Re: [Boost-users] multi_index_container with protected constructor

Subject: Re: [Boost-users] multi_index_container with protected constructor
From: Pekka Seppänen (pekka.seppanen_at_[hidden])
Date: 2013-07-17 09:47:08

On 17.7.2013 16:07, Horváth Imre wrote:
> Hi,
>
> I want to use boost::multi_index_container with a class that have
> protected constructors, but the compile fails.
> I think I should make multi_index_container a friend of my class, but I
> don't know how.

I guess you don't want to do that (as quite likely you'd like to pass the 
instance around, ie. P, not create new n copies of Item), but add:

explicit

> 	Item(P item)
> 	: source(item->get_source())
> 	, target(item->get_target())
> 	{
> 	}

and it compiles. Yes, copy constructing via create(P item) works as expected 
with that trick done.

My compiler choked on types too much, so didn't look where it actually tries 
to construct shared_ptr< Item > and feed that to constructor. But I think this 
is the main cause anyway and explicit keyword is there to help you out.

-- Pekka