Question

我正在尝试编写一个从数组中返回最小数字的函数：

功能定义：

pub fn min(input_array: &[i32]) -> &i32 {
    let x = input_array.iter().min().unwrap();
    x
}

测试：

fn test_min() {
    let input_array = [1, 2, 3, 4];
    assert_eq!(1, functional::min(&input_array));
}

但是当我运行它时，我收到错误：

    <std macros>:5:8: 5:33 error: the trait `core::cmp::PartialEq<&i32>` is not implemented for the type `_` [E0277]
<std macros>:5 if ! ( * left_val == * right_val ) {
                      ^~~~~~~~~~~~~~~~~~~~~~~~~
src/functional.rs:104:5: 104:50 note: in this expansion of assert_eq! (defined in <std macros>)
<std macros>:5:8: 5:33 help: run `rustc --explain E0277` to see a detailed explanation
error: aborting due to previous error
Could not compile `gettingrusty`.

Answer 1

您的min没问题（假设您要返回&i32），错误在assert。这是正确的：

assert_eq!(&1, min(&input_array));

我的min函数有什么问题？

1 个答案: