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Task/Function-composition/Phix/function-composition.phix

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+sequence ctable = {}
+
+function compose(integer f, integer g)
+    ctable = append(ctable,{f,g})
+    return length(ctable)
+end function
+
+function call_composite(integer f, atom x)
+integer g
+    {f,g} = ctable[f]
+    return call_func(f,{call_func(g,{x})})
+end function
+
+function plus1(atom x)
+    return x+1
+end function
+
+function halve(atom x)
+    return x/2
+end function
+
+constant m = compose(routine_id("halve"),routine_id("plus1"))
+
+?call_composite(m,1)    -- displays 1
+?call_composite(m,4)    -- displays 2.5