pub enum Traversal {
Absent(usize),
TooShort(usize),
NotFound(usize),
TooLong(usize),
Access(usize, &'static str),
Invalid(usize, &'static str),
}Expand description
Errors that can occur when using the Tree traits.
A usize member indicates the key depth where the error occurred.
The depth here is the number of names or indices consumed.
It is also the number of separators in a path or the length
of an indices slice.
If multiple errors are applicable simultaneously the precedence is as per the order in the enum definition (from high to low).
Variants§
Absent(usize)
A node does not exist at runtime.
An enum variant in the tree towards the node is currently absent.
This is for example the case if an Option using the Tree*
traits is None at runtime. See also crate::TreeKey.
TooShort(usize)
The key ends early and does not reach a leaf node.
NotFound(usize)
The key was not found (index parse failure or too large, name not found or invalid).
TooLong(usize)
The key is too long and goes beyond a leaf node.
Access(usize, &'static str)
A node could not be accessed.
The get or get_mut accessor returned an error message.
Invalid(usize, &'static str)
A deserialized leaf value was found to be invalid.
The validate callback returned an error message.