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#include <array>
#include <cassert>
#include <pb_encode.h>

#include "addressbook_nanopb.pb.h"

static_assert(std::is_array<decltype(std::declval<tutorial_Person>().name)>::value, "");
static_assert(std::is_array<decltype(std::declval<tutorial_Person>().email)>::value, "");
static_assert(std::is_array<decltype(std::declval<tutorial_Person>().phones)>::value, "");

bool writeString(pb_ostream_t *stream, const pb_field_t *field, void *const *)
{
    constexpr auto str = "0123456789";
    if (!pb_encode_tag_for_field(stream, field))
        return false;
    return pb_encode_string(stream, reinterpret_cast<const uint8_t*>(str), strlen(str));
}

int main()
{
    std::array<uint8_t, 32> buffer = {};

    tutorial_Person_PhoneNumber phoneNumber;
    phoneNumber.number.funcs.encode = writeString;
    phoneNumber.type = tutorial_Person_PhoneType_WORK;

    auto ostream = pb_ostream_from_buffer(buffer.data(), buffer.size());
    assert(pb_encode(&ostream, tutorial_Person_PhoneNumber_fields, &phoneNumber));

    return 0;
}