Beman Dawes wrote:
Filesystem has a dependency on
in order to supply this: inline std::size_t hash_value(const path& x) { # ifdef BOOST_WINDOWS_API std::size_t seed = 0; for(const path::value_type* it = x.c_str(); *it; ++it) hash_combine(seed, *it == '/' ? L'\\' : *it); return seed; # else // BOOST_POSIX_API return hash_range(x.native().begin(), x.native().end()); # endif } ... Is there any recommended way to avoid the functional dependency?
In this specific case, I would forward-declare hash_combine and hash_range. I already submitted a pull request against array along the same lines, which Marshall graciously accepted. Had 'hash' been in its own module, I would consider simply including hash.hpp, rather than relying on forward declarations, as 'hash' should be a very lightweight module.