switch statement with const GUID

Switch only works with ordinal types, anything that can be considered as a number basically. Are you saying switch (SomeConstant)? I don''t think switch allows a constant, since it won''t ever change. You could cast it to a long unsigned int though, and it would probably work. You''d just have to cast all of the cases to long unsigned ints as well.

Just a guess, let me know if it works!

Good luck,
Chris

A GUID is a struct which is about 16 bytes long, so it''s not going to work in a switch. An if-else ladder should be fine though.

Stay Casual,

Ken
Drunken Hyena

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Original post by Supernat02
Switch only works with ordinal types, anything that can be considered as a number basically.

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Nope. You can''t use a float as your case label. case labels must be integral, thus GUID is an invalid type.

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Are you saying switch (SomeConstant)? I don''t think switch allows a constant, since it won''t ever change.

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switch expects constant values, whether defined as const or resolved at compile time (ie, macros). You can''t use a runtime-resolved variable value as your case label either (most implementatinos of switch construct a jump table from the case labels; that is impossible if they aren''t known at compile time).

Sorry, like I said, just a guess! Thanks for the corrections.

Oluseyi, you said "switch expects constant values, whether defined as const or resolved at compile time (ie, macros)". You mean the case part of it right?

I know you can put a constant in the switch statement and it compiles (doesn''t get you much though), but you can also put a runtime-resolved variable in the switch statement as well. The cases must always be constant...that makes sense. Just trying to get it all straight in my head.

Thanks,
Chris