bytes into integer, need help

[Steven Schveighoffer]

"James" wrote
> im having problem in code below, while making my own file handler. the 
> data stored in buffer, so i can recall portion of data in diff format and 
> length like int,short,etc.  but im stuck with function getb() below. any 
> suggestion? thks.
>
> struct T_FILE_RAM {
>  ubyte[] buffer;
>  int offset;
>
> void getb(void* buf, int size) {
> buf=&b[offset..offset+size]; //<-- prob here
> }
>
> void read(out uint x) { getb(&x, x.sizeof); }
> void read(out ushort x) { getb(&x, x.sizeof); }
>
> }

I think you meant this?

buf[0..size] = buffer[offset..offset+size];
And also, you need to increment offset, no?
offset += size.

I'd also recommend using a template:

void getb(T)(ref T t)
{
    auto size = t.sizeof;
    auto buf = (cast(ubyte *)&t)[0..size];
    buf[] = buffer[offset..offset+size];
    offset += size;
}

Now you don't need to implement each type, and you can call like this:
int x;
ushort y;
getb(x); // reads 4 bytes
getb(y); // reads 2 bytes

-Steve