On Monday, 11 March 2019 at 17:33:31 UTC, HaraldZealot wrote:
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 .. $])
{
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
On Monday, 11 March 2019 at 15:23:53 UTC, HaraldZealot wrote:
```d
File[] files;
foreach(filename; args[1 .. $])
{
files ~= File(filename, "r");
}
auto ranges = files.map!(a => a.byLineCopy);
writeln(ranges[0].front);
writeln(ranges[0].front);
writeln(ranges[0].front);
```
produces
```
1
2
