Posts (page 189)
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6 min readTo create a vector of RwLock in Rust, you can follow these steps:Import the necessary module for RwLock from the standard library: use std::sync::RwLock; Create an empty vector that will hold your RwLock instances: let mut vector: Vec<RwLock<T>> = Vec::new(); Replace T with the type you want the elements in the vector to have.Push new RwLock instances into the vector: vector.push(RwLock::new(value)); Replace value with the actual value you want to insert into the vector.
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4 min readIn Kotlin, exceptions are handled using try-catch blocks. The try block contains the code that may throw an exception, and the catch block handles the exception if it occurs. Here is an example of how to handle exceptions in Kotlin: try { // code that may throw an exception } catch (e: Exception) { // handling the exception } In the try block, you place the code that you think might throw an exception. If an exception occurs, the code execution jumps to the corresponding catch block.
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7 min readTo add threading to a for loop in Rust, you can leverage the facilities provided by Rust's standard library and the std::thread module. Here's a general explanation of the process:Import the necessary modules: use std::thread; use std::sync::{Arc, Mutex}; Define the function that will be executed concurrently for each element of the loop. This function will be called from different threads: fn handle_item(item: &str) { // Perform any processing on the item println.
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8 min readHigher-order functions in Kotlin are a powerful feature that allows you to treat functions as first-class citizens. In other words, you can pass functions as arguments to other functions, return them from functions, or even assign them to variables.To work with higher-order functions in Kotlin, you can follow these guidelines:Define a higher-order function: Start by defining a function that takes one or more functions as arguments or returns a function.
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4 min readTo get a Lua table from context in Rust, you can use the mlua crate which provides bindings for interacting with Lua from Rust. Here is a step-by-step guide on how to do it:First, add the mlua dependency to your Cargo.toml file: [dependencies] mlua = "0.5" In your Rust code, import the necessary modules: use mlua::{Lua, Value}; Create a Lua context and load your Lua script: let lua = Lua::new(); let script = r#" -- Lua script code goes here "#; lua.load(script).exec().
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7 min readCoroutines are a powerful tool in Kotlin that allow for asynchronous programming. They provide a way to write asynchronous code in a sequential and readable manner.To use coroutines for asynchronous programming in Kotlin, you need to follow these steps:Set up the Coroutine Scope: Coroutines are executed within a coroutine scope, which manages the lifecycle of all coroutines. You can create a coroutine scope using the CoroutineScope interface.
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7 min readTo statically link Node.js in Rust, you can follow the following steps:Add the nodejs-sys crate as a dependency in your Cargo.toml file: [dependencies] nodejs-sys = "0.
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7 min readTo implement the Singleton pattern in Kotlin, you can follow these steps:Create a class and make its constructor private to prevent direct instantiation. Declare an object within the class, representing the Singleton instance. This object will be lazily initialized, meaning it will be created when it is first accessed. Optionally, you can define properties and methods within the Singleton object, which will be accessible through the Singleton instance.
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7 min readTo call a C function in Rust, you need to use the Foreign Function Interface (FFI) provided by Rust. Here are the steps involved:Define the C function signature: First, you need to declare the C function signature in your Rust code. This includes the function name, return type, and parameter types. For example, if the C function is defined as int add_numbers(int a, int b), your Rust code should include a declaration like extern "C" fn add_numbers(a: i32, b: i32) -> i32;.
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6 min readIn Kotlin, the let and run functions are useful tools for simplifying and enhancing your code. While both functions have some similarities, they differ in the way they are used and their intended purposes.The let function is used to execute a block of code on a non-null object and allows you to perform operations on that object within the block. It is particularly handy when you want to avoid null checks and ensure safe operations by executing code only if the object is not null.
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3 min readTo convert a char** to a Vec<String> in Rust, you can use the following steps:Collect the C-style strings into CStr slices: use std::ffi::CStr; let c_strs: Vec<&CStr> = (0..size).map(|i| { unsafe { CStr::from_ptr(char_double_ptr[i]) } }).collect(); Convert CStr slices to Rust String objects: let rust_strings: Vec<String> = c_strs.iter().map(|&c_str| { c_str.to_string_lossy().to_string() }).collect(); Here, size is the size of the char** array.
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8 min readIn Kotlin, data classes provide a convenient way to define classes that are primarily used to hold data. They are automatically equipped with useful functionalities like getter and setter methods, toString(), equals(), hashCode(), and copy() methods. Working with data classes in Kotlin involves the following steps:Declaring a Data Class: To declare a data class, use the "data" keyword before the class declaration.