[your code here]

[Paul Backus]

On Tuesday, 29 January 2019 at 21:13:16 UTC, qjnr wrote:
> /* This is a very basic implementation of cat in the D 
> programming language.
>    For more info about the D programming language, visit 
> https://dlang.org .
>
>    Copyright (c) 2018 qjnr */
>
> [...]

It's more concise (and more efficient) to use ranges for this. 
Here's an example from the documentation of std.stdio.File [1]:

// Efficient file copy, 1MB at a time.
import std.algorithm, std.stdio;
void main()
{
     stdin.byChunk(1024 * 1024).copy(stdout.lockingTextWriter());
}

[1] https://dlang.org/phobos/std_stdio.html#.File.byChunk