79 lines
1.3 KiB
C++
79 lines
1.3 KiB
C++
// Copyright 2021, 2022 Peter Dimov
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// Distributed under the Boost Software License, Version 1.0.
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// https://www.boost.org/LICENSE_1_0.txt
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#include <boost/container_hash/hash.hpp>
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#include <boost/describe.hpp>
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#include <boost/mp11.hpp>
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#include <boost/variant2/variant.hpp>
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#include <boost/version.hpp>
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#include <vector>
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using namespace boost::describe;
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namespace app
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{
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#if BOOST_VERSION < 108100
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template<class T,
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class Bd = describe_bases<T, mod_any_access>,
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class Md = describe_members<T, mod_any_access>,
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class En = std::enable_if_t<!std::is_union<T>::value> >
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std::size_t hash_value( T const & t )
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{
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std::size_t r = 0;
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boost::mp11::mp_for_each<Bd>([&](auto D){
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using B = typename decltype(D)::type;
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boost::hash_combine( r, (B const&)t );
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});
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boost::mp11::mp_for_each<Md>([&](auto D){
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boost::hash_combine( r, t.*D.pointer );
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});
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return r;
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}
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#endif
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struct A
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{
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int x = 1;
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};
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BOOST_DESCRIBE_STRUCT(A, (), (x))
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struct B
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{
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int y = 2;
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};
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BOOST_DESCRIBE_STRUCT(B, (), (y))
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struct C
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{
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std::vector<boost::variant2::variant<A, B>> v;
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};
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BOOST_DESCRIBE_STRUCT(C, (), (v))
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} // namespace app
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#include <iostream>
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int main()
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{
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app::C c;
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c.v.push_back( app::A{} );
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c.v.push_back( app::B{} );
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std::cout << boost::hash<app::C>()( c ) << std::endl;
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}
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