stl_deque.h

著名的SGI的STL lib源码.(C++范型类编成,没有合适的分类,但是放到数据结构类别中也绝对适合)

    start.set_node(start.node - 1);
    start.cur = start.last - 1;
    construct(start.cur, t_copy);
  }
#     ifdef __STL_USE_EXCEPTIONS
  catch(...) {
    start.set_node(start.node + 1);
    start.cur = start.first;
    deallocate_node(*(start.node - 1));
    throw;
  }
#     endif /* __STL_USE_EXCEPTIONS */
} 

// Called only if finish.cur == finish.first.
template <class T, class Alloc, size_t BufSize>
void deque<T, Alloc, BufSize>:: pop_back_aux() {
  deallocate_node(finish.first);
  finish.set_node(finish.node - 1);
  finish.cur = finish.last - 1;
  destroy(finish.cur);
}

// Called only if start.cur == start.last - 1.  Note that if the deque
//  has at least one element (a necessary precondition for this member
//  function), and if start.cur == start.last, then the deque must have
//  at least two nodes.
template <class T, class Alloc, size_t BufSize>
void deque<T, Alloc, BufSize>::pop_front_aux() {
  destroy(start.cur);
  deallocate_node(start.first);
  start.set_node(start.node + 1);
  start.cur = start.first;
}      

#ifdef __STL_MEMBER_TEMPLATES  

template <class T, class Alloc, size_t BufSize>
template <class InputIterator>
void deque<T, Alloc, BufSize>::insert(iterator pos,
                                      InputIterator first, InputIterator last,
                                      input_iterator_tag) {
  copy(first, last, inserter(*this, pos));
}

template <class T, class Alloc, size_t BufSize>
template <class ForwardIterator>
void deque<T, Alloc, BufSize>::insert(iterator pos,
                                      ForwardIterator first,
                                      ForwardIterator last,
                                      forward_iterator_tag) {
  size_type n = 0;
  distance(first, last, n);
  if (pos.cur == start.cur) {
    iterator new_start = reserve_elements_at_front(n);
    __STL_TRY {
      uninitialized_copy(first, last, new_start);
      start = new_start;
    }
    __STL_UNWIND(destroy_nodes_at_front(new_start));
  }
  else if (pos.cur == finish.cur) {
    iterator new_finish = reserve_elements_at_back(n);
    __STL_TRY {
      uninitialized_copy(first, last, finish);
      finish = new_finish;
    }
    __STL_UNWIND(destroy_nodes_at_back(new_finish));
  }
  else
    insert_aux(pos, first, last, n);
}

#endif /* __STL_MEMBER_TEMPLATES */

template <class T, class Alloc, size_t BufSize>
typename deque<T, Alloc, BufSize>::iterator
deque<T, Alloc, BufSize>::insert_aux(iterator pos, const value_type& x) {
  difference_type index = pos - start;
  value_type x_copy = x;
  if (index < size() / 2) {
    push_front(front());
    iterator front1 = start;
    ++front1;
    iterator front2 = front1;
    ++front2;
    pos = start + index;
    iterator pos1 = pos;
    ++pos1;
    copy(front2, pos1, front1);
  }
  else {
    push_back(back());
    iterator back1 = finish;
    --back1;
    iterator back2 = back1;
    --back2;
    pos = start + index;
    copy_backward(pos, back2, back1);
  }
  *pos = x_copy;
  return pos;
}

template <class T, class Alloc, size_t BufSize>
void deque<T, Alloc, BufSize>::insert_aux(iterator pos,
                                          size_type n, const value_type& x) {
  const difference_type elems_before = pos - start;
  size_type length = size();
  value_type x_copy = x;
  if (elems_before < length / 2) {
    iterator new_start = reserve_elements_at_front(n);
    iterator old_start = start;
    pos = start + elems_before;
    __STL_TRY {
      if (elems_before >= difference_type(n)) {
        iterator start_n = start + difference_type(n);
        uninitialized_copy(start, start_n, new_start);
        start = new_start;
        copy(start_n, pos, old_start);
        fill(pos - difference_type(n), pos, x_copy);
      }
      else {
        __uninitialized_copy_fill(start, pos, new_start, start, x_copy);
        start = new_start;
        fill(old_start, pos, x_copy);
      }
    }
    __STL_UNWIND(destroy_nodes_at_front(new_start));
  }
  else {
    iterator new_finish = reserve_elements_at_back(n);
    iterator old_finish = finish;
    const difference_type elems_after = difference_type(length) - elems_before;
    pos = finish - elems_after;
    __STL_TRY {
      if (elems_after > difference_type(n)) {
        iterator finish_n = finish - difference_type(n);
        uninitialized_copy(finish_n, finish, finish);
        finish = new_finish;
        copy_backward(pos, finish_n, old_finish);
        fill(pos, pos + difference_type(n), x_copy);
      }
      else {
        __uninitialized_fill_copy(finish, pos + difference_type(n),
                                  x_copy,
                                  pos, finish);
        finish = new_finish;
        fill(pos, old_finish, x_copy);
      }
    }
    __STL_UNWIND(destroy_nodes_at_back(new_finish));
  }
}

#ifdef __STL_MEMBER_TEMPLATES  

template <class T, class Alloc, size_t BufSize>
template <class ForwardIterator>
void deque<T, Alloc, BufSize>::insert_aux(iterator pos,
                                          ForwardIterator first,
                                          ForwardIterator last,
                                          size_type n)
{
  const difference_type elems_before = pos - start;
  size_type length = size();
  if (elems_before < length / 2) {
    iterator new_start = reserve_elements_at_front(n);
    iterator old_start = start;
    pos = start + elems_before;
    __STL_TRY {
      if (elems_before >= difference_type(n)) {
        iterator start_n = start + difference_type(n); 
        uninitialized_copy(start, start_n, new_start);
        start = new_start;
        copy(start_n, pos, old_start);
        copy(first, last, pos - difference_type(n));
      }
      else {
        ForwardIterator mid = first;
        advance(mid, difference_type(n) - elems_before);
        __uninitialized_copy_copy(start, pos, first, mid, new_start);
        start = new_start;
        copy(mid, last, old_start);
      }
    }
    __STL_UNWIND(destroy_nodes_at_front(new_start));
  }
  else {
    iterator new_finish = reserve_elements_at_back(n);
    iterator old_finish = finish;
    const difference_type elems_after = difference_type(length) - elems_before;
    pos = finish - elems_after;
    __STL_TRY {
      if (elems_after > difference_type(n)) {
        iterator finish_n = finish - difference_type(n);
        uninitialized_copy(finish_n, finish, finish);
        finish = new_finish;
        copy_backward(pos, finish_n, old_finish);
        copy(first, last, pos);
      }
      else {
        ForwardIterator mid = first;
        advance(mid, elems_after);
        __uninitialized_copy_copy(mid, last, pos, finish, finish);
        finish = new_finish;
        copy(first, mid, pos);
      }
    }
    __STL_UNWIND(destroy_nodes_at_back(new_finish));
  }
}

#else /* __STL_MEMBER_TEMPLATES */

template <class T, class Alloc, size_t BufSize>
void deque<T, Alloc, BufSize>::insert_aux(iterator pos,
                                          const value_type* first,
                                          const value_type* last,
                                          size_type n)
{
  const difference_type elems_before = pos - start;
  size_type length = size();
  if (elems_before < length / 2) {
    iterator new_start = reserve_elements_at_front(n);
    iterator old_start = start;
    pos = start + elems_before;
    __STL_TRY {
      if (elems_before >= difference_type(n)) {
        iterator start_n = start + difference_type(n);
        uninitialized_copy(start, start_n, new_start);
        start = new_start;
        copy(start_n, pos, old_start);
        copy(first, last, pos - difference_type(n));
      }
      else {
        const value_type* mid = first + (difference_type(n) - elems_before);
        __uninitialized_copy_copy(start, pos, first, mid, new_start);
        start = new_start;
        copy(mid, last, old_start);
      }
    }
    __STL_UNWIND(destroy_nodes_at_front(new_start));
  }
  else {
    iterator new_finish = reserve_elements_at_back(n);
    iterator old_finish = finish;
    const difference_type elems_after = difference_type(length) - elems_before;
    pos = finish - elems_after;
    __STL_TRY {
      if (elems_after > difference_type(n)) {
        iterator finish_n = finish - difference_type(n);
        uninitialized_copy(finish_n, finish, finish);
        finish = new_finish;
        copy_backward(pos, finish_n, old_finish);
        copy(first, last, pos);
      }
      else {
        const value_type* mid = first + elems_after;
        __uninitialized_copy_copy(mid, last, pos, finish, finish);
        finish = new_finish;
        copy(first, mid, pos);
      }
    }
    __STL_UNWIND(destroy_nodes_at_back(new_finish));
  }
}

template <class T, class Alloc, size_t BufSize>
void deque<T, Alloc, BufSize>::insert_aux(iterator pos,
                                          const_iterator first,
                                          const_iterator last,
                                          size_type n)
{
  const difference_type elems_before = pos - start;
  size_type length = size();
  if (elems_before < length / 2) {
    iterator new_start = reserve_elements_at_front(n);
    iterator old_start = start;
    pos = start + elems_before;
    __STL_TRY {
      if (elems_before >= n) {
        iterator start_n = start + n;
        uninitialized_copy(start, start_n, new_start);
        start = new_start;
        copy(start_n, pos, old_start);
        copy(first, last, pos - difference_type(n));
      }
      else {
        const_iterator mid = first + (n - elems_before);
        __uninitialized_copy_copy(start, pos, first, mid, new_start);
        start = new_start;
        copy(mid, last, old_start);
      }
    }
    __STL_UNWIND(destroy_nodes_at_front(new_start));
  }
  else {
    iterator new_finish = reserve_elements_at_back(n);
    iterator old_finish = finish;
    const difference_type elems_after = length - elems_before;
    pos = finish - elems_after;
    __STL_TRY {
      if (elems_after > n) {
        iterator finish_n = finish - difference_type(n);
        uninitialized_copy(finish_n, finish, finish);
        finish = new_finish;
        copy_backward(pos, finish_n, old_finish);
        copy(first, last, pos);
      }
      else {
        const_iterator mid = first + elems_after;
        __uninitialized_copy_copy(mid, last, pos, finish, finish);
        finish = new_finish;
        copy(first, mid, pos);
      }
    }
    __STL_UNWIND(destroy_nodes_at_back(new_finish));
  }
}

#endif /* __STL_MEMBER_TEMPLATES */

template <class T, class Alloc, size_t BufSize>
void deque<T, Alloc, BufSize>::new_elements_at_front(size_type new_elements) {
  size_type new_nodes = (new_elements + buffer_size() - 1) / buffer_size();
  reserve_map_at_front(new_nodes);
  size_type i;
  __STL_TRY {
    for (i = 1; i <= new_nodes; ++i)
      *(start.node - i) = allocate_node();
  }
#       ifdef __STL_USE_EXCEPTIONS
  catch(...) {
    for (size_type j = 1; j < i; ++j)
      deallocate_node(*(start.node - j));      
    throw;
  }
#       endif /* __STL_USE_EXCEPTIONS */
}

template <class T, class Alloc, size_t BufSize>
void deque<T, Alloc, BufSize>::new_elements_at_back(size_type new_elements) {
  size_type new_nodes = (new_elements + buffer_size() - 1) / buffer_size();
  reserve_map_at_back(new_nodes);
  size_type i;
  __STL_TRY {
    for (i = 1; i <= new_nodes; ++i)
      *(finish.node + i) = allocate_node();
  }
#       ifdef __STL_USE_EXCEPTIONS
  catch(...) {
    for (size_type j = 1; j < i; ++j)
      deallocate_node(*(finish.node + j));      
    throw;
  }
#       endif /* __STL_USE_EXCEPTIONS */
}

template <class T, class Alloc, size_t BufSize>
void deque<T, Alloc, BufSize>::destroy_nodes_at_front(iterator before_start) {
  for (map_pointer n = before_start.node; n < start.node; ++n)
    deallocate_node(*n);
}

template <class T, class Alloc, size_t BufSize>
void deque<T, Alloc, BufSize>::destroy_nodes_at_back(iterator after_finish) {
  for (map_pointer n = after_finish.node; n > finish.node; --n)
    deallocate_node(*n);
}

template <class T, class Alloc, size_t BufSize>
void deque<T, Alloc, BufSize>::reallocate_map(size_type nodes_to_add,
                                              bool add_at_front) {
  size_type old_num_nodes = finish.node - start.node + 1;
  size_type new_num_nodes = old_num_nodes + nodes_to_add;

  map_pointer new_nstart;
  if (map_size > 2 * new_num_nodes) {
    new_nstart = map + (map_size - new_num_nodes) / 2 
                     + (add_at_front ? nodes_to_add : 0);
    if (new_nstart < start.node)
      copy(start.node, finish.node + 1, new_nstart);
    else
      copy_backward(start.node, finish.node + 1, new_nstart + old_num_nodes);
  }
  else {
    size_type new_map_size = map_size + max(map_size, nodes_to_add) + 2;

    map_pointer new_map = map_allocator::allocate(new_map_size);
    new_nstart = new_map + (new_map_size - new_num_nodes) / 2
                         + (add_at_front ? nodes_to_add : 0);
    copy(start.node, finish.node + 1, new_nstart);
    map_allocator::deallocate(map, map_size);

    map = new_map;
    map_size = new_map_size;
  }

  start.set_node(new_nstart);
  finish.set_node(new_nstart + old_num_nodes - 1);
}


// Nonmember functions.

#ifndef __STL_NON_TYPE_TMPL_PARAM_BUG

template <class T, class Alloc, size_t BufSiz>
bool operator==(const deque<T, Alloc, BufSiz>& x,
                const deque<T, Alloc, BufSiz>& y) {
  return x.size() == y.size() && equal(x.begin(), x.end(), y.begin());
}

template <class T, class Alloc, size_t BufSiz>
bool operator<(const deque<T, Alloc, BufSiz>& x,
               const deque<T, Alloc, BufSiz>& y) {
  return lexicographical_compare(x.begin(), x.end(), y.begin(), y.end());
}

#endif /* __STL_NON_TYPE_TMPL_PARAM_BUG */

#if defined(__STL_FUNCTION_TMPL_PARTIAL_ORDER) && \
    !defined(__STL_NON_TYPE_TMPL_PARAM_BUG)

template <class T, class Alloc, size_t BufSiz>
inline void swap(deque<T, Alloc, BufSiz>& x, deque<T, Alloc, BufSiz>& y) {
  x.swap(y);
}

#endif

#if defined(__sgi) && !defined(__GNUC__) && (_MIPS_SIM != _MIPS_SIM_ABI32)
#pragma reset woff 1174
#endif
          
__STL_END_NAMESPACE 
  
#endif /* __SGI_STL_INTERNAL_DEQUE_H */

// Local Variables:
// mode:C++
// End: