[variant] Bug in recursive_wrapper_fwd.hpp

[nobody]

I've been tracking down an preprocessor warning involving the  
redefinition of BOOST_TT_AUX_BOOL_TRAIT_DEF1.  It appears to me that 
variant/recursive_wrapper_fwd.hpp is misusing:

#include "boost/type_traits/detail/bool_trait_def.hpp"

The usual include pattern for this header is:

// should be the last #include
#include "boost/type_traits/detail/bool_trait_def.hpp"

...

#include "boost/type_traits/detail/bool_trait_undef.hpp"

But recursive_wrapper_fwd.hpp has:

#include "boost/type_traits/detail/bool_trait_def.hpp"
#include "boost/mpl/aux_/lambda_support.hpp"

...

and no include for bool_trait_undef.hpp.  This is causing a redefinition 
warning on Apple darwin for BOOST_TT_AUX_BOOL_TRAIT_DEF1.  
Changing recursive_wrapper_fwd.hpp to the usual use pattern of 
bool_trait_def.hpp as described above silences the warning.

Thanks,
Howard
hinnant@twcny.rr.com

[ebf]

Logged In: YES 
user_id=120427

Hi Howard,

Thanks for the report. I committed a change that hopefully
resolves the issue.

Best,

Eric