私有继承和交换
我在两个非常相关的类的实现中使用私有继承。
using Base::X;
class A
{
public:
iterator begin();
const_iterator begin() const;
const_iterator cbegin() const;
A clone();
void swap( A& other );
};
class Const_A : private A
{
public:
// I think using A::A; will be valid in C++0x
Const_A( const A& copy) : A(copy) { }
// very elegant, concise, meaningful
using A::cbegin;
// I'd love to write using A::begin;, but I only want the const overload
// this is just forwarding to the const overload, still elegant
const_iterator begin() const
{ return A::begin(); }
// A little more work than just forwarding the function but still uber simple
Const_A clone()
{ return Const_A(A::clone()); }
// What should I do here?
void swap( Const_A& other )
{ /* ??? */ }
};
A::swap
Const_A::swap
没有找到相关结果
已邀请:
2 个回复
旦彤
版本吗？void swap( Const_A& other ) { A::swap(other); // swaps the `A` portion of `this`. // … }，你通常只交换而不是的成员，但由于你的特殊情况没有，这就是你应该需要的。功飘
void Const_A::swap( Const_A& other ) { A::swap(other); // here any specifics }