在“ C ++入门5”中说：

如果基类具有不可访问的或已删除的析构函数，则派生类中的综合默认构造函数和复制构造函数被定义为已删除，因为无法破坏派生对象的基部。

class A
{
    virtual ~A() = delete;
};

class B : public A
{ 
    public:
      //B(){} // synthesized as a deleted member
      //B(const B&){} // synthesized as a deleted member
      //~B() is synthesized as deleted member
};

我得到了背后的原因，但是对我来说重要的是：这是否意味着从具有无法访问/删除的析构函数的基类派生的类也阻止了用户定义的ctor，copy-ctor和dtor？