28     int m_index;  variable
30     Stack() : m_index(0) {}  in Stack()
34         NN_ASSERT(m_index<SIZE);  in push()
35         m_stack[m_index]=item;  in push()
36         ++m_index;  in push()
40         NN_ASSERT(m_index>0);  in pop()
41         --m_index;  in pop()
45         NN_ASSERT(m_index>0);  in top()
46         return m_stack[m_index-1];  in top()
48     int size() const { return m_index; }  in size()
49     bool empty() const { return m_index==0; }  in empty()