#undef NDEBUG

#include <boost/log/attributes/attribute_set.hpp>
#include <boost/log/attributes/constant.hpp>

int main()
{
    boost::log::attribute_set set;

    for (auto ch='A'; ch <= 'z'; ++ch)
    {
        auto const key(std::string("key") + ch);
        auto const res(set.insert(key, boost::log::attributes::make_constant(5)));
        assert(res.second);                              // insertion succeeded
        assert(set.find(res.first->first) != set.end()); // and so did find
        for (auto const item : set)
        {
            // But this starts to fail once every bucket in the set has an item.
            assert(set.find(item.first) != set.end());
        }
    }
    return 0;
}