capture stdout or stderr

[sarn via Digitalmars-d-learn]

On Wednesday, 1 February 2017 at 01:08:19 UTC, Emil wrote:
> is it possible to intercept the  STDOUT or STDERR and capture 
> the output into a variable ?
>
>
> some pseudocode to explain what I mean
>
> string[] output_buffer;
> stdout.capture_to(output_buffer);
>
> writeln("test 1"); # not printed
> writeln("test 2"); # not printed
>
> stdout.release(output_buffer);
>
> writeln("test 3"); # printed
> writeln(output_buffer); # prints '["test 1","test 2"]'

If you *had* to, you should be able to hack it by reopening the 
file descriptors for standard output or error (at least on *nix), 
but is there a specific reason you want to do this, or do you 
just want formatted output to a variable?