复制和克隆有什么区别? [英] What is the difference between Copy and Clone?

问题描述

这个问题似乎暗示它只是一个实现细节(memcpy vs ???)，但我找不到任何关于差异的明确描述.

This issue seems to imply it's just an implementation detail (memcpy vs ???), but I can't find any explicit description of the differences.

推荐答案

Clone 专为任意重复而设计:T 类型的Clone 实现code> 可以执行创建新 T 所需的任意复杂操作.这是一个正常的 trait(除了在前奏中)，因此需要像普通 trait 一样使用，带有方法调用等.

Clone is designed for arbitrary duplications: a Clone implementation for a type T can do arbitrarily complicated operations required to create a new T. It is a normal trait (other than being in the prelude), and so requires being used like a normal trait, with method calls, etc.

Copy trait 表示可以通过 memcpy 安全复制的值:诸如重新分配和按值将参数传递给函数之类的东西总是 memcpys，所以对于 Copy 类型，编译器明白它不需要考虑那些 一个动作.

The Copy trait represents values that can be safely duplicated via memcpy: things like reassignments and passing an argument by-value to a function are always memcpys, and so for Copy types, the compiler understands that it doesn't need to consider those a move.

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