On Monday, 11 March 2019 at 17:04:56 UTC, ag0aep6g wrote:
To avoid the re-evaluation, assign `ranges[0]` to a variable
before using it:
auto lines = ranges[0];
writeln(lines.front);
writeln(lines.front);
writeln(lines.front);
That should print the same line three times.
Ah yes, I forget about laziness of `map`. BTW, I have found other
solution, which is more fit to my initial intention.
```d
ReturnType!(std.stdio.File.byLineCopy!(char, immutable(char)))[]
ranges;
foreach(filename; args[1 .. $])
{
ranges ~= File(filename, "r").byLineCopy;
}
```
