• 0xEAB (10/20) May 21 2018 What's the correct way to copy a `File` into another one in D?
• rikki cattermole (4/30) May 21 2018 I would probably start by reading it byChunk and writing it out as a

0xEAB <desisma heidel.beer> writes:

What's the correct way to copy a `File` into another one in D?

If `LockingTextReader` wasn't undocumented, I'd have gone for 
that approach:

 import std.algorithm.mutation : copy;
 import std.stdio : File, LockingTextReader;
 
 void main()
 {
     auto a = File("a.txt", "r");
     auto b = File("b.txt", "w");
 
     a.LockingTextReader.copy(b.lockingTextWriter);
 }


Side-note:
Although the example code suggest otherwise, I'm not talking 
about copying actual files on disk. In such a case I'd just use 
`std.file.copy` ;)
So, just imagine `a` were `stdout` of process pipe.


Kind regards,
Elias

rikki cattermole <rikki cattermole.co.nz> writes:

On 21/05/2018 11:50 PM, 0xEAB wrote:
 What's the correct way to copy a `File` into another one in D?
 
 If `LockingTextReader` wasn't undocumented, I'd have gone for that 
 approach:
 
 import std.algorithm.mutation : copy;
 import std.stdio : File, LockingTextReader;

 void main()
 {
     auto a = File("a.txt", "r");
     auto b = File("b.txt", "w");

     a.LockingTextReader.copy(b.lockingTextWriter);
 }

 
 
 Side-note:
 Although the example code suggest otherwise, I'm not talking about 
 copying actual files on disk. In such a case I'd just use 
 `std.file.copy` ;)
 So, just imagine `a` were `stdout` of process pipe.
 
 
 Kind regards,
 Elias

I would probably start by reading it byChunk and writing it out as a 
rawWrite or something along those lines. That way its using a nice 
buffer (to limit memory usage).