Unordered Element Pairs of a Range

[Nordlöw]

Is there a range in Phobos for accessing all unordered 
combinations of a range as:

foreach (const i, const a; r)
{
    for (auto j = i + 1; j < r.length; ++j)
    {
        const b = r[j];
        // Use a and b
    }
}
excluding self-pairs, that is i != j