Struct EnvironmentSnapshot 

pub struct EnvironmentSnapshot {
    pub names: Vec<Name>,
}

A snapshot of an Environment at a point in time.

Snapshots are useful for implementing undo/redo in interactive mode.

Fields

names: Vec<Name>

Names present at snapshot time, in insertion order.

Implementations

impl EnvironmentSnapshot

pub fn from_env(env: &Environment) -> Self

Create a snapshot from an environment.

pub fn len(&self) -> usize

Number of constants in the snapshot.

pub fn is_empty(&self) -> bool

Check if empty.

pub fn diff<'a>(&self, new: &'a EnvironmentSnapshot) -> Vec<&'a Name>

Return the names added in new that were not in self.

Trait Implementations

impl Clone for EnvironmentSnapshot

fn clone(&self) -> EnvironmentSnapshot

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for EnvironmentSnapshot

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

Formats the value using the given formatter.