Closures/Value capture: Difference between revisions
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=={{header|FreeBASIC}}==
FreeBASIC doesn't support closures or anonymous methods, as such. However, what we can do is to create an array of objects to capture their index and then call a method on those objects which squares the index. This approach is similar to how some other object oriented languages implement closures 'under the hood'.
<lang freebasic>' FB 1.05.0 Win64
Type Closure
Private:
index As Integer
Public:
Declare Constructor(index As Integer = 0)
Declare Function Square As Integer
End Type
Constructor Closure(index As Integer = 0)
This.index = index
End Constructor
Function Closure.Square As Integer
Return index * index
End Function
Dim a(1 To 10) As Closure
' create Closure objects which capture their index
For i As Integer = 1 To 10
a(i) = Closure(i)
Next
' call the Square method on all but the last object
For i As Integer = 1 to 9
Print a(i).Square
Next
Print
Print "Press any key to quit"
Sleep</lang>
{{out}}
<pre>
1
4
9
16
25
36
49
64
81
</pre>
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