nested classes and structures are only useful for hiding and access to the outer
classes private scoped members. So, you are probably best NOT to nest the
Class Foo: Implements IFace
That is, keep them all separate. I have a feeling you are use to structs being
like UDT's in Vb6, which they are in many ways, but they are also more like a
class in many ways too. Most importantly, they do not have to be declared
inside a class, but can be declared just like any class can be.
"Bob Clegg" <bclegg (AT) clear (DOT) net.nz> wrote
Hi Bill, |
The class is right.
The interface declaration is more like
Function UpdateBar(myBar as Bar) as boolean
The problem is that it seems to me that Bar should no longer live in Foo,
now that Foo is hiding behind an interface. ( The reason for this is that
Foo is a data class using SQL Server objects and there is soon going to be
an FooBrother that uses Oracle data objects. Only one of the two will be
compiled depending on the installation.) So where to place Bar?
As a number of calling classes want to use Bar it would seem ideal to me to
place it in a module.
But if I do that then the above declaration fails with can't expose a
I have a working solution by getting Bar to bunk down in one of the calling
classes, but it seems tacky.
"Bill McCarthy <no spam>" <bill_mcc @ iprimus.com.au> wrote in message
news:uNBBaCyFEHA.3576 (AT) tk2msftngp13 (DOT) phx.gbl...
Do you mean you have :
Public Structure Bar
and you want to define an Interface, such as :
Function GetBar() as Foo.Bar
If so, Foo must be Public.
Alternatively, don't have Bar nested.
"Bob Clegg" <bclegg (AT) clear (DOT) net.nz> wrote in message
news:OoEhpzvFEHA.712 (AT) tk2msftngp13 (DOT) phx.gbl...
I have a Data Class that declares a Public struct.
It accepts instances of this struct in some of its function calls.
I now want to put an interface between this class and the calling
I would like to move the struct out to the module that is housing the
But when I do this I get a scoping problem.
The interface declaration of any function that is passing one of these
structs complains that it can't expose a friend type publicly.
I have tried putting the struct into the interface and I have also tried
public declaration in the module proper and another module.
The only thing that seems to work but doesn't sit comfortably with me is
declare it public in one of the calling classes.