Using mongoDB 2.2, every time I connected to the server within a function, I did this:

boost::scoped_ptr<mongo::ScopedDbConnection> conn(mongo::ScopedDbConnection::getScopedDbConnection ("localhost" ) )

Then I would use conn->get() and when done conn->done().

In 3.3.5, I am doing this within each function:

mongocxx::instance inst{}; mongocxx::client conn{mongocxx::uri}

This is, apparently wrong to do this every time I want to make a connection. The first time, it works perfectly. The server window outputs:

connection accepted from 127.0.0.1:57896 #30 (2 connections now open)

and dutifully ends the connection at the end of the function block

end connection 127.0.0.1:57896 (1 connection now open).

(The 1 connection is the mongo shell). But when I repeat this in a subsequent block and try a command, it throws an exception:

No suitable servers found (`serverSelectionTryOnce` set): [Failed to resolve 'localhost']: generic server error.

So, am I supposed to create the instance/connection once and pass it to every function I write (since globals are evil)?