On Tuesday, 23 June 2015 at 11:22:31 UTC, Steven Schveighoffer
wrote:
On 6/23/15 1:51 AM, jkpl wrote:
On Tuesday, 23 June 2015 at 05:16:23 UTC, Assembly wrote:
[...]
* Option 1/
if most of the time you have to insert at the beginning, then
start
reading from the end and append to the end, so that the
existing block
has not to be moved. You just have to add val at the end.
* Option 2/
better way to move the whole block (this can be done with
memmove too).
---
void push(T val)
{
buffer.length += 1;
buffer[1..$] = buffer[0..$-1];
This will fail.
http://dlang.org/arrays.html#overlapping-copying
I will note, dcollections had a deque, which allowed insertion
at the front in O(1) (amortized) time. It basically worked by
having 2 arrays front to front.
-Steve
according to the C library, memmove handle overlapps, you
mismatch with memcpy which does not.
