Enum FactoryFallback 

pub enum FactoryFallback {
    First,
    Last,
    NoFallback,
}

当找不到指定 ID 的工厂时的处理策略。

Variants

First

如果找不到指定的工厂，则使用集合中的第一个工厂。

Last

如果找不到指定的工厂，则使用集合中的最后一个工厂。

NoFallback

ID 为空时不回退，直接返回错误。

Trait Implementations

impl Clone for FactoryFallback

fn clone(&self) -> FactoryFallback

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for FactoryFallback

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

Formats the value using the given formatter.

impl PartialEq for FactoryFallback

fn eq(&self, other: &FactoryFallback) -> 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 Copy for FactoryFallback

impl Eq for FactoryFallback

impl StructuralPartialEq for FactoryFallback