Nested sets and conversions between them. Useful to work with substructures. It is preferable
to implement the
SupersetOf trait instead of
SubsetOf whenever possible (because
SupersetOf is automatically implemented whenever
The notion of "nested sets" is very broad and applies to what the types are supposed to represent, independently from their actual implementation details and limitations. For example:
- f32 and f64 are both supposed to represent reals and are thus considered equal (even if in practice f64 has more elements).
- u32 and i8 are respectively supposed to represent natural and relative numbers. Thus, i8 is a superset of u32.
- A quaternion and a 3x3 orthogonal matrix with unit determinant are both sets of rotations. They can thus be considered equal.
In other words, implementation details due to machine limitations are ignored (otherwise we could not even, e.g., convert a u64 to an i64). If considering those limitations are important, other crates allowing you to query the limitations of given types should be used.
fn is_in_subset(&self) -> bool
self is actually part of its subset
T (and can be converted to it).
unsafe fn to_subset_unchecked(&self) -> T
Use with care! Same as
self.to_subset but without any property checks. Always succeeds.
fn from_subset(element: &T) -> Self
The inclusion map: converts
self to the equivalent element of its superset.
The inverse inclusion map: attempts to construct
self from the equivalent element of its
element has no equivalent in