何时应将“静态绑定”添加到特性定义中

Question

有人能为我解释一下'static的用法吗？我看到了这段代码，但我不明白它是如何使用的。

// When should 'static bound' be added to trait definitions
pub trait FinalitySyncPipeline: 'static + Clone + Debug + Send + Sync {
    /// Name of the finality proofs source.
    const SOURCE_NAME: &'static str;
    /// Name of the finality proofs target.
    const TARGET_NAME: &'static str;

    /// Headers we're syncing are identified by this hash.
    type Hash: Eq + Clone + Copy + Send + Sync + Debug;
    /// Headers we're syncing are identified by this number.
    type Number: relay_utils::BlockNumberBase;
    /// Type of header that we're syncing.
    type Header: SourceHeader<Self::Number>;
    /// Finality proof type.
    type FinalityProof: FinalityProof<Self::Number>;
}

Answer 1

作为一个特征绑定，它意味着类型不包含任何非静态引用。例如：接收者可以在他们想要的时间内保留类型，直到他们放弃它，它才会变得无效。

请参阅：静态-锈蚀的例子