The PermissionsChecker class is a convenience mangler. It collects a set of Permissions and Permissions::Right objects, and checks that all are allowed. If not, it generates a suitable error message.
Constructs an empty PermissionsChecker. Pretty much a noop.
If ready() returns false, this function returns an almost random string.
Returns a Permissions object for m, u if this PermissionsChecker happens to have one, and returns a null pointer if it doesn't.
Returns true if this checker can return a valid result, and false if at least one Permissions object still doesn't have the data it needs.
Notes that this object's user requires r on p.
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