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How to use variant instead of union, many novices are not very clear about this, in order to help you solve this problem, the following editor will explain for you in detail, people with this need can come to learn, I hope you can gain something.

Union is similar to struct in that it can contain multiple data members, but only one member is allowed to be valid at the same time, so it is often used as a space-saving class. Consider the following code:

Union Uv {int i; double df;}; Uv U1; U1.I = 100; std::cout

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