57     m_pImpl(new implementation())  in attribute_set()
63     m_pImpl(new implementation(*that.m_pImpl))  in attribute_set()
70     delete m_pImpl;  in ~attribute_set()
76     return m_pImpl->begin();  in begin()
80     return m_pImpl->end();  in end()
84     return const_iterator(m_pImpl->begin());  in begin()
88     return const_iterator(m_pImpl->end());  in end()
94     return m_pImpl->size();  in size()
101     return m_pImpl->insert(key, data);  in insert()
107     iterator it = m_pImpl->find(key);  in erase()
110         m_pImpl->erase(it);  in erase()
120     m_pImpl->erase(it);  in erase()
128         m_pImpl->erase(begin++);  in erase()
135     m_pImpl->clear();  in clear()
141     return m_pImpl->find(key);  in find()