Enumerators Cast
I have en error when try to cast own enumerator to address book values:
typedef enum {
kACTextFirstName = kABPersonFirstNameProperty, // error: expression is not an integer constant expression
kACTextLastName = (int)kABPersonLastNameProperty, // error: expression is not an integer constant expression
} ACFieldType;
How to solve the problem?
Thank you.
I need to init my enum using A开发者_高级运维BAddressBook's framework const values such as kABPersonLastNameProperty or kABPersonFirstNameProperty.
In C (unlike in C++), an object declared const
, even if it's initialized with a constant expression, cannot be used as a constant.
You didn't bother to show us the declaration of kABPersonFirstNameProperty
, but I"m guessing it's declared something like:
const int kABPersonFirstNameProperty = 42;
If you need to use the name kABPersonFirstNameProperty
as a constant expression, you can either declare it as a macro:
#define kABPersonFirstNameProperty 42
or as an enumeration constant:
enum { kABPersonFirstNameProperty = 42 };
Note that the enum hack only lets you declare constants of type int
.
Likewise for kABPersonLastNameProperty
.
(And why do you cast one of them to int
, but not the other?)
If that doesn't answer your question, it's because you didn't give us enough information.
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