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From: Tobias Schwinger (tschwinger_at_[hidden])
Date: 2007-04-04 05:28:31

Andrey Semashev wrote:
> Hello Tobias,
> Tuesday, April 3, 2007, 9:02:45 PM, you wrote:
>> Hi,
>> in_place_factory can be quite useful, as I found out recently. However,
>> here are some suggestions to make it event better:
>> 1. add a construction mechanism for arrays
>> 2. add a note to the docs about deduction and using boost::ref
>> 3. have the static 'apply' member function return the pointer to the
>> constructed object - just like the placement new operator
>> 4. use file iteration instead of BOOST_PP_REPEAT for maintainability
> If I may, I'd like to add:
> 5. add in_place_factory and typed_in_place_factory for zero
> constructor arguments.

Quick discussion:

Often the reason against nullary function overloads is the earlier point
of instantiation (nullary functions can't be templates), but that
shouldn't be the problem here because 'in_place_factory's nested 'apply'
is a template and 'typed_in_place_factory' is complete enough to be
instantiated. For the 'inline in_place_factory0 in_place()' function the
explicit 'inline' keyword is needed, however, not to break the ODR.

OK. It seems reasonable and it seems there are no unsolvable problems
around, so let's add it ;-).

> I remember someone mentioned this before, but I
> can't remember any one answered.

That probably means that there's no maintainer. If that's so, I'd pick
up this role.


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