Shulou(Shulou.com)06/01 Report--

This article introduces the knowledge of "how to avoid the use of exposed consortia on C++". In the operation of practical cases, many people will encounter such a dilemma. Then let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

C.181: avoid using "exposed" complexes

Reason (reason)

An exposed union is a union that does not contain flags indicating which (if any) member is valid, and the programmer must keep track of the data flow. The consortium of exposed states is one of the sources of errors.

Example, bad (negative example)

Union Value {

Int x

Double d

}

Value v

V.d = 987.654; / / v holds a double

So far so good, but we can easily misuse this consortium:

Cout

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