Struct Singleton

pub struct Singleton<T>(/* private fields */)
where
    T: Tuple;

Represents a single tuple of type T.

Example:

use codd::{Database, expression::Singleton};

let mut db = Database::new();
let hello = Singleton::new("Hello".to_string());

assert_eq!(vec!["Hello".to_string()], db.evaluate(&hello).unwrap().into_tuples());

Implementations

impl<T: Tuple> Singleton<T>

pub fn new(tuple: T) -> Self

Create a new instance of Singleton with tuple as the inner value.

pub fn tuple(&self) -> &T

Returns a reference to the inner value of the receiver.

pub fn into_tuple(self) -> T

Consumes the receiver and returns its inner value.

Trait Implementations

impl<T> Clone for Singleton<T>

where T: Tuple + Clone,

fn clone(&self) -> Singleton<T>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<T> Debug for Singleton<T>

where T: Tuple + Debug,

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

Formats the value using the given formatter.

impl<T> Expression<T> for Singleton<T>

where T: Tuple,

fn visit<V>(&self, visitor: &mut V)

where V: Visitor,

Visits this expression by a Visitor.

fn builder(&self) -> Builder<T, Self>

Returns an expression builder over this expression.

impl<T: Tuple> From<Singleton<T>> for Mono<T>

fn from(singleton: Singleton<T>) -> Self

Converts to this type from the input type.