Re: What's wrong with my usage of std.algorithm.map in this code example?

[FreeSlave via Digitalmars-d-learn]

On Tuesday, 24 May 2016 at 20:03:14 UTC, pineapple wrote:
I would've expected this to work, but instead I get a compile 
error. Is my syntax wrong? Is this just not a case that map can 
handle, and I should be doing something else?

    import std.algorithm : map;
    import std.conv : to;
    import std.stdio : writeln;
    import std.string : join;

    string test(Args...)(in Args items){
        immutable string[items.length] itemstrings = 
map!(to!string)(items);
        return join(itemstrings, ", ");
    }

    unittest{
        writeln(test(1, 2, 3, 4));
    }

Works with 'only', 'array' and static array slicing.

import std.algorithm : map;
import std.range : only;
import std.conv : to;
import std.stdio : writeln;
import std.string : join;
import std.array : array;

string test(Args...)(in Args items){
    immutable string[items.length] itemstrings = 
map!(to!string)(only(items)).array;
    return join(itemstrings[], ", ");
}

unittest{
    writeln(test(1, 2, 3, 4));
}