Alloc Structs

Structs สำหรับ memory allocation

Layout

use std::alloc::Layout;

fn main() {
    // Create layout for a type
    let layout = Layout::new::<i32>();
    println!("i32 Layout:");
    println!("  size: {} bytes", layout.size());
    println!("  align: {} bytes", layout.align());

    // Layout for array
    let array_layout = Layout::array::<i32>(10).unwrap();
    println!("\n[i32; 10] Layout:");
    println!("  size: {} bytes", array_layout.size());
    println!("  align: {} bytes", array_layout.align());

    // Custom layout
    let custom = Layout::from_size_align(100, 8).unwrap();
    println!("\nCustom Layout:");
    println!("  size: {} bytes", custom.size());
    println!("  align: {} bytes", custom.align());

    // Layout of struct
    #[repr(C)]
    struct MyStruct {
        a: u8,
        b: u32,
        c: u16,
    }

    let struct_layout = Layout::new::<MyStruct>();
    println!("\nMyStruct Layout:");
    println!("  size: {} bytes", struct_layout.size());
    println!("  align: {} bytes", struct_layout.align());

    // Extend layout
    let (extended, offset) = layout.extend(Layout::new::<f64>()).unwrap();
    println!("\nExtended Layout:");
    println!("  total size: {}", extended.size());
    println!("  offset of second: {}", offset);
}