Selected elements from splitter output

[Ali Çehreli]

On 5/4/21 1:40 PM, Chris Piker wrote:

 > I only care about columns 0, 2, 3, 4, 8, 9, 10.

That's std.range.stride.

 > char[][] wanted = string_range.get( [1, 5, 7] );  // pseudo-code element

That's std.range.indexed.

import std.range;
import std.stdio;

void main() {
   auto r = 10.iota.stride(2);
   writeln(r);

   writeln(r.indexed([1, 3]));

   // Note: The above works only because 'stride' applies
   // "design by introspection" (DbI) and is able to work as a
   // RandomAccessRanges. Not every range can do that; so, in a more
   // general case, you would have to turn your range to a
   // RandomAccessRange by calling std.array.array first:
   auto r2 = r.array;
   // The following can work with any InputRange only after doing that.
   writeln(r2.indexed([1, 3]));
}

Ali