Crate assert_size_derive 

Compile-time type size assertions.

This crate provides the assert_size attribute macro for verifying that types have the expected size in bytes at compile time.

Quick Start

use assert_size_derive::assert_size;

#[assert_size(2)]
struct MyData {
    foo: u8,
    bar: u8,
}

If the size doesn’t match, compilation will fail with a clear error message.

Use Cases

• Catching unintended size changes from code refactoring
• Ensuring types meet specific memory layout requirements for FFI or serialization
• Documenting expected type sizes for performance-critical code
• Detecting platform-specific size variations

Attribute Macros

assert_size

A compile-time assertion that verifies a type has the expected size in bytes.