How to pass an enum to a function

[Angus]

Hello

I have an enum in a class like this:

enum MessageType
{
GET, //get message (get SAF sequence no.)
RESET, //reset sequence no.
UNKNOWN //unrecognised message
};

In the private section.

And a function like this:

CreateMessage(enum MessageType eType);

But when using the function how do I call it?

eg tried
CreateMessage(GET) and CreateMessage(MessageType.GET) and got error
C2228: left of '.GET' must have class/struct/union type

How do I pass enum to the function?

 

[Nick Keighley]

I have an enum in a class like this:

enum MessageType
{
GET, //get message (get SAF sequence no.)
RESET, //reset sequence no.
UNKNOWN //unrecognised message
};

In the private section.

the what?

And a function like this:

CreateMessage(enum MessageType eType);

in C++ you can omit the "enum"

But when using the function how do I call it?

eg tried
CreateMessage(GET) and CreateMessage(MessageType.GET) and got error
C2228: left of '.GET' must have class/struct/union type

How do I pass enum to the function?

you should post a complete compilable example. This compiles:-

enum MessageType
{
GET,
RESET,
UNKNOWN
};

void CreateMessage (MessageType eType)
{
}

int main ()
{
CreateMessage (GET);
return 0;
}

 

[Ian Collins]

Hello

I have an enum in a class like this:

enum MessageType
{
GET, //get message (get SAF sequence no.)
RESET, //reset sequence no.
UNKNOWN //unrecognised message
};

In the private section.

And a function like this:

CreateMessage(enum MessageType eType);

drop the "enum".

But when using the function how do I call it?

eg tried
CreateMessage(GET) and CreateMessage(MessageType.GET) and got error
C2228: left of '.GET' must have class/struct/union type

How do I pass enum to the function?

You are not passing the enum, but a value from that enum. To do this
with an enum that is nested in a class, the enum must be public.

 

[jalqadir]

Get rid of the enum keyword from the function declaration and
implementation, that'll do the trick.

 

[=?ISO-8859-1?Q?Erik_Wikstr=F6m?=]

Hello

I have an enum in a class like this:

enum MessageType
{
GET, //get message (get SAF sequence no.)
RESET, //reset sequence no.
UNKNOWN //unrecognised message
};

In the private section.

And a function like this:

CreateMessage(enum MessageType eType);

But when using the function how do I call it?

eg tried
CreateMessage(GET) and CreateMessage(MessageType.GET) and got error
C2228: left of '.GET' must have class/struct/union type

How do I pass enum to the function?

First of, as Ian Collins pointed out, you must declare the enum public,
second you have to tell the compiler that you want the enum declared in
the class by prefixing with the class name (a class acts as (or is?) a
namespace):

class Message
{
public:
enum MessageType { Get, Reset, Unknown };
};

Message CreateMessage(Message::MessageType type);
^^^^^^^^^
int main()
{
Message msg = CreateMessage(Message::Get);
^^^^^^^^^
}

 

[nallayan77]

First of, as Ian Collins pointed out, you must declare the enum public,
second you have to tell the compiler that you want the enum declared in
the class by prefixing with the class name (a class acts as (or is?) a
namespace):

class Message
{
public:
enum MessageType { Get, Reset, Unknown };

};

Message CreateMessage(Message::MessageType type);
^^^^^^^^^
int main()
{
Message msg = CreateMessage(Message::Get);
^^^^^^^^^

}

Hi,

enum MSG_TYPE { Get, Reset, Unknown }; //you can have this outside the
class

Then you can have like this.
class Message
{
private:
MSG_TYPE MessageType;
....
......
};

Thanks