79 lines
1.3 KiB
C++
79 lines
1.3 KiB
C++
|
// Copyright 2021, 2022 Peter Dimov
|
||
|
|
// Distributed under the Boost Software License, Version 1.0.
|
||
|
|
// https://www.boost.org/LICENSE_1_0.txt
|
||
|
|
|
||
|
|
#include <boost/container_hash/hash.hpp>
|
||
|
|
#include <boost/describe.hpp>
|
||
|
|
#include <boost/mp11.hpp>
|
||
|
|
#include <boost/variant2/variant.hpp>
|
||
|
|
#include <boost/version.hpp>
|
||
|
|
#include <vector>
|
||
|
|
|
||
|
|
using namespace boost::describe;
|
||
|
|
|
||
|
|
namespace app
|
||
|
|
{
|
||
|
|
|
||
|
|
#if BOOST_VERSION < 108100
|
||
|
|
|
||
|
|
template<class T,
|
||
|
|
class Bd = describe_bases<T, mod_any_access>,
|
||
|
|
class Md = describe_members<T, mod_any_access>,
|
||
|
|
class En = std::enable_if_t<!std::is_union<T>::value> >
|
||
|
|
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;
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif
|
||
|
|
|
||
|
|
struct A
|
||
|
|
{
|
||
|
|
int x = 1;
|
||
|
|
};
|
||
|
|
|
||
|
|
BOOST_DESCRIBE_STRUCT(A, (), (x))
|
||
|
|
|
||
|
|
struct B
|
||
|
|
{
|
||
|
|
int y = 2;
|
||
|
|
};
|
||
|
|
|
||
|
|
BOOST_DESCRIBE_STRUCT(B, (), (y))
|
||
|
|
|
||
|
|
struct C
|
||
|
|
{
|
||
|
|
std::vector<boost::variant2::variant<A, B>> v;
|
||
|
|
};
|
||
|
|
|
||
|
|
BOOST_DESCRIBE_STRUCT(C, (), (v))
|
||
|
|
|
||
|
|
} // namespace app
|
||
|
|
|
||
|
|
#include <iostream>
|
||
|
|
|
||
|
|
int main()
|
||
|
|
{
|
||
|
|
app::C c;
|
||
|
|
|
||
|
|
c.v.push_back( app::A{} );
|
||
|
|
c.v.push_back( app::B{} );
|
||
|
|
|
||
|
|
std::cout << boost::hash<app::C>()( c ) << std::endl;
|
||
|
|
}
|