Why is ADL not working with Boost.Range?

Question

Considering:

#include 
#include 
#include 

int main() {
    auto range = boost         


        

Answer 1

That's because boost::end is inside an ADL barrier, which is then pulled in boost at the end of the file.

However, from cppreference's page on ADL (sorry, I don't have a C++ draft handy):

1) using-directives in the associated namespaces are ignored

That prevents it from being included in ADL.