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Merge pull request #96 from jcelerier/patch-1

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for_each_field_impl: use fold expressions if possible
This commit is contained in:
Antony Polukhin
2022-08-31 21:17:01 +03:00
committed by GitHub
parent 9bb809d2a5 7837449ca7
commit 4e84a5b159
1 changed files with 12 additions and 0 deletions
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12
include/boost/pfr/detail/for_each_field_impl.hpp
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@@ -29,6 +29,7 @@ void for_each_field_impl_apply(T&& v, F&& f, I /*i*/, int) {
std::forward<F>(f)(std::forward<T>(v));
}
#if !defined(__cpp_fold_expressions) || __cpp_fold_expressions < 201603
template <class T, class F, std::size_t... I>
void for_each_field_impl(T& t, F&& f, std::index_sequence<I...>, std::false_type /*move_values*/) {
const int v[] = {0, (
@@ -47,6 +48,17 @@ void for_each_field_impl(T& t, F&& f, std::index_sequence<I...>, std::true_type
)...};
(void)v;
}
#else
template <class T, class F, std::size_t... I>
void for_each_field_impl(T& t, F&& f, std::index_sequence<I...>, std::false_type /*move_values*/) {
(detail::for_each_field_impl_apply(sequence_tuple::get<I>(t), std::forward<F>(f), size_t_<I>{}, 1L), ...);
}
template <class T, class F, std::size_t... I>
void for_each_field_impl(T& t, F&& f, std::index_sequence<I...>, std::true_type /*move_values*/) {
(detail::for_each_field_impl_apply(sequence_tuple::get<I>(std::move(t)), std::forward<F>(f), size_t_<I>{}, 1L), ...);
}
#endif
}}} // namespace boost::pfr::detail