MongoDB C++ Driver 3.0 get document in string and avoid json

c++ json mongodb c++11 mongo-cxx-driver

You can pull out the field you want directly as a double. To print high-precision output, you need to set that on the output stream. E.g.

for (auto&& doc : cursor) {    std::cout << std::setprecision(15)              << "lng: " << doc["lng"].get_double() << std::endl;}

Gives:

lng: -58.4682568037741

You may want to verify that doc["lng"] is a BSON double before calling get_double.

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