id,summary,reporter,owner,description,type,status,milestone,component,version,severity,resolution,keywords,cc
9153,Building boost::log in Sun Studio 12.3: boost::log::aux::light_function fails to build,Brian Vandenberg <phantall+boost@…>,Andrey Semashev,"I get an error building boost::log in Sun Studio 12.3, while building anything that uses '''light_function_pp.hpp''':

{{{
""./boost/log/detail/light_function_pp.hpp"", line 44: Error: Multiple declaration for impl.
""./boost/log/expressions/filter.hpp"", line 58:     Where: While specializing ""boost::log::v2_mt_posix::aux::light_function<bool(const boost::log::v2_mt_posix::attribute_value_set&)>"".
""./boost/log/expressions/filter.hpp"", line 58:     Where: Specialized in non-template code.
}}}

I can reproduce this problem on a much smaller scale:

{{{
template < typename SignatureT >
class light_function ;

template < typename ResultT, typename ArgT0 >
class light_function < ResultT ( ArgT0 ) > {
private:
  struct impl_base {};
  impl_base *m_pImpl;

#if defined( BREAK_IT )
  template < typename FunT >
  class impl;
  template < typename FunT >
  friend class impl;
#endif

  template < typename FunT >
  class impl : public impl_base {};

#if !defined( BREAK_IT )
  template < typename FunT >
  friend class impl;
#endif

public:
  template <typename T>
  light_function( T const &t ) : m_pImpl( static_cast<impl_base*)new impl<T>() ) {}
};

int main( int argc, char *argv[] ) {
  light_function<bool(int&)> lf(3);

  return 0;
}
}}}

When compiled in Linux or Solaris with SS12.3, I get the exact same error.",Bugs,closed,To Be Determined,log,Boost 1.54.0,Problem,fixed,,phantall+boost@…