diff options
Diffstat (limited to 'examples/ootest.tcl')
| -rw-r--r-- | examples/ootest.tcl | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/examples/ootest.tcl b/examples/ootest.tcl index d3d48c3..731e46a 100644 --- a/examples/ootest.tcl +++ b/examples/ootest.tcl @@ -13,6 +13,14 @@ puts "Account vars=[Account vars]" puts "Account methods=[Account methods]" puts "" +# Create a constructor. This does validation, but it could +# do other things +Account method constructor {} { + if {$balance < 0} { + error "Can't initialise account with a -ve balance" + } +} + # Now flesh out the class with some methods # Could use 'Account method' here instead Account method deposit {amount} { @@ -57,10 +65,17 @@ $a describe puts "" # Now create a new subclass +# Could change the initial balance here too class CreditAccount Account { limit -1000 - balance -20 } + +CreditAccount method constructor {} { + # Dummy constructor + # If desired, manually invoke the baseclass constructor + super constructor +} + # Override the 'withdraw' method to allow overdrawing CreditAccount method withdraw {amount} { if {$balance - $amount < $limit} {error "Sorry $name, that would exceed your credit limit of [expr -$limit]"} |