More binary I/O problems

[Basile B. via Digitalmars-d-learn]

On Friday, 8 April 2016 at 20:58:06 UTC, Charles Hixson wrote:
>>[...]
> And that worked, but suddenly (after a compiler upgrade, did 
> that matter? I'd also changed the program, though in ways that 
> shouldn't have affected this.) it stopped working with the 
> message:
> let4a.d(138): Error: no [] operator overload for type Chnk
>
> [...]

you can cast too (void*)

struct Chnk
{
     char[20] wrd;
     ubyte  length;
     ulong  id;
     this (ulong id, string wrd) {}
     uint hCode () {return  0;}
     string toString () { return "";}
     string wrdStr() {return "";}
}

void main()
{
     import std.file: read, write;
     Chnk c;
     write("a.txt", (cast(void*)&c)[0..Chnk.sizeof]);
     auto buff = read("a.txt", Chnk.sizeof);
     (cast(void*)&c)[0..Chnk.sizeof] = buff[0..Chnk.sizeof];
}