Trait method lrs::undef::UndefState::is_undef

Checks if a storage location is in an undefined state.

Syntax

unsafe fn is_undef(val: *const Self, n: usize) -> bool

Name	Description
val	A storage location suitable to hold an object of type `Self`.
n	The id of the undefined state.

This function behaves as follows:

If n is greater than or equal to Self::num(), the process is aborted.
If the storage location contains an object of type Self, false is returned.
If the storage location is in the undefined state m != n, false is returned.
If the storage location is in the undefined state n, true is returned.