Private vs. protect

[wriedmann]

Hello,
when moving C# code to X# I have encountered something I don't understand.
AFAIK the "private" statement in C# is to translate to "protected" in X# because "private" has another meaning in xBase.
But the following code does not compiles in X# (Core):

Code: Select all

static class MyClass
static protected MyVar as string
static protected method MyMethod() as void
	return
end class

as the compiler says

Code: Select all

warning XS1057: 'MyClass.MyVar': static classes cannot contain protected members
warning XS1057: 'MyClass.MyMethod()': static classes cannot contain protected members

But when I change the code to

Code: Select all

static class MyClass
static private MyVar as string
static private method MyMethod() as void
	return
end class

it compiles....
Wolfgang

[lumberjack]

Hi Wolfgang,

when moving C# code to X# I have encountered something I don't understand.
AFAIK the "private" statement in C# is to translate to "protected" in X# because "private" has another meaning in xBase.
But the following code does not compiles in X# (Core):

Code: Select all

static class MyClass
static protected MyVar as string
static protected method MyMethod() as void
	return
end class

as the compiler says

Code: Select all

warning XS1057: 'MyClass.MyVar': static classes cannot contain protected members
warning XS1057: 'MyClass.MyMethod()': static classes cannot contain protected members

But when I change the code to

Code: Select all

static class MyClass
static private MyVar as string
static private method MyMethod() as void
	return
end class

it compiles....

From the help file:

Code: Select all

The PRIVATE statement is NOT available in the Core and Vulcan dialects and will only be enabled if the -memvar commandline option is specified

I think there was changes to support VFP and other languages. Is the c# private not hidden in X#?

[orangesocks]

Hi,
I think that you cannot use the protected keyword with static classes because they cannot be inherited like normal classes.
See here https://stackoverflow.com/questions/774 ... ic-classes
In my understanding the protected keyword is used to limit the visibility of a variable/method only to derived classes.
HTH
Regards Giuseppe

[robert]

Wolfgang,

Hello,
when moving C# code to X# I have encountered something I don't understand.
AFAIK the "private" statement in C# is to translate to "protected" in X# because "private" has another meaning in xBase.

The X# equivalent of PRIVATE is HIDDEN but we also allow PRIVATE. The remark about PRIVATE in the documentation relates to the private STATEMENT and NOT the private visibility MODIFIER for instance variables/fields and methods.

PROTECTED means that a method or field can also be seen by subclasses, but you can't inherit from STATIC classes so that is meaningless for a static class.

Robert

[wriedmann]

Hi Robert,

thank you very much for this clarification.
I will change my code accordingly (replace "private" by "hidden").
Wolfgang

[Chris]

Wolfgang, PRIVATE should work just fine, too.

[wriedmann]

Hi Chris,

yes, it compiled too, but for better documentation I prefer to use "hidden".

Wolfgang

[FFF]

+1