{ Type | Class | Union } typename

Declare Operator For ()
Declare Operator For ( [ ByRef | ByVal ] stp As typename )
...

End { Type | Class | Union }

For iterator [ As typename ] = start_value To end_value [ Step step_value ]

[ ...statements... ]

Next

typename
stp, step_value
iterator
end_value
start_value

Operator For, Operator Next and Operator Step can be overloaded in user-defined type definitions to allow objects of that type to be used as iterators and step values in For...Next loops.

Operator For is called immediately after copy constructing or assigning to the iterator object, and allows the object to perform any additional initialization needed in preparation for the loop.

The first version of Operator For is used if no step value is given in the For...Next statement. If a step value is given, the second version is used and is passed the step value.

See the Operator Step examples.

• Only available in the -lang fb dialect.
  
  

• Operator Next
  
• Operator Step
  
• For...Next