IDL enum issues - Same enumerator names, and a value specified [13812]

[webhoppery]

Example : Test.idl (Test.txt attached)

Errors with : UNKNOWN = 0,
Had to Edit : UNKNOWN , // = 0,

Same enumerator names - UNKNOWN

cmake ..
-- Building for: Visual Studio 17 2022
-- Selecting Windows SDK version 10.0.19041.0 to target Windows 10.0.19044.
-- The C compiler identification is MSVC 19.30.30706.0
cmake --build .
Test.cxx(44,46): error C2365: 'orov::msg::system::UNKNOWN': redefinition; previous definition was 'enumerator'

Test.h : Edit enum to enum class
Test.cxx(46,47): error C2065: 'UNKNOWN': undeclared identifier

Test.cxx : Prefix UNKNOWN with enum name ::
m_crc_result = orov::msg::system::EChecksumResult::UNKNOWN;
m_reset_cause = orov::msg::system::EMCUResetCause::UNKNOWN;

But other statements prefix with the enum name :
Test.txt

Could fastddsgen assume the enum is enum class and prefix UNKNOWN?

 m_crc_result = (orov::msg::system::EChecksumResult)enum_value;
m_reset_cause = (orov::msg::system::EMCUResetCause)enum_value;

[zip-link]

I use the gen program of version 2.0.0 and use @ value to specify the default value of enum, but the actual value is 0, 1, 2 and 3; Has this problem been solved.

enum Enumeration
{
@value(10) RED,
GREEN,
BLUE
};

[JLBuenoLopez]

Hi @webhoppery,

As @zip-link comment states, the proper way defined by the OMG IDL specification to set specific values into an Enumerator is using the builtin annotation @value. Consequently, instead of UNKNOWN = 0,, you should write @value(0) UNKNOWN,.

However, @zip-link is right and this builtin annotation is not yet supported in Fast DDS-Gen. I have just issued eProsima/Fast-DDS-docs#368 to clarify this point in the documentation. And I will leave this issue open until @value annotation is supported by Fast DDS-Gen.

[JLBuenoLopez]

Labeling this ticket as an enhancement as it is something not yet supported (though defined in the specification). Moving the ticket to the Ideas discussion forum where enhancements and feature requests are discussed.