mirror of https://github.com/rust-lang/rust.git
48 lines
1004 B
Rust
48 lines
1004 B
Rust
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#[doc(alias = "加法")]
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pub fn add(left: usize, right: usize) -> usize {
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left + right
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}
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pub fn 中文名称的加法API(left: usize, right: usize) -> usize {
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left + right
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}
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#[macro_export]
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macro_rules! 中文名称的加法宏 {
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($left:expr, $right:expr) => {
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($left) + ($right)
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};
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}
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#[doc(alias = "加法")]
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#[macro_export]
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macro_rules! add {
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($left:expr, $right:expr) => {
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($left) + ($right)
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};
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}
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/// Add
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pub trait 加法<类型> {
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type 结果;
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fn 加上(self, 被加数: 类型) -> Self::结果;
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}
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/// IntoIterator
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pub trait 可迭代 {
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type 项;
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type 转为迭代器: Iterator<Item = Self::项>;
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fn 迭代(self) -> Self::转为迭代器;
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}
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pub type 可选<类型> = Option<类型>;
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/// "sum"
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pub fn 总计<集合, 个体>(容器: 集合) -> 可选<集合::项>
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where
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集合: 可迭代<项 = 个体>,
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个体: 加法<个体, 结果 = 个体>,
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{
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容器.迭代().reduce(|累计值, 当前值| 累计值.加上(当前值))
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}
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