Re: [boost] [swap] End-user allowed to add overloads to boost namespace?

From: Niels Dekker - mail address until 2008-12-31 (nd_mail_address_valid_until_2008-12-31_at_[hidden])
Date: 2008-07-31 17:20:18

Michael Marcin wrote:
> I remember reading or hearing a long time ago that in C++0x it is an
> error to call std::swap(x,y) directly and you have to do using
> std::swap; swap(x,y);.

Curiously, last year I worried about getting a C++0x error from doing
just that: "using std::swap; swap(x,y);"!  Especially when one would use
the C++0x std::Swappable concept. Douglas Gregor dedicated a blog entry
to the issue: 
http://conceptgcc.wordpress.com/2007/01/02/revisiting-name-lookup-with-the-swap-example/

> This seems very unfortunate especially since boost can get us
> ADL swap without that in C++03. Does anyone know if
> this is still true?

I really don't know. I /think/ that the current version of the
boost::swap utility should work in C++0x as well, at least in C++0x code
that doesn't have concept checking. Of course, boost::swap doesn't yet
support an rvalue as argument, like C++0x's std::swap will. But other
than that, I think it should work fine. Please let me know if I'm wrong!

Good night, Niels