Struct ColumnInstanceSet 

pub struct ColumnInstanceSet {
    pub columns: Vec<ColumnInstance>,
    pub generation: u64,
}

A collection of ColumnInstances with a generation counter.

Fields

columns: Vec<ColumnInstance>

The column instances.

generation: u64

Structural generation counter. Bump when the number or identity of columns changes.

Implementations

impl ColumnInstanceSet

pub fn new(columns: Vec<ColumnInstance>) -> Self

Create a new set from existing columns.

pub fn len(&self) -> usize

Number of columns.

pub fn is_empty(&self) -> bool

Whether the set is empty.

Trait Implementations

impl Clone for ColumnInstanceSet

fn clone(&self) -> ColumnInstanceSet

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ColumnInstanceSet

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for ColumnInstanceSet

fn default() -> Self

Returns the “default value” for a type.