258             std::vector<Column::iterator> m_iterators;  member in clara::TextFlow::Columns::iterator
265                 m_iterators.reserve( m_columns.size() );  in iterator()
268                     m_iterators.push_back( col.end() );  in iterator()
282                 m_iterators.reserve( m_columns.size() );  in iterator()
285                     m_iterators.push_back( col.begin() );  in iterator()
289                 return m_iterators == other.m_iterators;  in operator ==()
292                 return m_iterators != other.m_iterators;  in operator !=()
299                     if( m_iterators[i] != m_columns[i].end() ) {  in operator *()
300                         std::string col = *m_iterators[i];  in operator *()
315                     if (m_iterators[i] != m_columns[i].end())  in operator ++()
316                         ++m_iterators[i];  in operator ++()