Struct CowExpression

pub struct CowExpression { /* private fields */ }

写时复制表达式包装器

Implementations

impl CowExpression

pub fn new(expr: Expression) -> Self

创建新的写时复制表达式

pub fn from_shared(shared: SharedExpression) -> Self

从共享表达式创建

pub fn as_ref(&self) -> &Expression

获取表达式的引用

pub fn as_mut(&mut self) -> &mut Expression

获取可变引用（触发写时复制）

pub fn is_modified(&self) -> bool

检查是否已修改

pub fn ref_count(&self) -> usize

获取引用计数

pub fn into_owned(self) -> Expression

转换为拥有的表达式

pub fn into_shared(self) -> SharedExpression

转换为共享表达式

Trait Implementations

impl Clone for CowExpression

fn clone(&self) -> CowExpression

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CowExpression

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

Formats the value using the given formatter.

impl PartialEq for CowExpression

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.