golang struct 和 byte互转

相比于encoding, 使用unsafe性能更高

type MyStruct struct {

    A int

    B int

}

var sizeOfMyStruct = int(unsafe.Sizeof(MyStruct{}))

func MyStructToBytes(s *MyStruct) []byte {

    var x reflect.SliceHeader

    x.Len = sizeOfMyStruct

    x.Cap = sizeOfMyStruct

    x.Data = uintptr(unsafe.Pointer(s))

    return *(*[]byte)(unsafe.Pointer(&x))

}

func BytesToMyStruct(b []byte) *MyStruct {

    return (*MyStruct)(unsafe.Pointer(

        (*reflect.SliceHeader)(unsafe.Pointer(&b)).Data,

    ))

}