[Issue 12444] std.array uninitializedArray & minimallyInitializedArray missing APPENDABLE attribute / capacity info

[d-bugmail at puremagic.com]

https://d.puremagic.com/issues/show_bug.cgi?id=12444


monarchdodra at gmail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
                 CC|                            |monarchdodra at gmail.com
         Resolution|INVALID                     |


--- Comment #2 from monarchdodra at gmail.com 2014-03-24 01:58:57 PDT ---
Just to be clear, this issue is NOT invalid. It's just that your proposed
solution doesn't work.

An implementation that could work is:

T[] uninitializedArray(T)(size_t n)
{
    T[] buff; //Declare buff.

    //Use the GC to do an Appendable allocation
    buff.reserve(n);

    //Slice out of bounds....
    buff = buff.ptr[0 .. n];

    //And tell the GC what the actual new bounds are.
    buff = assumeSafeAppend(buff);

    return buff;
}

This could not work up until now, because `assumeSafeAppend` was not nothrow.
It's not nothrow anymore, but it's not yet pure either, so it still isn't
useable.

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