Re: [Boost-users] shared_ptr / auto_ptr

Subject: Re: [Boost-users] shared_ptr / auto_ptr
From: Peter Dimov (pdimov_at_[hidden])
Date: 2010-02-23 13:12:13

Chard wrote:
> We've recently been evaluating a move from boost 1.38 to 1.42
> [MSVC71], and we had some code that breaks down to the following:
>
> [1] struct T {};
> [2] std::auto_ptr<T> ap;
> [3] boost::shared_ptr<T> sp = ap;
>
> Line [3] stopped compiling because of the 'explicit' introduced (in
> shared_ptr.hpp) at line [L] (below).

...

> - the 'explicit' appears to have been removed at version 1.35 (i.e.
> it was there at 1.34) and then re-introduced at 1.39.  Is there some
> history to this?

"svn blame" says that the explicit has reappeared in revision 52454:

https://svn.boost.org/trac/boost/changeset/52454

It references ticket #2951:

https://svn.boost.org/trac/boost/ticket/2951

This is the test that was supposed to be failing but passed without 
"explicit":

https://svn.boost.org/trac/boost/browser/trunk/libs/smart_ptr/test/auto_ptr_lv_fail.cpp