Module defer

Defer Module

This module provides a mechanism to execute a function when the current scope is exited, similar to Go’s defer statement or C++’s RAII pattern.

The defer mechanism ensures that cleanup code is executed regardless of how a scope is exited, whether through normal control flow, early returns, or error propagation.

Usage

The module provides two ways to defer execution:

1. The defer function, which takes a closure and returns an object that executes the closure when dropped:

let mut resource = acquire_resource();
let _defer = defer(|| {
    release_resource(&mut resource);
});

// Work with resource...
// When scope ends, the defer will automatically release the resource

2. The defer! macro, which offers a more concise syntax:

let mut resource = acquire_resource();
defer! {
    release_resource(&mut resource);
}

// Work with resource...
// Resource will be released when scope ends

Features

• Executes deferred functions in reverse order of declaration (LIFO)
• Works with early returns and panics
• Helps prevent resource leaks
• Simplifies cleanup logic

Implementation Details

The implementation uses Rust’s RAII (Resource Acquisition Is Initialization) pattern through the Drop trait to ensure the deferred function is called when the returned object goes out of scope. Defer module.

This module provides a mechanism to execute a function when the current scope is exited.

Functions

defer

Defer a function to be executed when the current scope is exited. This function takes a closure and returns an object that will execute the closure when it is dropped. This is useful for cleanup tasks, such as releasing resources or performing finalization steps.