On 09/03/2010 12:32 PM, Bert van Leeuwen wrote:
Pelle Wrote:
On 09/03/2010 11:42 AM, Bert van Leeuwen wrote:
2) Related to above, I want to do something like map, but not return a new
array, I want to modify elements in-place in the array. How do I do that?
(without explicitly iterating with foreach etc.)
I don't know if this is intended to be supported, but at least for now
this works:
int[] xs = [1,2,3,4,5,6,7];
copy(map!`a*a`(xs), xs);
writeln(xs);
[1, 4, 9, 16, 25, 36, 49]
Interesting. For large arrays, that seems to take almost double the time of
creating a new one with array() (as in Nick's reply). So copy() obviously
doesn't do it in place (not surprising given its name), and presumably makes a
temporary array first from which to copy to a.
Try it again with -inline. For me it's within 10% with inline, and gains
even more if you add -O and -release.
It also doesn't allocate, which is just a bonus. :-)
