Method insert

src/fl/stl/flat_set.h:204–216

Insertion

    // Insertion
    fl::pair<iterator, bool> insert(const value_type& value) {
        auto it = lower_bound(value);
        if (it != end() && !mLess(value, *it) && !mLess(*it, value)) {
            return fl::pair<iterator, bool>(it, false);  // Already exists
        }
        bool success = mData.insert(it, value);
        if (success) {
            // After insert, find the newly inserted element
            it = find(value);
            return fl::pair<iterator, bool>(it, true);
        }
        return fl::pair<iterator, bool>(end(), false);
    }

    fl::pair<iterator, bool> insert(value_type&& value) {
        auto key = value;