I have enum inside public part of some class A. I want to use this enum in class B. Is it a way to make it accessible without specifying *A::enum_value*? So I can use just *enum_value*.
using A::enumname;
inside class B doesn't compile.
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1Do you can simply remove the enum from class A?Leo Chapiro– Leo Chapiro2013-04-12 14:12:14 +00:00Commented Apr 12, 2013 at 14:12
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2 Answers
If you only need certain values, you can do:
struct B {
static const A::enumname
enum_value1 = A::enum_value1,
enum_value2 = A::enum_value2; // etc.
};
If you can modify A, you can extract the enum into a base class that can be used by both A and B:
struct AEnum {
enum enumname { enum_value1, enum_value2 };
};
struct A : AEnum {
};
struct B : BEnum {
};
Comments
There's no good way to directly import all the enum values from one place to another. In this case I'd suggest wrapping A's enum into a nested class, and then typedeffing that into B.
For example:
class A
{
public:
struct UsefulEnumName
{
enum Type { BAR };
};
};
class B
{
typedef A::UsefulEnumName UsefulEnumName;
UsefulEnumName::Type foo() const { return UsefulEnumName::BAR; }
};
