On Jun 20, 2012, at 9:57 PM, Daniel Larimer wrote:
On Jun 20, 2012, at 7:36 PM, Joel de Guzman wrote:
On 6/20/2012 1:37 PM, Daniel Larimer wrote:
I recently attempted to update to gcc 4.7 and code that compiled with 4.5.3 broke.
It appears that boost::fusion expects boost::fusion::random_access_traversal_tag to implicitly cast to mpl::bool_<false>.
Switching the 3rd argument from mpl::bool_<false> to an extra template arg (that was ignored), seems to fix the compilation errors.
Compiled with std=c++11
Do you have a minimal test case?
#include <boost/fusion/container/vector.hpp> #include <boost/fusion/algorithm.hpp> #include <boost/fusion/include/make_vector.hpp>
struct visitor { template<typename T> void operator()( T t )const{} };
int main() { visitor v; boost::fusion::for_each( boost::fusion::make_vector(5,6.6), v ); return 0; }
I could get things to compile by editing boost/fusion/algorithm/iteration/detail/for_each.hpp and changing the last parameter to Ty. It appears that parameter was ignored anyway and that we didn't care about the type. template <typename Sequence, typename F, typename Ty> inline void for_each(Sequence& seq, F const& f, Ty) // unsegmented implementation { detail::for_each_dispatch(seq, f, typename traits::category_of<Sequence>::type()); }
Regards, -- Joel de Guzman http://www.boostpro.com http://boost-spirit.com
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