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Document the unions behavior and fix #22

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Antony Polukhin
2018-06-12 13:06:37 +03:00
parent 8efe184b7a
commit aec668962d
6 changed files with 46 additions and 11 deletions
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misc/generate_cpp17.py
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@@ -70,7 +70,7 @@ template <class T>
constexpr auto tie_as_tuple(T& val) noexcept {
static_assert(
!std::is_union<T>::value,
"====================> Boost.PFR: For safety reasons it is forbidden to reflect unions. It could lead to crashes (for example when attempting to output the union with inactive first `const char*` field)."
"====================> Boost.PFR: For safety reasons it is forbidden to reflect unions. See `Reflection of unions` section in the docs for more info."
);
typedef size_t_<fields_count<T>()> fields_count_tag;
return boost::pfr::detail::tie_as_tuple(val, fields_count_tag{});