AMDG On 03/13/2014 01:09 PM, Samuel Christie wrote:
Thanks again for your help. I was also able to get that example to compile, which was perfect. Unfortunately, it seems rather fragile. I had copied most of the pieces over into a split test.hpp/test.cpp, and kept getting errors. I did eventually resolve the problem by more completely replacing them with your code directly, but I wasn't able to figure out what was causing the problem. Of course, that means when I tried to apply it to my real code, I ended up with the same error:
Make sure that everything is in scope: #include <boost/mpl/eval_if.hpp> #include <boost/mpl/identity.hpp> #include <boost/type_erasure/is_placeholder.hpp> Qualify the names boost::mpl::eval_if, boost::mpl::identity, and boost::type_erasure::is_placeholder if necessary.
solution.hpp:36:3: error: template argument 1 is invalid solution.hpp:36:4: error: expected identifier before '::' token solution.hpp:36:6: error: typedef name may not be a nested-name-specifier solution.hpp:36:6: error: expected ';' at end of member declaration solution.hpp:36:11: error: 'type' does not name a type solution.hpp:52:3: error: template argument 1 is invalid solution.hpp:52:4: error: expected identifier before '::' token solution.hpp:52:6: error: typedef name may not be a nested-name-specifier solution.hpp:52:6: error: expected ';' at end of member declaration solution.hpp:52:11: error: 'type' does not name a type
the relevant pieces of code were the following:
31 template<class T> 32 struct get_neighborhood_type { 33 typedef typename mpl::eval_if<is_placeholder<T>, 34 mpl::identity<void>, 35 get_neighborhood_type_impl<T> 36 >::type type; 37 };
<snip>
In Christ, Steven Watanabe