20 lines
677 B
Markdown
20 lines
677 B
Markdown
# Story About Union
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（Union）is a space saving special class.A union can have multiple data members.However, only one data member can have a value at any time. When a member is assigned a value, other members become undefined.
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- The default access control character is public
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- It can contain constructors and destructors
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- Cannot contain a member of a reference type
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- Cannot inherit from other classes, cannot be a base class
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- Cannot contain virtual functions
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- Anonymous union can directly access union members in the scope of definition
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- Anonymous union cannot contain protected or private members
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- Global anonymous union must be static
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