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阅读stl_list.h的笔记
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阅读stl_list.h的笔记
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struct _List_node_base
{
_List_node_base* _M_next;
_List_node_base* _M_prev;
...
};
struct _List_node_header : public _List_node_base
{
_List_node_header() _GLIBCXX_NOEXCEPT
{ _M_init(); }
_List_node_header(_List_node_header&& __x) noexcept
: _List_node_base{ __x._M_next, __x._M_prev } {}
};
template<typename _Tp>
struct _List_node : public _List_node_base
{
#if __cplusplus >= 201103L
__gnu_cxx::__aligned_membuf<_Tp> _M_storage;
_Tp* _M_valptr() { return _M_storage._M_ptr(); }
_Tp const* _M_valptr() const { return _M_storage._M_ptr(); }
#else
_Tp _M_data;
_Tp* _M_valptr() { return std::__addressof(_M_data); }
_Tp const* _M_valptr() const { return std::__addressof(_M_data); }
#endif
};
template<typename _Tp, typename _Alloc>
class _List_base
{
protected:
typedef typename __gnu_cxx::__alloc_traits<_Alloc>::template
rebind<_Tp>::other _Tp_alloc_type;
typedef __gnu_cxx::__alloc_traits<_Tp_alloc_type> _Tp_alloc_traits;
typedef typename _Tp_alloc_traits::template
rebind<_List_node<_Tp> >::other _Node_alloc_type;
typedef __gnu_cxx::__alloc_traits<_Node_alloc_type> _Node_alloc_traits;
struct _List_impl
: public _Node_alloc_type
{
_List_node_header _M_node;
}
_List_impl _M_impl;
}
template<typename _Tp, typename _Alloc = std::allocator<_Tp> >
class list : protected _List_base<_Tp, _Alloc>
{
typedef _List_base<_Tp, _Alloc> _Base;
typedef typename _Base::_Tp_alloc_type _Tp_alloc_type;
typedef typename _Base::_Tp_alloc_traits _Tp_alloc_traits;
typedef typename _Base::_Node_alloc_type _Node_alloc_type;
typedef typename _Base::_Node_alloc_traits _Node_alloc_traits;
public:
typedef _Tp value_type;
typedef typename _Tp_alloc_traits::pointer pointer;
typedef typename _Tp_alloc_traits::const_pointer const_pointer;
typedef typename _Tp_alloc_traits::reference reference;
typedef typename _Tp_alloc_traits::const_reference const_reference;
typedef _List_iterator<_Tp> iterator;
typedef _List_const_iterator<_Tp> const_iterator;
typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
typedef std::reverse_iterator<iterator> reverse_iterator;
typedef size_t size_type;
typedef ptrdiff_t difference_type;
typedef _Alloc allocator_type;
protected:
// Note that pointers-to-_Node's can be ctor-converted to
// iterator types.
typedef _List_node<_Tp> _Node;
using _Base::_M_impl;
using _Base::_M_put_node;
using _Base::_M_get_node;
using _Base::_M_get_Node_allocator;
}
template<typename _Tp>
struct _List_iterator
{
typedef _List_iterator<_Tp> _Self;
typedef _List_node<_Tp> _Node;
typedef ptrdiff_t difference_type;
typedef std::bidirectional_iterator_tag iterator_category;
typedef _Tp value_type;
typedef _Tp* pointer;
typedef _Tp& reference;
_List_node_base* _M_node;
}
template<typename _Tp>
struct _List_const_iterator
{
typedef _List_const_iterator<_Tp> _Self;
typedef const _List_node<_Tp> _Node;
typedef _List_iterator<_Tp> iterator;
typedef ptrdiff_t difference_type;
typedef std::bidirectional_iterator_tag iterator_category;
typedef _Tp value_type;
typedef const _Tp* pointer;
typedef const _Tp& reference;
const _List_node_base* _M_node;
}