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Tip of the Day
Home » Tip Bank » C++
Language: C++
Expertise: All
Oct 10, 2000

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Assigning an Integer Value to an Enumeration

C++ doesn't allow you to assign integer value to an enumeration directly:

 
enum Direction (Up, Down};
Direction dir;
Dir=0; // error, can't assign int to enum type

However, you can use static_cast to explicitly cast an int value to an enumeration.

 
dir=static_cast < Direction > (0); // OK< dir equals 'Up'

If the int value is beyond the valid ranges of the enumeration, the results are undefined. Therefore, use this technique with caution:

 
dir=static_cast < Direction > (5); // undefined behavior

Danny Kalev
 
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