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Task/Generic-swap/FreeBASIC/generic-swap.freebasic

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+' FB 1.05.0
+#Macro Declare_Swap(T)
+Sub Swap_##T(ByRef t1 As T, ByRef t2 As T)
+  Dim temp As T = t2
+  t2 = t1
+  t1 = temp
+End Sub
+#EndMacro
+
+Dim As Integer i, j
+i = 1 : j = 2
+
+Declare_Swap(Integer) ' expands the macro
+Swap_Integer(i, j)
+Print i, j
+
+Dim As String s, t
+s = "Hello" : t = "World"
+
+Declare_Swap(String)
+Swap_String(s, t)
+Print s, t
+
+Print
+Print "Press any key to exit"
+Sleep