Boost C++ Libraries: Ticket #6791: Support boost::array

owner, component changed

Daniel James — Sat, 14 Apr 2012 16:39:37 GMT

owner changed from Daniel James to Marshall Clow
component hash → array

It isn't possible to do it generically, because equality isn't always defined the same for all containers.

Support needs to be added to array itself, which is pretty easy, it just needs to include <boost/functional/hash_fwd.hpp> and then add something like the following to the same namespace as array (so that it will be picked up by ADL):

template<....>
std::size_t hash_value(array<....> const& x) {
    return boost::hash_range(x.begin(), x.end());
}

status changed; resolution set

Marshall Clow — Sat, 14 Apr 2012 18:07:37 GMT

status new → closed
resolution → fixed

(In [77976]) Added support for Boost.Hash to Boost.Array; fixes #6791

Sat, 14 Apr 2012 20:05:19 GMT

It isn't possible to do it generically, because equality isn't always defined the same for all containers.

Does that matter? Can't you just do "return boost::hash_range(x.begin(), x.end());"?

Support needs to be added to array itself,

What about std::array?