Re: [boost] [core] Breaking change to boost::ref in 1.56

Subject: Re: [boost] [core] Breaking change to boost::ref in 1.56
From: Peter Dimov (lists_at_[hidden])
Date: 2014-07-13 05:48:30

Andrey Semashev wrote:
> Perhaps Eric could provide more context on why Boost.Proto needs recursive 
> reference wrappers? Frankly, the requirement looks strange to me.

Generic code that does

    boost::reference_wrapper<T> r = boost::ref( t );

is broken when t is a reference_wrapper.

> I'm not strongly opposed to reverting, but the change looks justified 
> enough to me. Allowing dangling reference wrappers is surely not the 
> correct behavior.

Dangling reference wrappers are prevented by a separate and independent 
change

https://github.com/boostorg/core/commit/45f7564db29a3bafa5dfd8c41396843493d1378a

that is (I think) not affected by the removal of the collapsing overloads.