是否可以遍历元组? [英] Is it possible to iterate over a tuple?

问题描述

我想使用循环遍历一个元组，就像在 Python 中一样.Rust 有可能吗?

let tup1 = (1, '2', 3.0);对于我在 tup1.iter() {println!("{}", i);}

解决方案

元组的每个元素的类型可以不同，所以你不能遍历它们.元组甚至不能保证以与类型定义相同的顺序存储它们的数据，因此即使您自己为它们实现 Iterator，它们也不是有效迭代的好候选.p>

但是，数组完全等价于元组，所有元素的类型相同:

let tup = [1, 2, 3];对于我在 tup.iter() {println!("{}", i);}

另见:

• 如何迭代或映射元组?
• 为什么2元组Functor实例只对第二个元素应用函数?

I want to iterate over a tuple using a loop, like in Python. Is it possible in Rust?

let tup1 = (1, '2', 3.0);
for i in tup1.iter() {
    println!("{}", i);
}          

解决方案

The type of each element of a tuple can be different, so you can't iterate over them. Tuples are not even guaranteed to store their data in the same order as the type definition, so they wouldn't be good candidates for efficient iteration, even if you were to implement Iterator for them yourself.

However, an array is exactly equivalent to a tuple, with all elements of the same type:

let tup = [1, 2, 3];
for i in tup.iter() {
    println!("{}", i);
}

See also:

• How to iterate or map over tuples?
• Why does the 2-tuple Functor instance only apply the function to the second element?

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