small_vector<..>::emplace_back does not return the new element's reference

[falko.loebner@…]

I want to emplace a new item at the back of a small_vector and use the reference to the new item:

boost::container::small_vector<int,16> myVec;
auto& newItem = myVec.emplace_back(10);
assert(newItem == 10); /* this fails */

It seems like the returned reference points to the last element of the internal array (like myVec[15]). This element is uninitialized.

[Ion Gaztañaga]

Seems to be the same problem as explained in:

​https://github.com/boostorg/container/pull/45

which was fixed for Boost 1.64. Many thanks for the report.