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Defining class constants

 
Barry Brashear
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Can someone tell me how a class constant should be defined? Is it okay to
have a constant defined in the same file that it is used? Or should all
constants be in a class by themselves?

Thanks.
 
Stan James
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As usual, it depends on the situation. Some constants are values that you are allowed to pass into a particular method. Then it makes sense for the class that has the method to also have the constants. Some constants are used all over the system. Then it makes sense to make them more global in their own class.

It's a neat goal to have only one reason to change a class. That steers you away from a single class with all the constants in the system because it would have many reasons to change.
 
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