Re: [boost] boost::factory?

From: Tobias Schwinger (tschwinger_at_[hidden])
Date: 2007-06-19 07:06:44

David Abrahams wrote:
> on Sun Jun 17 2007, Tobias Schwinger <tschwinger-AT-isonews2.com> wrote:
>> Interface draft:
>> ================
>>
>>      factory<T>     // constructs X and returns it by value
>>      factory<T*>    // uses operator new, returns a pointer
> 
> auto_ptr, please.

Generic algorithms won't 'get' it.

In this light, it seems better to have a separate template for pointers, 
so you clients can specify what they want, explicitly:

     new_< T* >
     new_< auto_ptr<T> >
     new_< special_smartie<T> >

(Seems tricky to deduce T but it might be doable).

>> Where operator() takes a variable number of arguments, forwarded to the
>> constructor.
> 
> 
> Isn't in-place construction the most general case?

It sure is, but not necessarily the most handy. How to tell e.g. 
std::transform to allocate memory for the transformed elements?

Not sure I really got your point, here.

Regards,
Tobias