Boost C++ Libraries: Ticket #12645: error: no match for call to ‘(const hash) (const boost::recursive_variant_&)’

mike.gresens@… — Sat, 03 Dec 2016 17:26:34 GMT

Workaround for boost >= 1.62. Not sure what changed since 1.61...

code:

#include <boost/variant.hpp>
#include <unordered_set>
struct hash;
using int_t = int;
template <typename T>
using basic_set_t = std::unordered_set<T, hash>;
using value_t = boost::make_recursive_variant<
		int_t,
		basic_set_t<boost::recursive_variant_>
>::type;
using set_t = basic_set_t<value_t>;
struct hash
{
boost::recursive_variant_&)’
	size_t operator()(const value_t& value) const
	{
		return 0;
	}
};
// This helps for boost >= 1.62
namespace std
{
	template <>
	struct __is_fast_hash<::hash> : std::false_type { };
}
int main()
{
	set_t s;
	int_t i = 3;
	value_t v = i;
	s.emplace(v);
	v = s;
	return 0;
}

owner, status changed

Antony Polukhin — Mon, 02 Jan 2017 09:50:09 GMT

owner changed from ebf to Antony Polukhin
status new → assigned

Fixed by Mikhail Maximov in e0b65c01. Fix will appear in Boost 1.64

milestone changed

Antony Polukhin — Wed, 18 Jan 2017 19:36:58 GMT

milestone To Be Determined → Boost 1.64.0

status changed; resolution set

Antony Polukhin — Sat, 22 Apr 2017 06:01:33 GMT

status assigned → closed
resolution → fixed