Ticket #11682: test-11681.cpp

#include <boost/fusion/include/pair.hpp>
#include <boost/fusion/include/std_tuple.hpp>

#include <tuple>
#include <iostream>

int main(){

        struct NotDefaultConstructible {
                NotDefaultConstructible(int){};
        };

        // prints 0
        std::cout << std::is_default_constructible< NotDefaultConstructible >::value << std::endl;

        using fusion_pair1 = boost::fusion::pair<int, NotDefaultConstructible>;

        // should print 0
        // fails to compile on clang (xcode 7, 3.4, 3.6, 3.7), gcc 4.9
        // prints 1 on gcc 5, clang 3.4
        std::cout << std::is_default_constructible< fusion_pair1 >::value << std::endl;

        return 0;
}