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0x804d8000 avatar 0x804d8000 commented on May 5, 2024

通常认为从软件工程角度,角度组合比继承更有助于良好的扩展性及长期的代码维护

See also https://en.m.wikipedia.org/wiki/Composition_over_inheritance

from flare.

4kangjc avatar 4kangjc commented on May 5, 2024

通常认为从软件工程角度,角度组合比继承更有助于良好的扩展性及长期的代码维护

See also https://en.m.wikipedia.org/wiki/Composition_over_inheritance

嗯好

from flare.

4kangjc avatar 4kangjc commented on May 5, 2024

只是刚好想到红黑树里的设计是这样的

struct _Rb_tree_node_base
  {
    typedef _Rb_tree_node_base* _Base_ptr;
    typedef const _Rb_tree_node_base* _Const_Base_ptr;

    _Rb_tree_color	_M_color;
    _Base_ptr		_M_parent;
    _Base_ptr		_M_left;
    _Base_ptr		_M_right;
};

template<typename _Val>
    struct _Rb_tree_node : public _Rb_tree_node_base {
     __gnu_cxx::__aligned_membuf<_Val> _M_storage;
};

from flare.

4kangjc avatar 4kangjc commented on May 5, 2024

只是刚好想到红黑树里的设计是这样的

struct _Rb_tree_node_base
  {
    typedef _Rb_tree_node_base* _Base_ptr;
    typedef const _Rb_tree_node_base* _Const_Base_ptr;

    _Rb_tree_color	_M_color;
    _Base_ptr		_M_parent;
    _Base_ptr		_M_left;
    _Base_ptr		_M_right;
};

template<typename _Val>
    struct _Rb_tree_node : public _Rb_tree_node_base {
     __gnu_cxx::__aligned_membuf<_Val> _M_storage;
};

类似于继承方向指针

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0x804d8000 avatar 0x804d8000 commented on May 5, 2024

作为不对外的内部实现的时候,有时候会更侧重开发成本之类的考量

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