Creating an array of default-constructed class instances

[Philippe Sigaud]

On Sun, Feb 10, 2013 at 8:40 AM, Simon <none at example.org> wrote:

>>     auto things = iota(10).map!(i => new Thing(i)).array;
>>
>> Ali
>
>
> It's a shame there isn't any simple syntax for it, but that's some neat and
> flexible code.

Oh, you can easily use a template:

import std.array;
import std.algorithm;
import std.conv;
import std.range;
import std.stdio;

class Thing
{
    int i;
    this(int i)
    {
        this.i = i;
    }
    void toString(scope void delegate(const(char)[]) sink) const
    {
        sink("Thing: " ~ to!string(i));
    }
}

/// Helper template
What[] makeArray(alias What)(size_t size)
{
    return iota(size).map!(i => new What(i)).array;
}

void main()
{
    auto things = makeArray!(Thing)(10);
    writeln(things);
}