C++11/14/17 : template class pointer as template parameter

Question

<分区>

Answer 1

你可以这样做(用 clang 编译很好，用 gcc 给 ICE):

template <typename FirstType, typename... TypesRemaining>
class MyClass
{
  // ...
};

template<int n, auto ptr> class
myFunction_impl;

template
<
    int n
,   typename FirstType
,   typename... TypesRemaining
,   MyClass<FirstType, TypesRemaining...> * ptr
> class
myFunction_impl<n, ptr>
{
    public: static void
    impl(void)
    {
        //  ...
    }
};

template<int n, auto ptr> auto
myFunction(void)
{
    return(myFunction_impl<n, ptr>::impl());
}

int main()
{
    myFunction<0, static_cast<MyClass<int, int, int> *>(nullptr)>();
    return 0;
}

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