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Rust 编程视频教程(进阶)——028_2 返回闭包


视频地址

头条地址:https://www.ixigua.com/i6775861706447913485
B站地址:https://www.bilibili.com/video/av81202308/

源码地址

github地址:https://github.com/anonymousGiga/learn_rust

讲解内容

返回闭包
错误例子:

fn returns_closure() -> Fn(i32) -> i32 { |x| x + 1 }

正确例子:

fn returns_closure() -> Box<dyn Fn(i32) -> i32> {
Box::new(|x| x + 1)
}

fn main() {
let c = returns_closure();
println!("r = {}", c(1));
//等价于println!("r = {}", (*c)(1)); //解引用多态
println!("Hello, world!");
}


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