Struct LazyExpression

pub struct LazyExpression { /* private fields */ }

惰性表达式

Implementations

impl LazyExpression

pub fn new(id: usize, expr: Expression) -> Self

创建新的惰性表达式

pub fn with_compute_fn<F>(id: usize, expr: Expression, compute_fn: F) -> Self

where F: Fn(&Expression, &dyn ComputeEngine) -> Result<Expression, ComputeError> + Send + Sync + 'static,

创建带计算函数的惰性表达式

pub fn add_dependency(&mut self, dep: Arc<LazyExpression>)

添加依赖

pub fn set_priority(&mut self, priority: i32)

设置优先级

pub fn id(&self) -> usize

获取表达式 ID

pub fn original(&self) -> &Expression

获取原始表达式

pub fn state(&self) -> LazyState

获取当前状态

pub fn dependencies(&self) -> &[Arc<LazyExpression>]

获取依赖列表

pub fn priority(&self) -> i32

获取优先级

pub fn is_computed(&self) -> bool

检查是否已计算完成

pub fn is_failed(&self) -> bool

检查是否计算失败

pub fn is_computing(&self) -> bool

检查是否正在计算

pub fn can_compute(&self) -> bool

检查是否可以开始计算（所有依赖都已完成）

pub fn get_result(&self) -> Option<Expression>

获取计算结果（如果已计算完成）

pub fn get_error(&self) -> Option<ComputeError>

获取计算错误（如果计算失败）

pub fn force_compute( &self, engine: &dyn ComputeEngine, ) -> Result<Expression, ComputeError>

强制计算表达式

pub fn reset(&self)

重置计算状态

Trait Implementations

impl Clone for LazyExpression

fn clone(&self) -> LazyExpression

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for LazyExpression

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

Formats the value using the given formatter.