write struct as raw data to file

[Vitaliy Fadeev]

On Monday, 27 September 2021 at 13:45:19 UTC, Paul wrote:
> Vitaliy,
>
> Thanks for your assistance.  I was looking at your 
> serialization package.  Is your example correct?
>
> struct MyStruct {
>         ubyte mybyte1;
>         @NoCereal uint nocereal1; //won't be serialised
>         @Bits!4 ubyte nibble;
>         @Bits!1 ubyte bit;
>         @Bits!3 ubyte bits3;
>         ubyte mybyte2; }
>
> assert(MyStruct(3, 123, 14, 1, 42).cerealise == [ 3, 0xea 
> /*1110 1 010*/, 42]);
>
>        mybyte1   =   3 ?
>        nocereal1 = 123 ?
>        nibble    =  14 ?
>        bit       =   1 ?
>    ??? bits3     = ___ ???
>        mybyte2   =  42 ?

Author of package is https://github.com/atilaneves
Issues here: https://github.com/atilaneves/cerealed/issues

Yes, "Bits" not worked. No value for bits3.
Next is correct:

```
import std;
import cerealed;

     struct MyStruct
     {
         ubyte mybyte1;
         @NoCereal uint nocereal1; //won't be serialised
         @Bits!4 ubyte nibble;
         @Bits!1 ubyte bit;
         @Bits!3 ubyte bits3;
         ubyte mybyte2;
     }

     void main()
     {
         assert(  MyStruct(3, 123, 14, 1, 2, 42).cerealise == [ 3, 
0xea /*1110 1 010*/, 42]);
         writeln( MyStruct(3, 123, 14, 1, 2, 42).cerealise );
     }
     ```

`[3, 234, 42]`

And check simple struct without attributes Bits, NoCereal:

```
import std;
import cerealed;

     struct MyStruct
     {
         ubyte mybyte1;
         ubyte mybyte2;
     }

     void main()
     {
         writeln( MyStruct(3, 42).cerealise );
     }
     ```

`[3, 42]`