Enumerated attributes with same name

Development C++
1

Dear all,

a simple question on enumerated attributes.
Since it is not possible to add new states other than the predefined ones (14 states) (i.e. see this post)
I would like to use enum attributes to define a state parameter with “unconventional” name (unfortunately I must adopt such names without re-mapping to the TANGO predefined states).

My question is: is it possible to have two or more enum attributes within a device server having the same labels? For example:

stateParam1 {OK,DEGRADED,OFFLINE}
stateParam2 {OK,DEGRADED}

The compiler complains a label redeclaration.
Do you have suggestions?

Cheers,

Simone

2

Hi Simone,

Because you are talking about compiler pb, I assume your Tango class is C++.
If you use the C++ 11 way of enum declaration, you can have the same label several times.


enum class _FirstEnum
{
	FIRST = 0,
	SECOND
};
typedef _FirstEnum FirstEnum;

enum class _SecondEnum
{
	FIRST = 0,
	SECOND
};
typedef _SecondEnum SecondEnum;

Then use enum label like FirstEnum::FIRST or SecondEnum::FIRST

Hoping this help

Emmanuel

3

Dear Emmanuel,

thanks a lot. It works. Pogo regenerates that piece of code every time, but the rest is fine.

Cheers,

Simone

4

Dear Manu,
after long time, I forgot to add to the previous question that, as suggested in the User Guide examples (pag. 163), I needed to add a “: short” in your enum class definition:


enum class _FirstEnum : short
{
	FIRST = 0,
	SECOND
};
typedef _FirstEnum FirstEnum;

otherwise I get this error while reading the attribute:

Invalid enumeration type. Supported types are C++11 scoped enum with short as underlying data type or old enum

Thanks again,

Simone