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The clone trade is for types that can make copies of themselves.

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For this to work, it needs to construct an independent copy using the self keyword and then return

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it.

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A clones definition is as what's followed, so we have our trait clone, which also implements the sized

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trait, and then we have a couple of methods associated with it.

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Cloning a value typically means allocating copies of anything it owns, which can make clones very time

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and memory expensive.

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Just imagine taking a vector of strings and cloning.

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Every string inside the vector would also be cloned.

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So as you can expect, a clone can indeed be very expensive.

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The types like AI 32 and Boolean implement clone, but other things such as mutex, which we will talk

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about in the concurrency section, do not.