Appender and CTFE

[Steven Schveighoffer]

On Thu, 03 Mar 2011 11:54:58 -0500, kenji hara <k.hara.pg at gmail.com> wrote:

> Even without performance issue, Appender is necessary because it
> configures output range.
>
> Currently std.array.put does not allow empty array as its argument.
> int[] arr = [];
> arr.put(1);  // invalid. this does not means appending.
>
> Therefore building an array its length is not known beforehand
> requires Appender.

Performance really is the only issue, the complexity of Appender is not  
necessary for your issue.  One could make a very simple appender struct if  
creating a proper output range was the only problem:

struct appender(T)
{
    T[] data;
    void put(T t) { data ~= t; }
}

-Steve