Question

I have used the stack created at http://www.codeproject.com/Tips/226892/How-to-implement-Stack-in-Object-C, which will accept any object, but I actually want to use it to store an enum type.

When I was trying to assign an enum to it, the compiler said that enum cannot be converted into id. What should I do?

Answer 1

If your stack stores NSObjects you can simply cast the enum values to an integer (which they are) and box them in an NSNumber:

Adding to the stack:

NSNumber *boxedValue = [NSNumber numberWithInteger:eMyEnumValue];
[stack push:boxedValue];

Retrieving from the stack:

NSNumber *boxedValue = [stack pop];
MyEnum enumValue = (MyEnum) [boxedValue integerValue];