Det siger, hvad der står, initialiserede din driver først. hvis du har kompileret din driver korrekt, skal disse koder virke.
#include <cstdlib>
#include <iostream>
#include <bsoncxx/builder/stream/document.hpp>
#include <bsoncxx/json.hpp>
#include <mongocxx/client.hpp>
#include <mongocxx/instance.hpp>
#include <mongocxx/uri.hpp>
using bsoncxx::builder::stream::close_document;
using bsoncxx::builder::stream::document;
using bsoncxx::builder::stream::finalize;
using bsoncxx::builder::stream::open_document;
mongocxx::instance instance{};// don't put inside main
int main() {
mongocxx::client conn{ mongocxx::uri{ "mongodb://localhost:27017" } };
auto coll = conn["test"]["coll"];
bsoncxx::builder::stream::document document{};
document << "Data" << "hello";
coll.insert_one(document.view());
return 0;
}