beginner In 2021: Guessing Game

 What we learn in this chapter:
- Rust number types and their default
- First exposure to #Rust modules and the std::io module to read input from the terminal
- Rust Variable Shadowing
- Rust Loop keyword
- Rust if/else
- First exposure to #Rust match keyword

=== Content:
00:00 - Intro & Setup
02:11 - The Plan
03:04 - Variable Secret
04:03 - Number Types
05:45 - Mutability recap
06:22 - Ask the user
07:45 - First intro to module std::io
08:29 - Rust naming conventions
09:22 - Read user input io:stdin().read_line(&mut guess)
12:46 - Break & Understand
14:20 - Parse string to number
17:10 - Variable Shadowing
18:46 - If / Else - You Win, You Loose
19:28 - Loop
20:38 - Match
23:19 - Random with rand
26:35 - Run it all
27:09 - Conclusion and next episode

#rust 

Ian  Robinson

Ian Robinson

1624434540

Everything You Need to Know about Apache Storm

The ever-increasing growth in the production and analytics of Big Data keeps presenting new challenges, and the data scientists and programmers gracefully take it in their stride – by constantly improving the applications developed by them. One such problem was that of real-time streaming. Real-time data holds extremely high value for businesses, but it has a time-window after which it loses its value – an expiry date, if you will. If the value of this real-time data is not realised within the window, no usable information can be extracted from it. This real-time data comes in quickly and continuously, therefore the term “Streaming”.

Analytics of this real-time data can help you stay updated on what’s happening right now, such as the number of people reading your blog post, or the number of people visiting your Facebook page. Although it might sound like just a “nice-to-have” feature, in practice, It is essential. Imagine you’re a part of an Ad Agency performing real-time analytics on your ad-campaigns – that the client paid heavily for. Real-time analytics can keep you posted on how is your Ad performing in the market, how the users are responding to it, and other things of that nature. Quite an essential tool if you think of it this way, right?

Looking at the value that real-time data holds, organisations started coming up with various real-time data analytics tools. In this article, we’ll be talking about one of those – Apache Storm. We’ll look at what it is, the architecture of a typical storm application, it’s core components (also known as abstractions), and its real life-use cases.

Let’s go!

Table of Contents

#big data #data #technical skills #technology #everything you need to know about apache storm #apache storm