A type playing the role of copy-constructible-type in the CopyConstructible concept.

在可复制构造概念中担任可复制构造类型角色的类型。

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If neither the second nor third option above is a valid option, t must be copy constructible and assignable.

如果上面第二和第三个选项都是有效选项，T必须是可构造和可赋值的副本。

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Copy constructible types must be able to be constructed from another member of the type.

可复制构造的类型必须能够从该类型的另一个对像进行构造。

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