On 5/14/15 11:22 PM, rcorre wrote:
On Thursday, 14 May 2015 at 18:44:58 UTC, Steven Schveighoffer wrote:
It depends on the guts of MyContainer.Range.
I'm assuming MyContainer.Range has SOME sort of references (i.e.
pointers) to the data in the container, so why not just have:
bool empty() { return someRef == null || yourCurrentTest; }
In this case, I want to return an empty range when the container
instance itself is null. I could have a static method
MyContainer.emptySlice, but I feel like I've seen this general situation
crop up a lot with small variations.
I'd have to see the code, but it seems like your situation is different
from what I think, or you are not understanding what I'm saying :)
As an example:
struct MyContainer
{
private int[] data;
struct Range
{
private int *curData;
private int *endOfData;
int front() { return *curData; }
bool empty() { return curData == endOfData; }
void popFront() { ++curData; }
}
Range opSlice() {return Range(data.ptr, data.ptr + data.length);}
}
Range.init would be a valid empty range in this case. But I have no idea
what your situation is. That's why I said it depends on the guts of the
Range.
-Steve
