За добавяне на масив към поточен документ използвайте open_array
:
using bsoncxx::builder::stream::document;
using bsoncxx::builder::stream::open_array;
using bsoncxx::builder::stream::close_array;
using bsoncxx::builder::stream::finalize;
document data_builder{};
data_builder << "_id" << 5;
auto array_builder = data_builder << "my_array" << open_array;
for (float i = 0 ; i < 5 ; i = i + 0.1f) {
array_builder << i;
}
array_builder << close_array;
bsoncxx::document::value doc = data_builder << finalize;
std::cout << bsoncxx::to_json(doc) << std::endl;