Le 15/07/2012 19:24, Eric Niebler a écrit :
The following reasonable-seeming use of mpl::plus doesn't compile:
#include <utility> #include <boost/mpl/plus.hpp>
typedef std::integral_constant<int, 1> one; typedef boost::mpl::plus<one, one>::type two;
That's because mpl only works with its own integral constant wrappers, not the standard one. That seems unfortunate to me. Is there any interest in supporting this?
Here's the error (from clang trunk with glibc++):
This could be done by making all T::tag stuff in mpl us a tag_of<T>::type appraoch a la Fusion, we can then allow arbitrary types to model MPL Concepts. Now, in presence of std::integral_constant maybe mpl shoudl just do using std::integral_constant; in addition to the previous fix.