Re: [boost] [config] std::unique_ptr, std::ref detection?

Subject: Re: [boost] [config] std::unique_ptr, std::ref detection?
From: Peter Dimov (pdimov_at_[hidden])
Date: 2012-02-28 15:07:33

John Maddock wrote:
> > Suppose I want to implement a shared_ptr constructor taking 
> > std::unique_ptr. To avoid breaking pre-C++11 compilers, I need to, at 
> > least, know whether <memory> contains std::unique_ptr. (I'd also like to 
> > know if there's std::ref in <functional> because the specification of 
> > the constructor uses it.) But the config library doesn't seem to provide 
> > a way. There's no macro for std::unique_ptr, and there's no macro for 
> > "generic C++11 compiler and library".
>
> I'd prefer not to get too fine grained about this if possible, but are 
> these the only additions to those headers?  If so how about 
> BOOST_NO_0X_HDR_MEMORY and BOOST_NO_0X_HDR_FUNCTIONAL which would mirror 
> the existing macros fairly closely?

No, these are not the only additions; <memory> has at least shared_ptr and 
weak_ptr in C++11, and <functional> has function, bind, mem_fn, hash. But it 
looks workable enough. I agree that adding a macro for each and every 
addition would get unwieldy.