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Book Overview & Buying
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Table Of Contents
Design Patterns and Best Practices in Rust
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In this section, we'll explore the Singleton pattern and its place (or lack thereof) in Rust. While Singleton is a common pattern in many languages, Rust's module system and type system often provide better alternatives. We'll see why Singleton is rarely the best solution in Rust, and what to use instead.
The Singleton pattern is traditionally used to ensure that a class has only one instance, and it provides global access to that instance. Common use cases include configuration management, shared resources, and global state. Let's see how this might appear in our calculator project.
Suppose we want to manage calculator settings globally. We can follow a traditional Singleton approach that we might use in an object-oriented language, which could look something like this:
pub struct CalculatorSettings {
precision: u32,
angle_mode: AngleMode,
notation: NumberFormat,
}
impl CalculatorSettings {
pub fn instance() -> &...