Created
March 3, 2021 15:26
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#include <boost/describe.hpp> | |
#include <boost/mp11.hpp> | |
#include <boost/container_hash/hash.hpp> | |
#include <variant> | |
using namespace boost::describe; | |
namespace app | |
{ | |
template<class T, | |
class Bd = describe_bases<T, mod_any_access>, | |
class Md = describe_members<T, mod_any_access>> | |
std::size_t hash_value( T const & t ) | |
{ | |
std::size_t r = 0; | |
boost::mp11::mp_for_each<Bd>([&](auto D){ | |
using B = typename decltype(D)::type; | |
boost::hash_combine( r, (B const&)t ); | |
}); | |
boost::mp11::mp_for_each<Md>([&](auto D){ | |
boost::hash_combine( r, t.*D.pointer ); | |
}); | |
return r; | |
} | |
struct A | |
{ | |
int x = 1; | |
}; | |
BOOST_DESCRIBE_STRUCT(A, (), (x)) | |
struct B | |
{ | |
int y = 2; | |
}; | |
BOOST_DESCRIBE_STRUCT(B, (), (y)) | |
struct C | |
{ | |
std::vector<std::variant<A, B>> v; | |
}; | |
BOOST_DESCRIBE_STRUCT(C, (), (v)) | |
} // namespace app | |
#include <iostream> | |
int main() | |
{ | |
app::C c; | |
std::cout << boost::hash<app::C>()( c ) << std::endl; | |
} |
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