struct-pad

通过填充类型启用内存布局优化。

示例

use struct_pad::{Pad, PadU0, PadU8, PadU16, PadU32};

struct Example {
    field1: u64,
    field2: u8,
    // Padding fields
    pad1: PadU8,
    #[cfg(target_pointer_width = "16")]
    pad2: PadU0,
    #[cfg(not(target_pointer_width = "16"))]
    pad2: PadU16,
    #[cfg(target_pointer_width = "64")]
    pad3: PadU32,
    #[cfg(not(target_pointer_width = "64"))]
    pad3: PadU0,
 }

impl Example {
    const fn new(field1: u64, field2: u8) -> Self {
        Self {
            field1,
            field2,
            pad1: Pad::VALUE,
            pad2: Pad::VALUE,
            pad3: Pad::VALUE,
        }
    }
}