Am 20.12.19 um 11:25 schrieb Jonathan Wakely:
> On Fri, 20 Dec 2019, 08:39 Klaus Doldinger, <klaus.doldinger64@xxxxxxxxx> wrote:
>>
>>
>> Am 13.11.19 um 13:47 schrieb Jonathan Wakely:
>>> On Wed, 13 Nov 2019 at 11:43, Klaus Doldinger
>>> <klaus.doldinger64@xxxxxxxxx> wrote:
>>>>
>>>>
>>>>
>>>> Am 13.11.19 um 11:35 schrieb Jonathan Wakely:
>>>>> On Wed, 13 Nov 2019 at 09:24, Klaus Doldinger
>>>>> <klaus.doldinger64@xxxxxxxxx> wrote:
>>>>>>
>>>>>> Hi all,
>>>>>>
>>>>>> in the follwing example
>>>>>>
>>>>>> #include <compare> // omitting trigger ICE
>>>>>>
>>>>>> template<auto V>
>>>>>> struct A {};
>>>>>>
>>>>>> struct B {
>>>>>> inline constexpr auto operator<=>(const B& rhs) const = default;
>>>>>> private:
>>>>>> int value; // why must this member be public?
>>>>>> };
>>>>>>
>>>>>> int main() {
>>>>>> A<B{}> t;
>>>>>> }
>>>>>>
>>>>>> why must the member value be public?
>>>>>
>>>>> Looks like a bug, please report it to bugzilla.
>>>>
>>
>> Ok, we found this not to be a bug.
>>
>> But, how do I write a class to use as NTTP with private members?
>
>
> You don't.
Well, that is an extremly hard restriction, I think.
Are there reasons for that?
>>
>> I'm a bit confused about:
>>
>> https://en.cppreference.com/w/cpp/language/template_parameters
>>
>> Here string structural equality does not require all public members.
>> It must be literal and the members must be structural revursively.
>
>
> That page hasn't been edited in more than six months, it doesn't
> describe the current status of the C++20 draft.
Ok, thanks for clearifying that.
