Solved, by moving the decode() inside the lambda, and adding the `.template
` for GCC (MSVC was happy w/o it...)
A miraculous inspiration I guess. Unusual the ML is silent like this. Must
have been a question asked the wrong way. --DD
static void decode(Decoder& d, std::variant<Ts...>& var) {
const size_t index = d.decodeUnionIndex();
if (index >= sizeof...(Ts)) {
throw avro::Exception("Invalid Union index");
}
boost::mp11::mp_with_index<sizeof...(Ts)>(
index, [&](auto Idx) {
constexpr size_t alternative_index = Idx;
avro::decode(d, var.template emplace<alternative_index>());
}
);
}
On Wed, Jun 30, 2021 at 3:27 PM Dominique Devienne <ddevie...@gmail.com>
> wrote:
>
>> Hi. I'm modernizing some code, to use std::variant instead of ad-hoc
>> peudo-variant structs.
>> These structs need to be encoded/decoded via avro::codec_traits
>> specializations, but given
>> that std::variant is variadic, I'm struggling a bit. I've done my
>> research and found peter's [1] and also looked at [2],
>>
> which I thought might work, but does not, and I don't understand the
>> errors I'm getting with MSVC 2019 in C++17 mode.
>>
>
_______________________________________________
Boost-users mailing list
Boost-users@lists.boost.org
https://lists.boost.org/mailman/listinfo.cgi/boost-users
