keen.benjamin.j@… — Fri, 11 Mar 2016 08:49:32 GMT

Problem still exists on 1.60.0, gcc 5.3.0 x86_64-unknown-linux-gnu (CentOS 7)

// if #include <boost/functional/hash.hpp> absent, link error on boost::filesystem::hash_range
// if present, no problem.
// #include <boost/functional/hash.hpp>
#include <boost/filesystem.hpp>
namespace std {
    template <> struct hash<boost::filesystem::path>
    {
        size_t operator()(const boost::filesystem::path& p) const
        {
            return boost::filesystem::hash_value(p);
        }
    };
}

For that matter, shouldn't the boost header put this specialization in the std:: namespace anyway?

Boost C++ Libraries: Ticket #8634: boost/filesystem/path.hpp is not self-sufficient