Single instance of a class to be available to all instances or all other classes

I am developing some class modules to run a specialised simulation and need a simulation clock to be available to the objects in the simulation.

I have a clock class that returns the time as a property, see below.

How can I make the one clock available to all other objects?  

Private piTime As Integer

Private Sub Class_Initialize()

    piTime = 0

End Sub

Public Property Get Time() As Integer

    Time = piTime

End Property

Public Sub Tick()

    piTime = piTime + 1

End Sub

Public Sub Clear()

    piTime = 0

End Sub

Open in new window

LVL 1
sjgreyAsked:
Who is Participating?
 
Rory ArchibaldConnect With a Mentor Commented:
VBA doesn't give you a constructor you can use, so you'll need the property though it needs to be a Property Set rather than Let as you are passing an object.
0
 
Rory ArchibaldCommented:
You would need all your other classes to have a property (say 'Clock') to which you assign the clock instance when you create each instance of the other classes.
0
 
sjgreyAuthor Commented:
I have a Class_Initialize subroutine within the modules that use the clock but I don't see, to be able to pass it parameters.  Will I have to use a separate "Let" procedure with a separate line such as

Object.Clock = SimClock

followed by, within the object

Public Property Let Clock(SimClock as clsSimClock)
Set Clock = SimClock
End Property

to establish the connection to the clock or is there an easier way to include it when instantiating the modules that need the clock?
0
 
sjgreyAuthor Commented:
That worked thanks.  Code in the class required to use the clock as follows in case it is of interest to anyone else.

Private pClock As clsSimClock
...

Public Property Set SimClock(Clock As clsSimClock)

    Set pClock = Clock

End Property

Open in new window


And in the code that sets up the class instances

    Dim SimClock As clsSimClock
...
            Set Unit.SimClock = SimClock

Open in new window

0
All Courses

From novice to tech pro — start learning today.