为什么迭代器不可复制? [英] Why are iterators not copyable?

问题描述

许多迭代器实现了Clone trait，但没有一个实现Copy 特质.至少对于像 std:slice::Iter，克隆 实现 无论如何看起来像一个 memcpy，那么为什么 Copy 也没有实现?

Many iterators implement the Clone trait, but none of them implement the Copy trait. At least for simple iterators like std:slice::Iter, the Clone implementation looks like a memcpy anyway, so why isn't Copy also implemented?

推荐答案

来自 PR #20790:

此 PR 还使迭代器不可隐式复制，因为这是库中细微错误的来源.您仍然可以使用 clone() 来显式复制迭代器.

This PR also makes iterator non-implicitly copyable, as this was source of subtle bugs in the libraries. You can still use clone() to explictly copy the iterator.

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