On Saturday, 30 May 2015 at 06:50:09 UTC, Ali Çehreli wrote:
On 05/29/2015 06:07 PM, Dennis Ritchie wrote:
> Hi,
> This code prints the arrays:
> [5]
> [6]
> [7]
>
> import std.stdio, std.algorithm;
>
> static int idx;
Do you want to share that for the first element of every
two-element array or do you want to start from 0 for every
range?
I want to share...
> void walk(R)(R range) {
> while (!range.empty) {
> range.front;
> range.popFront;
> ++idx;
> }
> }
As a reminder, there is also the recent 'each', which is eager
as well.
But I want to do this is to `map` :)
> void main() {
> [5, 6, 7].map!(a => [a].writeln).walk;
> }
>
> How should I apply mixins to `range.front` to the program to
print the
> arrays:
> [0, 5]
> [1, 6]
> [2, 7]
Unless mixin required for another reason, there are other ways
of achieving the same.
I just want to present the results of the intermediate
performance (which I plan to reach through the mixin)
`range.front` as a string, to then modify it with the help of
mixin to get directly to the array.
> Ie I want to get something like this:
>
> void walk(R)(R range) {
> while (!range.empty) {
> // mixin(`[idx ~ "mixin("range.front")"[1 .. $]);`);
> range.popFront;
> ++idx;
> }
> }
>
> Can I do this?
>
> -----
> Thank you for the function `walk` Mark Isaacson of
presentation DConf 2015:
> http://dconf.org/2015/talks/isaacson.pdf
The following program produces the desired output twice. The
first one starts from 0 for the index, the second one shares
the index as in your code.
import std.stdio, std.algorithm, std.range;
void main() {
zip(sequence!"n", [5, 6, 7])
.map!(a => [a.expand])
.each!writeln;
static int idx;
[5, 6, 7]
.map!(a => [idx++, a])
.each!writeln;
}
Thank you for your examples, but I want to do something else.
Ie I want to access the intermediate generation `range.front`
with two mixins or by other means. `range` is of type
`MapResult!(__lambda1, int[])([5, 6, 7], null)` — I want to get
the generation of this intermediate, i.e. something like
`range.front` --> `[5].writeln` and present `[5].writeln` as a
string, to modify the line like so `[5].writeln` -->
`[5].writeln`[1 .. $] --> `[idx ~ `[5].writeln`[1 .. $]` -->
`[idx, 5].writeln` with the help of mixins. :)
I want to access the intermediate generation `range.front`. Is it
possible? :)
