problem with byLine

[simendsjo]

On Mon, 14 May 2012 10:41:54 +0200, Christian Köstlin  
<christian.koestlin at gmail.com> wrote:

> Hi,
>
> i wanted to output an ascii-file line by line, but reversed.
> the idea was to open the file, use byLine to read it line-by-line, make  
> this range an array, and retro this array.
>
> But when i convert byLine to an array, the result is already trash.
>
> Please see this snippet.
>
> import std.stdio;
> import std.array;
>
> int main(string[] args) {
>    if (args.length != 2) {
>      throw new Exception("Usage: " ~ args[0] ~ " file1");
>    }
>
>    auto f = File(args[1], "r");
>    auto i = array(f.byLine());
>    foreach (l; i) {
>      writeln(l);
>    }
>    return 0;
> }
>
> Any idea why this happens?
>
> regards
>
> christian köstlin

I believe byLine reuses the internal buffer. Try duping the lines:
   auto i = f.byLine().map!"a.idup"().array();