//create a BSON document bsoncxx::builder::basic::document document; document.append(kvp("name", "John")); document.append(kvp("age", 25)); //retrieve a field from the document bsoncxx::types::b_string name = document.view()["name"].get_utf8();
//create a BSON document bsoncxx::builder::basic::document document; document.append(kvp("name", "John")); document.append(kvp("age", 25)); //retrieve a field from the document as an integer int age = document.view()["age"].get_int32();In this example, we create a BSON document with the fields "name" and "age". Then we use the getField function to retrieve the "age" field from the document as an integer. In both examples, the getField function is used to retrieve a specific field from a BSON document. The bsoncxx library from the Mongo C++ driver is used to create and manipulate BSON documents in C++.