将BSON数组添加到MongoDB 3.2文档并提取值(MongoCXX 3.2)(C++11)

Question

    // The document I want to add data to and extract it back from c++
           bsoncxx::builder::stream::document data_builder,
           // I want to try and save this array in my document , as I want to  populate it later
           bsoncxx::builder::stream::array mybsonarr;
           for(float i = 0 ; i < 5 ; i = i + 0.1f){
             mybsonarr << i;
           }

// Now this line Throws an error 
data_builder << "_id" << 5 << "my_array" << &mybsonarr;

那么我如何添加我的数组，以及如何将我的浮点数组读回数组和数组或向量？

Answer 1

要将数组添加到流文档，请使用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;