Obj-C Classes do not form a namespace like they do in C++.
Both enum Error are in the global scope. That is the source of your
problem...
Best regards,
B.J Buchalter
On Mar 20, 2008, at 11:31 PM, K. Darcy Otto wrote:
I've been trying to add some human-readable error codes to my
classes using enum, but have been running into some difficulties
when I add a different enum of the same name to a different class.
Here is what I have so far in my DeductionLine class (and I think it
will suffice just to show the interface:
@interface DeductionLine : NSObject {
Dependency *dependency;
LineNumber *lineNumber;
Formula *formula;
Justification *justification;
BOOL wfdl; // well-formed deduction line
enum Error
{
noError = 0, // everything ok
dependencyExistError = 1, // dependency does not exist
lineNumberExistError = 2, // line number does not exist
formulaFormError = 3, // formula is not a wff
justificationFormError = 4, // justification is not a wfj
justificationReferenceError = 5, // justification references lines
greater or equal to lineNumber
justificationMatchError = 6 // justification is $I, but main
connective of formula does not correspond to $
} errorCode;
}
Now, I know the =0, =1 is redundant, but I want it there for ease of
reading, just in case the programmer wants to output errorCode to a
log (which will result in an integer, which can then be looked up in
the interface). This works fine in this class: I can write:
"errorCode = noError;" or whatever, and everything is happy. But
when I try to do something similar in the DeductionLineSequent
class, there is no end to compiler complaining:
@interface DeductionLineSequent : NSObject {
NSArray *sequent;
NSArray *additionalFormulae;
BOOL valid;
enum Error
{
noError = 0, // everything ok
dependencyError = 1, // dependency sequent invalid
lineNumberError = 2, // line number sequent invalid
formulaError = 3, // formula sequent invalid
} errorCode;
}
I get "nested redefinition of 'enum Error'", (ii) "redeclaration of
'enum Error'" and (iii) redeclaration of enumerator 'noError'. So,
I have two questions: is it possible to get each enum local to the
class in which it is defined (so it does not seem to be "nested")?
Second, is there a better strategy for defining human-readable error
codes? Thanks.
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B.J. Buchalter
Metric Halo
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