Consider the following C++ enumerations:
enum Identity
{
UNKNOWN = 1,
CHECKED = 2,
UNCHECKED = 3
};
enum Status
{
UNKNOWN = 0,
PENDING = 1,
APPROVED = 2,
UNAPPROVED = 3
};
The Compiler conflicted the both UNKNOWN
items and threw this error:
error: redeclaration of 'UNKNOWN'
I am able to solve this error changing one of the UNKNOWN
to UNKNOWN_a
, but I would like to do not change the names.
How can I solve this conflict without changing the enum
items name?
You can use scoped enumerations for this. This requires C++11 or higher support.
enum class Identity
{
UNKNOWN = 1,
CHECKED = 2,
UNCHECKED =3
};
enum class Status
{
UNKNOWN = 0,
PENDING = 1,
APPROVED = 2,
UNAPPROVED =3
};
int main ()
{
Identity::UNKNOWN;
Status::UNKNOW;
}
Live Example
Use scoped enum
s (C++ 11) - enum class
es. They will not pollute the outer scope with duplicate names.
But, you'll need to access the enumerated values with a scope resolution operator - Identity::UNKNOWN
, which is not a bad thing.
If using C++11 is not feasible(It really should by now, I mean, it's already 2015), consider using namespaces:
namespace Identity {
enum {
UNKNOWN = 1,
CHECKED = 2,
UNCHECKED =3
};
}
namespace Status {
enum {
UNKNOWN = 0,
PENDING = 1,
APPROVED = 2,
UNAPPROVED =3
};
}
But, really, enum class
is much better.
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