Struct Assignment 

pub struct Assignment { /* private fields */ }

变量赋值：一组 变量名 → 取值。

Implementations

impl Assignment

pub fn new() -> Self

空赋值。

pub fn set(&mut self, name: impl Into<String>, value: Ternary) -> &mut Self

绑定一个变量。

pub fn get(&self, name: &str) -> Option<Ternary>

查询变量的取值；未绑定时返回 None。

pub fn variables(&self) -> Vec<String>

已绑定的变量名。

pub fn len(&self) -> usize

赋值条目数。

pub fn is_empty(&self) -> bool

是否为空。

Trait Implementations

impl Clone for Assignment

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Assignment

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

Formats the value using the given formatter.

impl Default for Assignment

fn default() -> Self

Returns the “default value” for a type.

impl Eq for Assignment

impl PartialEq for Assignment

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Assignment