Trait TopologyCounts 

pub trait TopologyCounts: TopologyBase {
    // Required methods
    fn element_count(&self) -> usize;
    fn relation_count(&self) -> usize;
}

Count capability for a topology view.

This trait is separated from TopologyBase because counts are a capability. Some views can report global counts cheaply; others expose only local, paged, generated, or filtered topology and should define counts only when the result is meaningful for that view.

Performance

Methods should be O(1) unless an implementation documents a weaker contract.

Required Methods

fn element_count(&self) -> usize

Returns the number of elements visible in this topology view.

Performance

Expected O(1) unless the implementation documents otherwise.

fn relation_count(&self) -> usize

Returns the number of relations visible in this topology view.

Performance

Expected O(1) unless the implementation documents otherwise.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors