Proposed resolution:

Adopt the proposed resolution in N2423.

Section [rand.req.eng] Random number engine requirements:

This change follows naturally from the proposed change to seed_seq::randomize in 677.

In table 104 the description of X(q) contains a special treatment of the case q.size() == 0. This is undesirable for 4 reasons:

1. It replicates the functionality provided by X().
2. It leads to the possibility of a collision in the state provided by some other X(q) with q.size() > 0.
3. It is inconsistent with the description of the X(q) in paragraphs [rand.eng.lcong] p5, [rand.eng.mers] p8, and [rand.eng.sub] p10 where there is no special treatment of q.size() == 0.
4. The proposed replacement for seed_seq::randomize given above allows for the case q.size() == 0.

See N2391 and N2423 for some further discussion.