Function null_example

examples/src/bson_examples.cpp:165–173

}

void null_example()
{
    json j;
    j.try_emplace("hello", json::null()); 

    std::vector<char> buffer;
    bson::encode_bson(j, buffer);
    std::cout << jsoncons::byte_string_view(buffer) << "\n\n";
}

void duration_example1()
{