stl_bvector.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)

      ++finish;
    }
    else {
      size_type len = size() ? 2 * size() : __WORD_BIT;
      unsigned int* q = bit_alloc(len);
      iterator i = copy(begin(), position, iterator(q, 0));
      *i++ = x;
      finish = copy(position, end(), i);
      deallocate();
      end_of_storage = q + (len + __WORD_BIT - 1)/__WORD_BIT;
      start = iterator(q, 0);
    }
  }

#ifdef __STL_MEMBER_TEMPLATES
  template <class InputIterator>
  void initialize_range(InputIterator first, InputIterator last,
                        input_iterator_tag) {
    start = iterator();
    finish = iterator();
    end_of_storage = 0;
    for ( ; first != last; ++first) 
      push_back(*first);
  }

  template <class ForwardIterator>
  void initialize_range(ForwardIterator first, ForwardIterator last,
                        forward_iterator_tag) {
    size_type n = 0;
    distance(first, last, n);
    initialize(n);
    copy(first, last, start);
  }

  template <class InputIterator>
  void insert_range(iterator pos,
                    InputIterator first, InputIterator last,
                    input_iterator_tag) {
    for ( ; first != last; ++first) {
      pos = insert(pos, *first);
      ++pos;
    }
  }

  template <class ForwardIterator>
  void insert_range(iterator position,
                    ForwardIterator first, ForwardIterator last,
                    forward_iterator_tag) {
    if (first != last) {
      size_type n = 0;
      distance(first, last, n);
      if (capacity() - size() >= n) {
        copy_backward(position, end(), finish + difference_type(n));
        copy(first, last, position);
        finish += difference_type(n);
      }
      else {
        size_type len = size() + max(size(), n);
        unsigned int* q = bit_alloc(len);
        iterator i = copy(begin(), position, iterator(q, 0));
        i = copy(first, last, i);
        finish = copy(position, end(), i);
        deallocate();
        end_of_storage = q + (len + __WORD_BIT - 1)/__WORD_BIT;
        start = iterator(q, 0);
      }
    }
  }      

#endif /* __STL_MEMBER_TEMPLATES */

public:
  iterator begin() { return start; }
  const_iterator begin() const { return start; }
  iterator end() { return finish; }
  const_iterator end() const { return finish; }

  reverse_iterator rbegin() { return reverse_iterator(end()); }
  const_reverse_iterator rbegin() const { 
    return const_reverse_iterator(end()); 
  }
  reverse_iterator rend() { return reverse_iterator(begin()); }
  const_reverse_iterator rend() const { 
    return const_reverse_iterator(begin()); 
  }

  size_type size() const { return size_type(end() - begin()); }
  size_type max_size() const { return size_type(-1); }
  size_type capacity() const {
    return size_type(const_iterator(end_of_storage, 0) - begin());
  }
  bool empty() const { return begin() == end(); }
  reference operator[](size_type n) {
    return *(begin() + difference_type(n));
  }
  const_reference operator[](size_type n) const {
    return *(begin() + difference_type(n));
  }
  __BVECTOR() : start(iterator()), finish(iterator()), end_of_storage(0) {}
  __BVECTOR(size_type n, bool value) {
    initialize(n);
    fill(start.p, end_of_storage, value ? ~0 : 0);
  }
  __BVECTOR(int n, bool value) {
    initialize(n);
    fill(start.p, end_of_storage, value ? ~0 : 0);
  }
  __BVECTOR(long n, bool value) {
    initialize(n);
    fill(start.p, end_of_storage, value ? ~0 : 0);
  }
  explicit __BVECTOR(size_type n) {
    initialize(n);
    fill(start.p, end_of_storage, 0);
  }
  __BVECTOR(const __BVECTOR& x) {
    initialize(x.size());
    copy(x.begin(), x.end(), start);
  }

#ifdef __STL_MEMBER_TEMPLATES
  template <class InputIterator>
  __BVECTOR(InputIterator first, InputIterator last) {
    initialize_range(first, last, iterator_category(first));
  }
#else /* __STL_MEMBER_TEMPLATES */
  __BVECTOR(const_iterator first, const_iterator last) {
    size_type n = 0;
    distance(first, last, n);
    initialize(n);
    copy(first, last, start);
  }
  __BVECTOR(const bool* first, const bool* last) {
    size_type n = 0;
    distance(first, last, n);
    initialize(n);
    copy(first, last, start);
  }
#endif /* __STL_MEMBER_TEMPLATES */

  ~__BVECTOR() { deallocate(); }
  __BVECTOR& operator=(const __BVECTOR& x) {
    if (&x == this) return *this;
    if (x.size() > capacity()) {
      deallocate();
      initialize(x.size());
    }
    copy(x.begin(), x.end(), begin());
    finish = begin() + difference_type(x.size());
    return *this;
  }
  void reserve(size_type n) {
    if (capacity() < n) {
      unsigned int* q = bit_alloc(n);
      finish = copy(begin(), end(), iterator(q, 0));
      deallocate();
      start = iterator(q, 0);
      end_of_storage = q + (n + __WORD_BIT - 1)/__WORD_BIT;
    }
  }
  reference front() { return *begin(); }
  const_reference front() const { return *begin(); }
  reference back() { return *(end() - 1); }
  const_reference back() const { return *(end() - 1); }
  void push_back(bool x) {
    if (finish.p != end_of_storage)
      *finish++ = x;
    else
      insert_aux(end(), x);
  }
  void swap(__BVECTOR& x) {
    __STD::swap(start, x.start);
    __STD::swap(finish, x.finish);
    __STD::swap(end_of_storage, x.end_of_storage);
  }
  iterator insert(iterator position, bool x = bool()) {
    difference_type n = position - begin();
    if (finish.p != end_of_storage && position == end())
      *finish++ = x;
    else
      insert_aux(position, x);
    return begin() + n;
  }

#ifdef __STL_MEMBER_TEMPLATES
  template <class InputIterator> void insert(iterator position,
                                             InputIterator first,
                                             InputIterator last) {
    insert_range(position, first, last, iterator_category(first));
  }
#else /* __STL_MEMBER_TEMPLATES */
  void insert(iterator position, const_iterator first, 
              const_iterator last) {
    if (first == last) return;
    size_type n = 0;
    distance(first, last, n);
    if (capacity() - size() >= n) {
      copy_backward(position, end(), finish + n);
      copy(first, last, position);
      finish += n;
    }
    else {
      size_type len = size() + max(size(), n);
      unsigned int* q = bit_alloc(len);
      iterator i = copy(begin(), position, iterator(q, 0));
      i = copy(first, last, i);
      finish = copy(position, end(), i);
      deallocate();
      end_of_storage = q + (len + __WORD_BIT - 1)/__WORD_BIT;
      start = iterator(q, 0);
    }
  }

  void insert(iterator position, const bool* first, const bool* last) {
    if (first == last) return;
    size_type n = 0;
    distance(first, last, n);
    if (capacity() - size() >= n) {
      copy_backward(position, end(), finish + n);
      copy(first, last, position);
      finish += n;
    }
    else {
      size_type len = size() + max(size(), n);
      unsigned int* q = bit_alloc(len);
      iterator i = copy(begin(), position, iterator(q, 0));
      i = copy(first, last, i);
      finish = copy(position, end(), i);
      deallocate();
      end_of_storage = q + (len + __WORD_BIT - 1)/__WORD_BIT;
      start = iterator(q, 0);
    }
  }
#endif /* __STL_MEMBER_TEMPLATES */
  
  void insert(iterator position, size_type n, bool x) {
    if (n == 0) return;
    if (capacity() - size() >= n) {
      copy_backward(position, end(), finish + difference_type(n));
      fill(position, position + difference_type(n), x);
      finish += difference_type(n);
    }
    else {
      size_type len = size() + max(size(), n);
      unsigned int* q = bit_alloc(len);
      iterator i = copy(begin(), position, iterator(q, 0));
      fill_n(i, n, x);
      finish = copy(position, end(), i + difference_type(n));
      deallocate();
      end_of_storage = q + (len + __WORD_BIT - 1)/__WORD_BIT;
      start = iterator(q, 0);
    }
  }

  void insert(iterator pos, int n, bool x)  { insert(pos, (size_type)n, x); }
  void insert(iterator pos, long n, bool x) { insert(pos, (size_type)n, x); }

  void pop_back() { --finish; }
  iterator erase(iterator position) {
    if (position + 1 != end())
      copy(position + 1, end(), position);
    --finish;
    return position;
  }
  iterator erase(iterator first, iterator last) {
    finish = copy(last, end(), first);
    return first;
  }
  void resize(size_type new_size, bool x = bool()) {
    if (new_size < size()) 
      erase(begin() + difference_type(new_size), end());
    else
      insert(end(), new_size - size(), x);
  }
  void clear() { erase(begin(), end()); }
};

#ifdef __SGI_STL_VECBOOL_TEMPLATE

typedef vector<bool, alloc> bit_vector;

#else /* __SGI_STL_VECBOOL_TEMPLATE */

inline bool operator==(const bit_vector& x, const bit_vector& y) {
  return x.size() == y.size() && equal(x.begin(), x.end(), y.begin());
}

inline bool operator<(const bit_vector& x, const bit_vector& y) {
  return lexicographical_compare(x.begin(), x.end(), y.begin(), y.end());
}

#endif /* __SGI_STL_VECBOOL_TEMPLATE */

#undef __SGI_STL_VECBOOL_TEMPLATE
#undef __BVECTOR

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

__STL_END_NAMESPACE 

#endif /* __SGI_STL_INTERNAL_BVECTOR_H */

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