rust - pub(crate)函数声明语法是什么意思？什么时候使用？ [复制]

Question

This question already has an answer here:

How do I make an Rust item public within a crate, but private outside it?

(1个答案)


在11个月前关闭。




我是一个使用rust 的新手，我在开源 repository pub(crate) fn中遇到了这种函数声明

我以前从未见过这种语法，所以我想知道它的用途是什么？

最佳答案

它定义了可见性级别。可见性(隐私)级别在here中进行了说明:

Syntax Visibility : pub | pub ( crate ) | pub ( self ) | pub ( super ) | pub ( in SimplePath )

pub(in path) makes an item visible within the provided path. path must be a parent module of the item whose visibility is being declared.

pub(crate) makes an item visible within the current crate.

pub(super) makes an item visible to the parent module. This is equivalent to pub(in super).

pub(self) makes an item visible to the current module. This is equivalent to pub(in self).

因此， pub(crate) fn find_key<K, S>(keys: &Chunk<K, S>, key: &K) -> Option<usize>使 find_key函数在 crate 内(而不是在 crate 外)公开(可用)。

关于rust - pub(crate)函数声明语法是什么意思？什么时候使用？ [复制]，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/61542928/

上一篇：rust - 持有Vecs的结果的高效Rust收集器

下一篇：arrays - 从数组取消大小时，Rust如何确定切片的长度？

Answer 1

它定义了可见性级别。可见性(隐私)级别在here中进行了说明:

Syntax Visibility : pub | pub ( crate ) | pub ( self ) | pub ( super ) | pub ( in SimplePath )

pub(in path) makes an item visible within the provided path. path must be a parent module of the item whose visibility is being declared.

pub(crate) makes an item visible within the current crate.

pub(super) makes an item visible to the parent module. This is equivalent to pub(in super).

pub(self) makes an item visible to the current module. This is equivalent to pub(in self).

因此， pub(crate) fn find_key<K, S>(keys: &Chunk<K, S>, key: &K) -> Option<usize>使 find_key函数在 crate 内(而不是在 crate 外)公开(可用)。