Struct WriteGuard 

pub struct WriteGuard<'a, V> { /* private fields */ }

Guardian of mutable value reference, holding HashMap read lock and value write lock 可变值引用的守护者，持有HashMap读锁和值的写锁

This allows other threads to still read other values, but cannot modify this value 这样其他线程仍可读取其他值，但不能修改此值

Trait Implementations

impl<'a, V> AsMut<V> for WriteGuard<'a, V>

fn as_mut(&mut self) -> &mut V

Converts this type into a mutable reference of the (usually inferred) input type.

impl<'a, V> AsRef<V> for WriteGuard<'a, V>

fn as_ref(&self) -> &V

Converts this type into a shared reference of the (usually inferred) input type.

impl<'a, V> Debug for WriteGuard<'a, V>

where V: Debug,

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

Formats the value using the given formatter.

impl<'a, V> Deref for WriteGuard<'a, V>

type Target = V

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl<'a, V> DerefMut for WriteGuard<'a, V>

fn deref_mut(&mut self) -> &mut Self::Target

Mutably dereferences the value.

impl<'a, V> Display for WriteGuard<'a, V>

where V: Display,

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

Formats the value using the given formatter.

impl<'a, V> PartialEq for WriteGuard<'a, V>

where V: PartialEq,

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.

impl<'a, V> Eq for WriteGuard<'a, V>

where V: Eq,