Hi
I want to convert a safe enum to string and conversely. For example I have a enum as following:
struct ESocketStatus_def {
enum type {
ESocketStatus_Unknown,
ESocketStatus_Listening,
ESocketStatus_Connected,
ESocketStatus_Connecting,
ESocketStatus_Disconnected
};
static type get_default(){ return ESocketStatus_Unknown;}
};
typedef dds::core::safe_enum<ESocketStatus_def> ESocketStatus;now, we want to convert the ESocketStatus_Unknown to "ESocketStatus_Unknown" or conversely.
Is there a way for this work?
Thank you
Hi,
No the
dds::core::safe_enumclass template does not provide any ways to convert an enumeration to its string/readable value.I'm not sure why you're using that class...it's not really designed for use by the end user directly.
If you want to use an enumeration in a datatype that will be used by a DDS topic, then you need to define the enumeration in an IDL/XML file and then use rtiddsgen to generate the type definition in the programming language that you're using (for example C++11).
For code generated for the C++11 (aka Modern C++) programming language, the enumeration is defined with a "helper" override function that will take a value of the enumeration and print the string equivalent.
For example, if your IDL is:
enum myenum {
ESocketStatus_Unknown,
ESocketStatus_Listening,
ESocketStatus_Connected,
ESocketStatus_Connecting,
ESocketStatus_Disconnected
};
struct MyData {
myenum foo;
};
then in the .hpp file for the datatype, you should find this
enum class myenum {
ESocketStatus_Unknown,
ESocketStatus_Listening,
ESocketStatus_Connected,
ESocketStatus_Connecting,
ESocketStatus_Disconnected
};
NDDSUSERDllExport std::ostream& operator << (std::ostream& o,const myenum& sample);
and in the related .cxx implementation file, you would find this
std::ostream& operator << (std::ostream& o,const myenum& sample){
::rti::util::StreamFlagSaver flag_saver (o);
switch(sample){
case myenum::ESocketStatus_Unknown:
o << "myenum::ESocketStatus_Unknown" << " ";
break;
case myenum::ESocketStatus_Listening:
o << "myenum::ESocketStatus_Listening" << " ";
break;
case myenum::ESocketStatus_Connected:
o << "myenum::ESocketStatus_Connected" << " ";
break;
case myenum::ESocketStatus_Connecting:
o << "myenum::ESocketStatus_Connecting" << " ";
break;
case myenum::ESocketStatus_Disconnected:
o << "myenum::ESocketStatus_Disconnected" << " ";
break;
}
return o;
}
Hi
Thank you for response. That is correct, but there is exist another way, also.
Is there a way for converting the string to the enum into the rti?
If we have one Enum, this work is easy. but I have many enum in namespace.
For example we enter the "ESocketStatus_Connected" and getting the equivalent enum that is ESocketStatus_Connected. while i don't know that the corresponding enum.
Thank you
Sorry, no. The generated type support code does not offer that API.
I offer you that insert this functionality.
Because as the enum to string can be used, the vice versa is useful.
Thank you
Noted.