On Thursday, 24 May 2018 at 12:34:38 UTC, Steven Schveighoffer
wrote:
On 5/24/18 8:08 AM, rikki cattermole wrote:
On 25/05/2018 12:06 AM, biocyberman wrote:
I am testing with DMD 2.078.2 locally. This tiny snippet
works on dlang's online editor: https://run.dlang.io/is/nb4IV4
But it does not work on my local dmd.
import std.algorithm.mutation;
import std.stdio;
char[] arr = "hello\U00010143\u0100\U00010143".dup;
writeln(arr.reverse);
Error: template std.stdio.writeln cannot deduce function from
argument types !()(void)
The document says reverse returns a range:
https://dlang.org/phobos/std_algorithm_mutation.html#reverse
https://docarchives.dlang.io/v2.078.0/phobos/std_algorithm_mutation.html#reverse
This doesn't quite tell the whole story.
An array used to have a .reverse property that the compiler
implemented, which returned the array after reversing it. So in
history, this actually worked without std.algorithm.
You get a nice history of what happens using "all dmd versions"
on run.dlang.io. If you remove the "mutation" part from the
import, you get:
Up to 2.071.2: Success with output: ๐
ฤ๐
olleh
2.072.2 to 2.074.1: Success with output:
-----
onlineapp.d(6): Deprecation: use std.algorithm.reverse instead
of .reverse property
๐
ฤ๐
olleh
-----
2.075.1: Failure with output:
-----
onlineapp.d(6): Error: template std.stdio.writeln cannot deduce
function from argument types !()(void), candidates are:
/path/to/dmd.linux/dmd2/linux/bin64/../../src/phobos/std/stdio.d(3553):
std.stdio.writeln(T...)(T args)
-----
2.076.1 to 2.077.1: Failure with output:
-----
onlineapp.d(6): Error: template std.stdio.writeln cannot deduce
function from argument types !()(void), candidates are:
/path/to/dmd.linux/dmd2/linux/bin64/../../src/phobos/std/stdio.d(3571):
std.stdio.writeln(T...)(T args)
-----
2.078.1: Failure with output:
-----
onlineapp.d(6): Error: template std.stdio.writeln cannot deduce
function from argument types !()(void), candidates are:
/path/to/dmd.linux/dmd2/linux/bin64/../../src/phobos/std/stdio.d(3657):
std.stdio.writeln(T...)(T args)
-----
Since 2.079.0: Success with output: ๐
ฤ๐
olleh
-Steve
@Rikki and Steve: Many thanks for the good tips. I upgraded to
dmd.2.080.0 now, but the server seems to be very slow. It's
another story anyway.
% ./install.sh dmd
!9767
Downloading and unpacking
http://downloads.dlang.org/releases/2.x/2.080.0/dmd.2.080.0.linux.tar.xz
curl: (28) Operation too slow. Less than 1024 bytes/sec
transferred the last 30 seconds
Failed to download
'http://downloads.dlang.org/releases/2.x/2.080.0/dmd.2.080.0.linux.tar.xz'
