Thank Steve,
I open a new thread with some corrections, better title, etc.
On Wednesday, 31 March 2021 at 22:05:12 UTC, Steven Schveighoffer
wrote:
On 3/31/21 5:32 PM, ludo wrote:
[...]
ArrayBuilder should be similar in performance to Appender. I
think part of the issue with appender could be the ref counted
design. Only 1000 elements is going to show heavily the
setup/teardown time of allocation of the implementation struct.
But that is a guess. You may want to up the repetition count to
100 or 1000.
Note your code for appending with length is not doing what you
think:
void concat_withLength()
{
int[] array;
array.length = 1000;
for (int j=0; j<1000; j++)
array ~= j;
}
This allocates 1000 elements, and then append 1000 *more*
elements.
I think you meant in the loop:
array[j] = j;
This should be the fastest one.
-Steve
