Patch: bug fix for PR18218

[Howard Hinnant]

On Dec 29, 2013, at 4:38 PM, Matt Calabrese <rivorus at gmail.com> wrote:

> Woops, yeah I meant const and non const.

I believe that will break with an rvalue X where the conversion function is non-const.  I think we'll have to break something in C++03 (unless someone has another great idea...).  Breaking non-copyable, non-movable numeric types seems like the safest thing to break.

Howard