Re: [boost] [smart_ptr] error with nullptr_t

Subject: Re: [boost] [smart_ptr] error with nullptr_t
From: Peter Dimov (lists_at_[hidden])
Date: 2012-12-11 14:47:50

Vicente J. Botet Escriba wrote:
> Hi,
>
> next follows  a compile error with clang 3.1 c++11 just including
>
> #include <boost/shared_ptr.hpp>
>
> iMac-de-Vicente-Botet-Escriba:test viboes$ time bjam toolset=clang-3.1x 
> ts_ -q
> ...patience...
> ...found 1100 targets...
> ...updating 50 targets...
> clang-darwin.compile.c++ 
> ../../../bin.v2/libs/thread/test/test_so.test/clang-darwin-3.1x/debug/threading-multi/test_so.o
> In file included from ../example/test_so.cpp:6:
> In file included from ../../../boost/shared_ptr.hpp:17:
> ../../../boost/smart_ptr/shared_ptr.hpp:344:22: error: non-friend class 
> member 'nullptr_t' cannot have a qualified name
>      shared_ptr( std::nullptr_t ) BOOST_NOEXCEPT : px( 0 ), pn() // never 
> throws
>                  ~~~~~^

This is probably another manifestation of the issue with clang supporting 
the c++11 core language, but the libstdc++ not supporting it, namely, 
<ctsddef> not defining nullptr_t. I'm not sure how to fix that. 
!defined(BOOST_NO_CXX11_NULLPTR) does, in my opinion, imply that 
std::nullptr_t is present (along with nullptr itself). It's not clear how a 
library could offer nullptr support without using nullptr_t.