Re: [Boost-users] Valgrind false positive in make_shared

Subject: Re: [Boost-users] Valgrind false positive in make_shared
From: Peter Dimov (pdimov_at_[hidden])
Date: 2010-11-17 12:34:53

Frank Mori Hess wrote:
> On Tuesday 16 November 2010, Peter Dimov wrote:
> > Interesting... which version of GCC? Without the static_cast, it
> > shouldn't compile, as rvalue references no longer bind to lvalues. In
> > fact, I see that I added the static_cast in [61574] for that very 
> > reason.
>
> $ gcc --version
> gcc (Debian 4.3.2-1.1) 4.3.2
>
> Its implementation of std::forward looks like:
>
>   template<typename _Tp>
>     inline _Tp&&
>     forward(typename std::identity<_Tp>::type&& __t)
>     { return __t; }

So it appears that we need to revert to the old forward for 4.3 and earlier. 
The easiest would be to just use std::forward, but unfortunately, I remember 
that some earlier versions of the standard library didn't have it. :-/