Method isBoundary

Bcore/src/main/cpp/Dobby/tests/catch.hpp:5105–5111

    }

    auto isBoundary(size_t at) const -> bool {
      assert(at > 0);
      assert(at <= line().size());

      return at == line().size() || (isWhitespace(line()[at]) && !isWhitespace(line()[at - 1])) ||
             isBreakableBefore(line()[at]) || isBreakableAfter(line()[at - 1]);
    }

    void calcLength() {
      assert(m_stringIndex < m_column.m_strings.size());