c ++定义不同命名空间的枚举

Question

I have the following header file:

namespace First
{
    namespace Second
    {
        class Limit
        {
            public:
                enum Status
                {
                    GOOD,
                    BAD
                };
        }
    }
}

Since it's proprietary I have changed the names, and only left the relevant info.

In my own class I have...

First::Second::Limit::Status limit_status = First::Second::Limit::Status::OK;

But I get an error: error: class First::Second::Limit::Status is not a class or namespace

I am able to declare a variable of that enum, but not set it to any of the values. How do I fix this?

Answer 1

First::Second::Limit::Status limit_status = First::Second::Limit::GOOD;

You don't need the Status bit. Think of it as defining several const int s inside Limit , you wouldn't say Limit::int::GOOD .

Answer 2

If you have C++11, use enum class :

namespace First
{
    namespace Second
    {
        class Limit
        {
            public:
                enum class Status
                {
                    GOOD,
                    BAD
                };
        }
    }
}

Now you can use Status as a scope. If not, you'll have to not include the Status:: part.