# hioff

**Repository Path**: 1467792822/hioff

## Basic Information

- **Project Name**: hioff
- **Description**: Provides C-like macro: offset_of and container_of for RUST
- **Primary Language**: Rust
- **License**: Apache-2.0
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 1
- **Created**: 2023-01-31
- **Last Updated**: 2025-01-28

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

# `hioff`

The original name is `hun_offsetof`. Provides C-like macros: `offset_of` and `container_of`

# interfaces

```rust
offset_of!(type, member) -> usize;
container_of!(&obj, type, member) -> &type;
container_of_mut!(&obj, type, member) -> &mut type;
```

# Examples

```rust

extern crate hun_offsetof as hun;

#[repr(C)]
struct Bar {
	key:	i32,
	value:	i32,
}

#[repr(C)]
struct Foo {
	key:	i32,
	value:	[Bar; 2],
}

assert_eq!(hun::offset_of!(Bar, value), 4);
assert_eq!(hun::offset_of!(Foo, value[1].key), 12);

let foo = Foo {
	key: 1,
	value: [ Bar { key: 2, value: 2}, Bar { key: 3, value: 3 }],
};
let value = &foo.value[1].value;

let obj = unsafe { hun::container_of!(value, Foo, value[1].value) };
assert_eq!(obj as *const _, &foo as *const _);
```