On 5/23/15 4:27 AM, Jonathan M Davis via Digitalmars-d-learn wrote:
On Saturday, May 23, 2015 07:03:33 Vladimir Panteleev via Digitalmars-d-learn
wrote:
int[] arr = [1, 2, 3];
auto r = iota(4, 10);
// ???
assert(equal(arr, iota(1, 10)));
Hopefully in one GC allocation (assuming we know the range's
length).
I tried std.range.primitives.put but its behavior seems a little
mysterious:
This compiles but asserts at runtime:
int[] arr = [1, 2, 3];
arr.put(iota(4, 10));
And this is even weirder, can you guess what it will print?
int[] arr = [1, 2, 3];
arr.put(4);
writeln(arr);
For better or worse, put does not append to arrays. It fills them. If you
want to append using put, then using std.array.Appender.
Yes, think of an array as a buffer. When you put into it, you are
overwriting the contents.
In addition to using Appender (which BTW will add an allocation), you
can extend the array and then fill the extended slice:
auto oldlen = arr.length;
arr.length += someRange.length;
put(arr[oldlen..$], someRange);
I wish there was a shorter way to do this...
-Steve
