Gets the MainContext with which the source is associated.
You can call this on a source that has been destroyed, provided that the MainContext it was attached to still exists (in which case it will return that MainContext). In particular, you can always call this function on the source returned from current_source. But calling this function on a source whose MainContext has been destroyed is an error.
| this |
|
the MainContext with which the source is associated, or null if the context has not yet been added to a source. |