error when std.range.Cycle of static array is a member

[Jonathan M Davis]

On Sunday 24 July 2011 12:06:47 Lutger Blijdestijn wrote:
> I'm trying to have a Cycle range of a static array as a struct member, but
> getting a compilation error. Can anybody tell me if I'm doing something
> wrong, or is this a bug?
> 
> import std.range;
> 
> struct Foo
> {
>     ubyte[] buf;
>     Cycle!(typeof(buf)) cbuf1; // ok
> 
>     ubyte[1024] staticBuf;
>     Cycle!(typeof(staticBuf)) cbuf2; // error
> 
>     void test()
>     {
>         Cycle!(typeof(staticBuf)) cbuf3;
>         cbuf3 = cycle(staticBuf); // ok
>     }
> }
> 
> /std/range.d(228): Error: template instance std.array.front!(ubyte[1024u])
> incompatible arguments for template instantiation

static arrays are not ranges. You can't pop the front off of them, so no range-
based algorithm would work with a static range. Now, you _can_ get a dynamic 
range over a static range and _that_ is a valid range, so what you need to do 
is make the Cycle a Cycle!(ubyte[]) rather than Cycle!(ubyte[1024]), and you 
when you pass the static array to cycle, you need to slice it: 
cycle(staticBuf[]).

- Jonathan M Davis