Struct contrail::TrailBuilder

pub struct TrailBuilder { /* fields omitted */ }

A builder to create a Trail.

Examples

use contrail::{BacktrackableValue, TrailBuilder};

let mut builder = TrailBuilder::new();
let value = BacktrackableValue::new(&mut builder, 5);
let trail = builder.finish();

assert_eq!(value.get(&trail), 5);

Methods

impl TrailBuilder

pub fn new() -> Self

Creates a new empty TrailBuilder.

Examples

use contrail::TrailBuilder;

let mut builder = TrailBuilder::new();

pub fn finish(self) -> Trail

Consumes the TrailBuilder to create a new Trail.

Once this method is called, any Value and Array that were created using the TrailBuilder are usable with the resulting Trail.

Examples

use contrail::{NonBacktrackableArray, NonBacktrackableValue, TrailBuilder};

let mut builder = TrailBuilder::new();
let value = NonBacktrackableValue::new(&mut builder, -123);
let array = NonBacktrackableArray::new(&mut builder, vec![1, 3, 5, 7]);
let trail = builder.finish();

assert_eq!(value.get(&trail), -123);
assert_eq!(array.get(&trail, 2), 5);

Trait Implementations

impl Default for TrailBuilder

fn default() -> TrailBuilder

Returns the "default value" for a type.

impl Debug for TrailBuilder

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

Formats the value using the given formatter.