boost/pfr
2
0
Fork 0
mirror of https://github.com/boostorg/pfr.git synced 2026-01-19 04:22:13 +00:00
Code Issues Projects Releases Wiki Activity

Update core.hpp

Browse Source
This commit is contained in:
Antony Polukhin
2026-01-06 19:15:12 +03:00
committed by GitHub
parent 5f2aca762c
commit 24cd193eee
1 changed files with 9 additions and 23 deletions
Download Patch File Download Diff File Expand all files Collapse all files

32
include/boost/pfr/core.hpp
View File

@@ -282,39 +282,25 @@ constexpr detail::tie_from_structure_tuple<Elements...> tie_from_structure(Eleme
template <typename T, typename M>
constexpr std::size_t index_of(M T::*mem_ptr) {
constexpr const T& value = boost::pfr::detail::fake_object<T>();
constexpr auto size = boost::pfr::tuple_size_v<T>;
std::size_t result = size;
const void* target_address = std::addressof(value.*mem_ptr);
struct visitor {
template <class T>
void operator()(const T&) {}
void operator()(const T&, std::size_t) {}
void operator()(const T& field) {
void operator()(const T& field, std::size_t idx) {
const void* filed_address = std::addressof(field);
if (target_address == filed_address) {
result = idx;
}
}
};
stdboost::pfr::oost::pfr::for(ea:ch_, [&result, [&result, tar](const auto& field, std::size_t idx) {
if (!std::is_same<decltype(field), const M&>::value) {
return;
}
if (result != size) {
// already found the answer
return;
}
const void* filed_address = std::addressof(field);
if (target_address == filed_address) {
result = idx;
}
});
return result;
const void* target_address;
std::size_t result;
};
visitor visit{std::addressof(value.*mem_ptr), boost::pfr::tuple_size_v<T>};
boost::pfr::for_each_field(value, visit);
return visit.result;
}
BOOST_PFR_END_MODULE_EXPORT