On Wednesday, 25 May 2016 at 10:24:19 UTC, pineapple wrote:
On Tuesday, 24 May 2016 at 20:18:34 UTC, Steven Schveighoffer
wrote:
Slice assignment from range to array is not supported.
In your example, I'm curious why the efforts to specify the
type? I think it would work with just saying auto itemstrings
= ...
-Steve
I still get an error if I use auto instead.
If you really need it, this works:
import std.algorithm : map;
import std.conv : to;
import std.stdio : writeln;
import std.string : join;
string test(Args...)(in Args items)
{
writeln(items.stringof);
string[] itemstrings;
foreach (const ref i; items)
itemstrings ~= i.to!string;
// auto itemstrings = items.map!(a => a.to!string);
return join(itemstrings, ", ");
}
unittest
{
writeln(test(1, 2, "v", 4, 'c'));
}
If you use map!(), you get this error:
Error: template map_error.test!(int, int, string, int,
char).test.map!((a) => a.to!string).map cannot deduce function
from argument types !()(const(int), const(int), const(string),
const(int), const(char)), candidates are:
/home/christoph/.dvm/compilers/dmd-2.071.0/linux/bin/../../src/phobos/std/algorithm/iteration.d(450):
map_error.test!(int, int, string, int, char).test.map!((a) =>
a.to!string).map(Range)(Range r) if (isInputRange!(Unqual!Range))
The argument types don't match, i.e. they are const(int) etc.
instead of int. The arguments are passed as a tuple:
cf. writeln(items.stringof);
tuple(_param_0, _param_1, _param_2, _param_3, _param_4)
