title: How to disconnect a lambda function without storing connection
body: <p>Is there a way to disconnect <code>Qt</code> connections that are made to lambda functions without storing connection objects?</p>
  
  <p>I know it's possible to do if I store the <code>QMetaObject::Connection</code> returned from the connect function, but I don't really want to do that because there would be a ton of them. I mainly connect to lambda functions to avoid creating a bunch of one-off methods and objects, and it seems like if I need to do all that bookkeeping that <code>SLOTs</code> would be more preferable.</p>