但是,我还需要检查一下这个继承是否公开,这怎么可以实现呢？

作为参考,这里是一个剥离版本的类,我有std :: is_base_of在那里.

template<class CustomSink>
class Sink
{
    static_assert(std::is_base_of<BaseSink,CustomSink>::value,"CustomSink must derive from BaseSink");
    //Some static assert here to check if custom sink has publicly inherited BaseSink 
    //static_assert(is_public.....
public:
    template<class... Args>
    Sink(Args&&... args)
    {
    }
    ~Sink()
    {
    }       
};

解决方法

template <class T>
std::true_type is_public_base_of_impl(T*);

template <class T>
std::false_type is_public_base_of_impl(...);

template <class B,class D>
using is_public_base_of = decltype(is_public_base_of_impl<B>(std::declval<D*>()));

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