Re: [boost] [fusion] unpack into constructor?

From: Tobias Schwinger (tschwinger_at_[hidden])
Date: 2007-06-15 16:42:17

Eric Niebler wrote:
> Tobias Schwinger wrote:
>> Tobias Schwinger wrote:
>>
>>>         // [...] tricky nullary case with default ctor detection
>>>         // omitted for simplicity
>>>
>> Doh! It's not possible to detect default constructibility, correct?
>>
>>
>> So we'd have to declare it as
>>
>>      template<typename T, typename DefaultConstructible = mpl::false_>
>>      struct constructor;
> 
> 
> No. If the interface is "construct<T>(sequence)", then you can dispatch 
> on the size of the sequence. You'd only try to default construct when 
> you pass an empty sequence.

True, but this is not the kind of interface the previous post was about.

Regards,
Tobias